LIBRARY OF THE UNIVERSITY OF CALIFORNIA. GIKT OF Class THE UNIVERSITY OF CHICAGO FOCXDED BY JOHM D. BOCKEFEL' THE DECENNIAL PUBLICATIONS ME AS I RKS OF DOUBLE STARS BY SHERBURXE WESLEY BURXHAM THE DECENNIAL PUBLICATIONS FIRST SERIES Two volumes of REPOKTS and eight volumes of INVESTIGATIONS, the latter consisting of a collec- tion of articles representing the work of research of the several departments of the Univer- sity. Size, quarto. VOL, 1. The President's Report. A. Administration. II. The President's Report. B. Publications of the Members of the University. VOLUME TIT. PAKT!. Systematic Theology, Church History, Practical Theology. PART 2. Philosophy, Education. VOLCMT TV. ! Economy, Political Science, History, Sociology. VOLUME V. Semitic Languages and Literatures, Biblical and Patristic Greek, Comparative Religion. VOLUME VI. Greek Language and Literature, Latin Language and Literature. Sanskrit and Indo-European Comparative Philology, Classical Archaeology. VOH:ME VII. Romance Languages and Literatures, Germanic Languages and Literatures, English, Literature in English. VOLUME VIII. Astronomy and Astrophysics. VOLI-ME TX. Mathematics, Physios. Chemistry. Geology. Voi.r>n X. /oology, Anatomy, Physiology, Neurology, Botany, Pathology. Bacteriology. SECOND SERIES A series of volumes embodying original research, consisting of systematic treatises, unpublished documents, and the like. Size, octavo. THE UNIVERSITY OF CHICAGO POUNDED BY JOHN D. ROCKEFELLER THE DECENNIAL PUBLICATIONS MEASURES OF DOUBLE STARS WITH THE 40-INCH REFRACTOR OF THE YERKES OBSERVATORY IN 1900 AND 1901 BT SHERBURNE WESLEY BURNHAM >\ PROFESSOR OF PRACTICAL ASTROXOJCY AXD ASTRONOMER IX THE TEREES OBSERVATORY PRIKTED FROM VOLUME VIII *" CHICAGO THE UNIVERSITY OF CHICAGO PRESS 1902 Copyright 1903 BY THE UNIVERSITY OF CHICAGO MEASURES OF DOUBLE STARS WITH THE 40-INCH REFRACTOR OF THE YERKES OBSERVATORY IN 1900 AND 1901 S. W. BCBNHAM THE double-star measures recorded here were made principally in the years 1900 and 1901. The observations preceding this period were almost entirely of the /8 stars ; and the mean results have been incorporated in the "General Catalogue of 1290 Double Stars" discovered by the writer from 1871 to 1899, and issued in 1900 as Vol. I of the Publications of the Yerkes Observatory. The detailed measures have not been printed, but, as the results have been given in connection with all the measures of these stars, arranged in chronological order, I have not thought it worth while to give the separate observations. In making the working-list of objects for measurement, the purpose was to include no star likely to be observed elsewhere, and to confine it wholly to long-neglected and little-known pairs, and those which for the lack of sufficient measures, or the uncertainty of the early results, could not be classified as to motion or otherwise. These stars, so far as the early astronomers are concerned, come largely from the several catalogues of the two Herschels and South, with some of the rejected Struve pairs also catalogued and roughly measured by Herschel II. Many of these, and particularly those from Herschel I. and South, are wide pairs, and too widely separated to be considered by modern observers as double stars in the proper sense of the term ; and, whenever change has been found in this class of objects, it is very probable that it is due to the proper motion of one or the other of the components. In the other class, where the distances are less, the changes, if confirmed by later observations, may point to physical systems, though, of course, the orbital movement would of necessity be slow. It seemed very desirable that these stars, among the oldest known so far as the literature of the subject is concerned, and observed by the most eminent astronomers who have ever lived, should receive sufficient attention from modern observers to show whether or not in this long interval there has been any relative motion. In many instances the measures now made do not satisfactorily determine this, since the apparent change may be accounted for by errors in the single observations made when the pair was first catalogued, and another series of measures at some later time may be necessary. It will be seen that in many of these stars there are great apparent changes, and it is practically certain, after making all due allowance for the early observations, that many of these changes are real. The measures of Herschel II. consist usually of a single reading for the position-angle and an estimate of the distance. The angles are generally very accurate, so far as one can judge from the better-known class of stars catalogued by him; but the distances, and particularly those which are under 10", would seem to be very frequently underrated, so that many of the apparent changes in this respect will probably not prove to be real. The observations were all made seventy or eighty years ago, and, with few exceptions, these pairs have been entirely neglected since that time. A slow movement of any kind would make a decided change in the relation of the components after such an interval of time. Another set of measures twenty or thirty years hence will dispose of the question of motion and eliminate many of these objects with respect to any further attention. The neglected pairs of Herschel I. and South belong largely to the wider classes, and therefore were not incorporated by Struve in Mensurae Micrometricae. Some of the pairs of the first observer have not been observed at all since that time, the interval being about a century and a quarter. The measures of South were made about 1825, and the objects taken from his catalogue have either not been measured since at all, or the later measures indicate some change. Another class of stars selected for measurement has been taken from various star catalogues where MEASURES OF DOUBLE STARS the star was noted as double by the meridian observer. These catalogues include Weisse, Argelander, Harvard Zones, some of the A. G. catalogues, and others. These pairs have not been previously measured. Some of them are likely to prove to be physical pairs. Some of the neglected OS stars were put on the list, but on the appearance of Hussey's complete re-observation of all the Poulkowa stars (Publications of the Lick Observatory, Vol. V) further measures were unnecessary, and this part of the work was discontinued. The wide pairs noted by O2, which correspond to similar pairs given in Appendices I and II to the Mensurae Micrometricae, of which there are no measures since the observations of Dembowski, some twenty-five years ago, have been measured to ascertain whether or not there has been any change since that time. A further class of pairs has been taken from more modern works, which include some of the pairs recorded by the several observers at the Cincinnati and Harvard College Observatories, and others still more recently catalogued. Many of these were given only approximate places and a single measure for the relative position. In all cases the error of place has been corrected, and the object identified in the D. M. or some other star catalogue. In a few instances the pair could not be found at all after a careful search in the vicinity of the assigned place. The observing-list of stars selected in this way would obviously be a long one, and the work laid out is far from being finished. The observations which follow, amounting to about fifteen hundred measures, include only the pairs which have been measured on at least two nights. Those which have been measured once only must be given in a later series. A large number of pairs are still to be measured for the first time. The method of making the measures has been too often described to need repeating here, since it is practically the same with all observers who use the micrometer. Double distances have, of course, been taken, and a sufficient number of readings made, usually three to five, to give as good a mean as the observer can attain. From a large number of transits, arid measures of difference of declination of well-determined stars, by Professor Barnard and myself, the value of 9f666 for one revolution of the micrometer has been adopted. In the course of these observations a few new pairs have been picked up, which are given at the end of the other measures. These are numbered in continuation of my prior lists from 1291 to 1308 inclusive. The reason why this number of new pairs is not larger will be readily understood when it is explained that, in the first place, the finding of new pairs was no part of the work planned, and no time was spent in the examination of adjacent stars; and, in the second place, for all stars smaller than 7.5 magnitude, diagrams were carefully platted to scale from the D. M. catalogues, showing the place of the pair sought and all the other stars in the vicinity, down to the Argelander limit, within a radius of about one degree. This preparation was essential in the interest of saving time in finding the object, and for the purpose of properly identifying it. Hence, except in cases where the given place was erroneous, the proper star could be placed in the field at once without loss of time, and no attention given to the other stars in the neighborhood. With any other plan, doubtless, a large number of new pairs, of more or less apparent interest, would have been found, but necessarily it would have seriously interfered with the carrying out of the arranged program, which would require at least several years thoroughly to complete ; and it seemed much more important at this time to correct the descriptions and places of the stars recorded by some of the first observers, and get data for learning something of the movement of these long-neglected pairs. The old and well-known double-star systems are in no danger of being overlooked, and there has always been an unnecessary duplication of the measures of these pairs. The star-places given are for 1880. S. W. BUBNHAM I. S 3065 re/. S.D.(15)3. 8.6 R.A. =0" 1-51' Decl. = - 14 54' 1901.796 289? 2 .854 289.1 MEASURES OF KNOWN DOUBLE STABS .8.7 1901.82 289.1 No" other measures of this pair. 9:44 9.55 9.49 S 3064 rej. 7.2 ... 10.4 R.A. =0" 2 m 10 s Decl. = + 39 26' 1901.722 358? 1 .796 356.4 1901.76 357.2 23:91 23.80 23.85 The only other measures are by H, 351 ?1 : 20" (1830). p Cassiopeiae. 2 ... 15 R.A. = O h 2"" 1 43 s ) Decl. = +58 29' \ 1900.684 204?5 22?88 .725 204.0 22.44 1900.70 204.2 22.66 The only other measures of the Clark companion are my own in 1889. The principal star has a proper motion of 0'550 in 110?2. This movement, with the measures of 1889, gives the position of the small star for the date of the above measures, 204?8 : 22'28. It is therefore certain that the companion is fixed in space. R.A. = 0" 2 51 s / Decl. = +58 58' } 1901.818 145? 1 23:44 .835 144.6 23.26 1901.82 144.8 23.35 " Duplex '' in O.Arg. No other measures. These stars are D.M.(58)4 and 5. The A.G. positions give 143?6 : 2:592 (1873. 7). H 1001. D.M.(43)7. 8.5 ... 9.1 . = O h 2- 57 s ) 1. = + 44 3' \ R.A. =0" Decl. 1901.722 .758 1901.74 77?5 77.7 77.6 15:80 15.72 15.76 The R.A. in H is l m too large. He gives 84?5 : 13' . No other measures. H 1939. 8 ... 9.3 RA. Decl. = 0" 341 S I = + 10" 45' \ 1901.605 .742 161?2 161.3 34.'75 35.09 1901.67 161.2 34.92 The Decl. in H is 5' too small. By a single measure in 1877 I found 159?1 : 36 -'08. 2 3. Andromedae 51 R.A. =0" 3 m 49 5 Decl. = + 45 43' 1901.722 .758 1901.74 83? 4 83.4 83.4 4:87 4.79 4.83 H notes another small star, 133?0 : 4:57, and says: "Possibly the small star is a mere illusion." I could not see anything of it here, or attached to any star in the vicinity. No change in the S components. S 6 rej. D.M.(4")9. 8.9 . R.A. =0 h 4 1 " 6 s Decl. = + 4 13' 1901.605 192? 8 .742 192.7 1901.67 192.7 10.5 21:20 21.02 21.11 The only other measures are by the Harvard ob- servers, 193?2 : 22.'56 (1869.92) 1. H617. D.M.(0)9. 9.2. R.A. = O h 5 4 Decl. = + 36 1900.706 61?8 0.744 59.2 1.742 60.9 12.7 13:57 13.39 13.13 1901.06 60.6 13.36 H gives 55 : 6" : 9 ... 14, and says "a third 18m at 4" : 320 C suspected." I could not see any other companion. 6 MEASURES OF DOUBLE STARS H 618. D.M.(-0)17. 9.6 ... 9.6 R.A. = O h 7 '"22 s / Decl. = - 47' \ 1901.742 249?6 5?33 .854 71.4 5.16 The principal star has a very small proper motion, 0^057 in 236?0. Hdl7 R.A. =0"18 m 32 s ) Decl. = - 37' \ 1901.80 250.5 5.24 No other measures ; 250 : 2" (1820) H. H 1947. 7.3 ... 10.5 R.A. = O h 10 m 3 s ) Decl. = +42 58' \ 1901.818 75?6 9'14 .835 75.1 9.06 Described in the Harvard observations, sp : 10" : 8 ... 12. This star is not double, and no such pair found in the vicinity (1901.74). OS 10 rej. L 581. 6.3 ... 8.9 R.A. =0"21 m 16 s ) Decl. = + 15 22' \ 1901.742 . 237?6 100^55 ^^4. 9^8 rt inn OR 1901.82 75.3 9.10 .873 237.8 100.97 The principal star (Radcliffe 44) has a small proper motion (Hon. Not., LI, 398). 1879.40 74?6 9^36 2w OS W 2 0.264. 8.5... 8.5 R.A. =0 h ll m 10' ) Decl. = + 35 10' \ 1901.835 107?0 5. '34 .854 107.6 5.25 1901.82 237.8 100.83 The first measure of this distant star is : 1866.68 237?0 96^34 3n A The A.G. proper motion of the principal star is 0.'092 in 286?2. The above measures give 0-'133, so that the first is too small, or the other star has a movement of its own. H 322. 12 Ceti. 6.5 ... 11.7 1901.84 107.3 5.29 " Duplex 4" distance " in Weisse. The only meas- ure is : 1879.61 106?4 5^35 In Gin R.A. = O h 23 m 55 s ) Decl. = - 4 37' \ 1901.760 189? 4 9 .'70 .815 188.4 9.52 .818 188.8 9.40 .835 189.6 9:53 H 1951. S.D.(12)44. 8.6 ... 12.0 R.A. = 012 m 41 s ) Decl. = - 11 37' \ 1901.796 217?9 22'72 .854 217.1 23.03 1901.81 189.0 9.54 The only measures are : 1866.76 185?2 8^66 3n A 1880.23 187.0 8.63 3n ft 1901.82 217.5 22.87 The only complete measure preceding this is : 1877.95 216?6 24f09 In ft H 1953. i Ceti. 4 ... 12 R.A. = h 13 m 19 5 ) Decl. = - 9 30' \ The proper motion of A is practically zero. p 107 R.A. = O h 24 m 31 s ) Decl. = + 62 41 ' \ A and B 1900.706 354? 9 5-'71 .725 353.2 5.69 1900.666 17?0 63:00 668 17.1 62.75 1900.71 354.0 5.70 AandC 1900.66 17.0 62.87 The other measures are : 1900.706 336? 7 46 .'94 .725 336.7 46.62 1880.31 15?5 6K96 2n ft 1900.71 336.7 46.78 S. W. BURNHAM 1900.706 .725 1900.71 1900.706 .725 1900.71 1900.706 .725 A and D 146? 5 146.6 146.6 A and E 170?9 170.8 170.9 AandF 114?1 113.7 50--28 50.36 50.32 113 '59 113.51 113.55 150'50 150.48 1900.71 113.9 150.49 E and e 1900.725 139?1 8^61 16m (See Popular Astronomy for December, 1900.) H 1982. 52 Piscium. 6 R.A. = h 26 m 18 s Decl. = + 19 38' 1900.684 304?2 .687 304.1 1900.68 304.2 The only measures are : 1830 + 309?6 25 ' 1879.99 305.7 38.30 12 4T08 41.28 41.18 In 3n H The distance would seem to be increasing. The proper motion is very small, 0'012 in 109?3. H 1038. 10.7 . . . 10.8 R.A. =0"29 m 19 s Decl. - +63 4' 1901.722 111?0 3-77 .818 109.3 3.81 s / ' \ 1901.77 110.1 3.79 The only position is by H, 97?0 : !' (1828); "in contact with 160; just separated with 240." I looked this up in 1876 with the 6-inch, and estimated the distance as fully 2". Not in D.M. H 1040. 10.9 . . . 11.2 R.A. =0" SI" 37 s ) Decl. = + 65 7' J 1901.722 .796 355? 4 353.3 1901.76 354.3 Hgives356?4:2' (1830). 4f88 5.18 5.03 H 3380. R.A. =0" 33- 35 s Decl. = 17 23 s ) ' ) H gives 96?2 : 30'=h : 7| . . . 13 (1836.78). There is no bright star in this place, and I could not find any such pair in the vicinity. It may be identical with H 2067, which is l h more R.A. The descrip- tions agree. D.M. ( 0)75. 7.6 ... 11.5 R.A. =0 h 31-56 s Decl. = - 1" 10' 1901.703 .873 1901.79 307U 306.5 306.8 30'46 30.50 30.48 This was measured for S 53 rej. No other obser- vations. The principal star is 6.8m in D.M., and has a proper motion of 0-087 in 253?4. S 53 rej. 8.0 ... 8.7 s ) ' \ RA. =0 h 37 m 18 s Decl. = - 1 32 1901.735 .854 338?9 338.3 1901.76 338.6 The earliest measures are : 1891.81 334?6 26 M7 27^79 27.61 27.70 3n Engelhardt This star has a considerable proper motion ; 0'415 in 216?6 (Porter); 0-'301 in 228?4 (Nico. A.G.). The smaller star is probably not moving with the other. H 1051. 11 ... 13.2 R.A. =0 h 38 n 'll s Decl. = + 24= 3' 1900.706 221?0 6'52 .780 221.2 6.88 1900.74 221.1 6.70 The distance seems to be greatly overestimated by H, as in nearly every instance of this kind. He gives 275?0 : !' : 10 . . . 14 (1828). It is near D.M. (23)98. H 626. D.M.(30)110. 8.5 ... 11 ... 12.5 RA. =0 h 39 ra 7 s Decl. = + 31 A and B 7 s ) 1 \ 1901.703 .758 1901.73 345? 9 346.4 346.1 32^16 32.46 32.31 MEASUEES OF DOUBLE STARS 1901.703 .758 1901.73 BandC 105? 8 107.1 106.4 10-54 10.16 10.35 H gives 330 : 20" : 9 . . . 14; " large star, very red." The third star was not seen by him. A is only yellowish at most. H 1054. D.M.(59)125. 8.2 ... 10.5 R.A. =0" 42- 31 s ( Decl. = + 60" 6' \ 1901.796 .799 1901.80 182? 5 181.6 182.0 8^75 8.58 8.66 H gives 176?0 : 5" : 9 . . . 13 (1828). Hd35. S.D.(2)110. 8.7 R.A. =0 h 42 m 28 s ) Decl. = - 2 25' \ 1901.835 37? 1 .873 37.0 9.3 6^86 6.99 1901.85 37.0 6.92 From the Harvard list. The only measure is : 1867.89 37?4 l'.(A In Hd Hd 36 R.A. = Decl. = - 21 -I This is in the Harvard list as O.Arg.S.439, with the correct place as given above. The description is 16?6 : 21' : 7 ... (1868.82). This star is not a double of any kind, nor is there any pair as described in the vicinity. The nearest pair is 0301, but this does not correspond in any respect to measures or magni- tude. OS(App)9. 8... 8.2 R.A. =0" 43 -21 s Decl. = + 29 48' 1901.703 236?8 96^72 .799 236.5 96.10 96.41 1901.75 236.6 The principal star has a proper motion of 0'263 in 100?3 from meridian positions. The measures of J in 1875 compared with the foregoing give 0'217 in 92? 1. There is a 12m star nearly midway, from A 252?7 and from B 42?5. H628. 7.7... 11.5 R.A. = 045 m 25 s ) Decl. = + 33 14' \ 1901.703 68?5 42^73 .796 68.8 42.51 .799 69.0 42.53 68.8 42.59 1901.76 H gives 65 : 35" d= : 7 . . . 16 ; " large star red." The principal star is not red yellowish at most. Weisse R.A. =0 h 45 m 56 s Decl. = + 25 8' "Duplex" in Weisse. Not double except as a wide pair in the finder. There are three observations in Weisse differing slightly in place. O.Arg.N.901. 8.5 .:. 8.9 R.A. =0"50 m 3 s Decl. = +59 41' 1901.796 .799 1901.79 201?9 202.8 202.3 20.'82 20.64 20.73 "Duplex" in O.Arg. The only measures are 203?2 : 21 '24 (1892.77) Espin. The components are D.M. (59)150 and 149. \L Andromedae. 4 ... 13.5 . . . 13.2 R.A. = O h 50 m 6 s ) Decl. = +37 51' \ AandC(=H1057) 1901.799 .818 1901.80 1901.818 .835 1901.82 122? 2 122.3 122.2 A and B 310? 8 311.4 36 .'87 36.87 36.87 39 .'82 39.56 311.1 39.69 The large star has a proper motion of 0'173 in 73?2. 1878.67 110? 9 38 .'37 3n ft 1878.67 314.4 37.27 3n ft 8 S. W. BUBNHAM 9 Winnecke. D.M.(8)137. 9 ... 9.2 RA. = h 51 m 46 s > Decl. = + 8' 38' \ 1901.703 128?3 5-'40 .760 130.1 5.41 H 1079. 44 Ceti. 6 ... 10.5 RA. =l h !8 m s ) Decl. = - 8 ? 38' \ 1900.725 298?9 80f37 .744 298.5 80.37 1901.73 129.2 5.40 The only other measures are : 1863.86 130?2 5^32 2n Wn H2026. D.M.(4)204. 8.6 . . . 11 RA. = 1" 5">42 ) Decl. = + 4 15' J 1900.706 306?6 lO-'ll .742 306.0 10.34 .782 305.6 10.33 1900.73 298.7 80.37 The only observations are : 300?5 60' 1828 In H 299.6 76.40 1877.86 In ft The principal star has a proper motion of 0'134 in 115?4, which accounts for the change in distance. H 638. 11^ ... 115 RA. =1"19' 5 s / DecL = - 47' ) 1901.760 271?8 9-52 .876 271.3 9.30 1900.74 306.1 10.26 H gives 303?3 : 10' : 10 ... 15 (1830). The principal star has a considerable proper motion, 0-'214 in 215?1 (Porter) and 0.'28 in 230?8 (Boss). This would seem to be common to both stars. S 103. S.D.(2)192. 8.4 ... 9.7 RA. = I h 10">33' ) Decl. = - 2 10' J 1901.703 246? 5 5 .'49 .796 246.7 5.34 1901.82 271.5 9.41 In the field nf S.D.(4 D )203. The only observation is by H, 273?0 : 2'-3' (1820). H 640. S.D.(4 C )230. 9^ ... 95 RA. =l h 27 m 27 s > Decl. = - 4' 8' \ 1901.760 290? 1 5- '33 .876 291.3 5.29 1901.75 246.6 5.41 No recent measures, but probably unchanged. Some uncertainty in place heretofore. H 5453. D.M.( 1)167. 83 ... 9.9 RA. =1" 12-" 29 s > Decl. = - 1 29' \ 1901.703 208?3 27 '56 .796 208.5 27.35 1901.81 290.7 5.31 No other measures. T Andromedae. 5 ... 10.2 RA. =1"33-30 I t Decl. = + 39 58' \ 1900.684 329?0 52-'53 .706 329.1 52.73 1901.75 208.4 27.45 The positions are estimated by H, 210 : 30'. Engelhardt gives 209^5 : 27 .'95 (1891.81) 2. The principal star has a proper motion of 0'499 in 121 ?4, and the small star seems to be moving with it. Barnard. D.M.(3 )184. 8.5 ... 11 R.A. = I h 12 m 40 s ) Decl. = +4 1' ) 1900.742 12?0 l-'4o Discovered by Barnard. No change since his measures of 1894. 1900.69 329.0 52.63 The only other observations are 3284 : 52 '35 (1880.68) 2 ft. The proper motion of this star is small, 0^019 in 37?4. H 2067. L 3056. 7^ ... 11.1. RA. =l h 33-33 5 ? Decl. = - 18' 24' \ 1901.760 91?3 34-'07 .87.6 91.9 33.66 1901.81 91.6 33.86 9 10 MEASURES OF DOUBLE STARS Probably without change. The distance in H of 5" may be a misprint for 25". In my measure of 1878 the distance is printed 23 '90 instead of 33 "90. The measures of Wilson (Gin 10 ) belong to H 3455, which is 4m / this pan:. H1088. L3044. 7.0 R.A. =l"34 m 20 s Decl. = + 58 1 ' 1900.780 168? 1901.796 167.2 .9.5 1901.79 167.6 H gives 164?5: 15" (1828). H 3455. 9.1 ... 9.2 19^52 19.41 19.46 R.A. = I h 37" Decl. = - 18 31 s 13' 1901.760 .876 1901.81 74? 5 73*. 6 74.0 23^56 23.73 23.64 The components are S.D.(18)291 and 292. The only measures are : 1882.70 73?2 23^90 In Wilson S 168. 8.5 ... 10 R.A. = l43 m 6 Decl. = + 66 9 1900.725 224?2 If 73 1901.796 222.6 1.87 1901.76 223.4 No measures since A in 1867. 1.80 No evidence of change. H could not see it, and I failed with the 6-inch 1874. Hd 54. D.M.(1)335. 8.6 ... 11.2 . . . 11.2 R.A. = lM4'"26s ) Decl. = + 1 55' \ A and B 1900.706 .742 1900.72 1900.706 .742 1900.72 116.7 116.9 AandC 211?8 211.1 4^48 4.18 4.33 15^67 15.42 211.4 15.54 The only other measures are by the Harvard observers on one night in 1867. TEey give for AC, 213?4 : 14^26 (1867.96). S 188 rej. 8.8 ... 9.4 R.A. = I"50 m 47 s ) Decl. = + 62 20' \ 1901.722 238? 4 32^54 .796 238.4 32.62 1901.76 238.4 32.68 H describes the components " very red : fine green." The colors are less prominent. H 1100. B.A.C. 588. 6.3 ... 10.6 R.A. = l h 50 -a 47 s Decl. = + 64 3' 1901.722 310?4 38 .'81 .796 310.1 38.83 1901.76 H gives 310?4:30" error. 310.2 38.82 His declination is 20' in H 3476. L 3731. 6.2 ... 9.8 R.A. = I54 m 29 s Decl. = - 9 6' 1900.706 .725 .742 1900.72 193? 193.6 192.5 193.0 62^05 61.08 61.77 61.63 H gives 183?7 : 60" . His declination is ls of the real place. The principal star is 5.8m in S.D. H 647. D.M.(6")319. 8.8 ... 9.3 R.A. = 156"'16 S Decl. - + 7 6' 1900.706 35? 6 .742 34.3 .782 35.1 26 '71 26.43 26.60 1900.74 35.0 26.58 Positions estimated by H ; " large star deep blood red a very intense and remarkable color; small star green." The colors are very marked. S207. D.M.(16)233. 9 R.A. = I"56 m 45 Decl. = + 17 4 1901.873 186? 7 .876 185.0 10 11. '88 11.96 1901.87 185.8 11.92 No recent measures, but without change. 10 S. W. BUBNHAM 11 H 2104. D.M.(52)500, 501. 8.7 . . . 8.8 RA. = 1"57"> 9 s J Decl. = + 52' 27' \ 1901.722 167?2 30^27 .758 347.0 30.12 S219. 8.2... 8.7 RA. =2" 3 11 s ) Decl. =+32' 48' \ 1900.742 183?6 ll-'63 1901.586 183.9 11.49 1901.74 167.1 30.19 .818 182.3 11.50 Both R.A. and Decl. erroneous in H. He gives 166?4 : 25' . Identified as above. 9 V. 102. 61 Ceti. 6 ... 9 RA. = l"57 m 39 s ) Decl. = - 55' \ 1900.706 193? 7 43507 .725 194.2 43.11 1901.38 183.3 11.54 No recent measures ; apparently fixed. S226. 8.4... 10.2 RA. =2" 5- 27* ) Decl. = + 23 24' \ 1900.706 249? 5 2-'40 .742 246.2 2.13 1901.818 241.8 2.13 RSFi 944 S 1 QC; IQfY^ 71 1CX1 rt <1A HQ H in 1873 made two measures of the distance, 34 '50 and 37 '88. The only other measures are my own, 193?3 : 42^71 (1877.86). Bossert gives the proper motion 0-144 in 123?7. S 211 rej. RA. =i"58 ) Decl. = - 6 0' \ H could not find anv pair in or near this place 1901.27 245.6 2.15 No measures since J ; little if any change. The Berlin A.G. gives the proper motion of A, 0'187 in 126?0, and the small star is therefore moving with it. H 1115. 10 Trianguli. 6 ... 12 RA. =2 h ll59 s ) Decl. = + 28 5' \ 1900.742 206?2 57^14 .744 204.5 57.04 2 gave this as Class IV, 8 ... 11. There is no star in the assumed place. There is a 7m star about 15 's with a distant 9Jm star in the field, which may be the one in question. S213. D.M.(50 >459. 8.4 ... 8.6 ... 12.5 R.A. =2" 1-17* ) Decl. = + 50" 30' \ . 1900.74 205.3 57.09 H gives 206?8:50', and calls the small star 18m. No other measures. S 247 rej. D.M.(3)320. 9.0 . . . 9.0 RA. =2" 12- 7 s ) Decl. = + 3 37' i 1901.703 211?3 7. '61 .876 212.1 7.48 A and B 1900.782 320?6 1T96 1901.722 323.6 1.81 1901.79 211.7 7.54 The only measure is : 1879.66 32?2 7 '39 In Cin 1901.25 321.8 1.88 A and C 1900.782 62? 8 7' 19 1901.722 59.7 6.88 H2134 RA. =2" 16 0' I Decl. = 11* 10' f 1901.25 61.2 7.03 No recent measures ; no sensible change. The third star has not been seen before. Described by H, 265?2 : 9' : 9 . . . 10.11. There is no pair of this description in or near this place. It is certainly identical with H 2140, which is about 5m/. 11 12 MEASURES OF DOUBLE STARS H 649. 12.5 ... 13 R.A. = 2 h 17 m 4 s > Decl. = +9 4' \ AandC 1900.742 242?8 14f26 1901.760 243.4 14.12 1901.799 127? 5 9^10 H has 120 :li' : 15 . . . 16. H2140. S.D.(11)459. 8.5 . . . 10 R.A. = 2 h 19 m 59 s ) Decl. = - 11 10' J 1901.703 263? 4 10r70 .742 263.1 10.51 1901.25 243.1 14.19 H gives 19?6 : 10" and 299 : 12" . O.Arg.N. 3145. 8.4 ... 8.4 R.A. =2"38 m 46' ) Decl. = + 49 37' \ 1901.589 143?0 3^08 .758 146.5 3.08 1901.72 263.2 10.60 In H, "R.A. conjectural." Identified as above. Identical with H 2134, for which H gives 265?2 : 9" : 9 . . . 10-11. The R.A. of that star is also in error. OS(App)27. 7.5... 8.5 R.A. = 2" 20 19 s ) Decl. = + 10 2' \ 1900.706 31? 8 73^67 .725 31.9 73.79 1901.67 144.7 3.08 "Duplex" in O.Arg.N. It is Hussey 204. He gives 143?4 : 3 '17 (1900.87) 3n. No other measures. There is a closer pair a little following which I noted many years ago, and in this connection measured it ; 155?5 : 1 ^42 (1901.67) 2n. This is Hussey 205. It is 57 s / the other pair, and 3's. T Persei R.A. = 2 h 45 m 45' ) 1900.71 31.8 73.73 The only other measures are by ^, 31?2 : 73'96 (1875.42). Hd Zones Tt A 2* 1 29 m s ) Decl. = + 52 16' \ A and B 1900.684 106?3 50-'50 .687 106.7 51.30 .725 107.2 51.09 .742 106.3 50.52 Decl. = + 37' [ In the Harvard Zones an 8m star noted as "double." The place is that of the 9m star D.M.(0 C ) 431, but this is not a double of any kind. 2 274 is 4"' p, and possibly the note has reference to that pair. O.Arg.N. 2946 R.A. = 2 h 29 m 29 s ) Decl. = + 49 44' \ " Duplex " in O.Arg. Not double ; there is a 10m star about 53" distant. I failed to find it in 1875. H 3518. O.Arg.S. 1715. 8.6 ... 10.5 . . . 10.6 R.A. = 2" 33 38 s ) Decl. = - 28 41' $ 1900.71 106.6 50.85 BandC 1900.742 81?7 4^58 The faint star B 12m was first noted by Edgecomb, and in measuring that with the 18|-inch the 13m star C was added. My measures of AB are 106?4 : 50^67 (1878.46) 2n. There is a 14m star from A 337?3 : 42^46 (1900.74) In. S 324 rej. D.M.(46)658. 6.7' . . . 12.2 R.A. = 248 m 27 s ) Decl. = +46 41' \ 1900.687 203?4 24^94 .725 203.2 25.10 .782 203.5 24.81 A and B 1900.742 15?2 13^29 1901.760 15.5 13.87 1900.73 203.4 24.95 H gives 191?4 : 12" for AB, and 342?4 : 8" for AC. I could see only the star measured, which is B 1901.25 15.3 13.58 of H. This was rejected by 2 as a close pair. 12 S. W. BURNHAM 13 H 3543. Cord.D.M.(29')1096. 10 ... 105 ... 12 RA. = 2" 52= 30') Decl. = - 29 28' J A and B 1901.876 264?2 9-89 $V. 117 = 2359 rej. 7.5 . . . 8.5 RA. =3" 4' 17 s ) Decl. = +21 58' \ 1900.725 320?5 33'39 .744 320.2 32.59 A and C 1901.876 69?5 14f39 No measures ; described in H, " Triple ; Cl. I and II." S 334 RA. =2"53- I s ) Decl. = + 6 10' j 1900.666 316?2 L'45 .668 317.6 1.36 1900.73 320.3 32.99 The only other measures are by H ; 317?5 : 34^80 (1783.65) In. The principal star is D.M.(21 )418. There is a nearer companion, 13m, 267 ?0 : 14 '69 (1900.72) 1. H 3557. L 6037. 8 ... 10.9 RA. = 3" 9= 12 s ) Decl. = - 14 53' \ 1900.706 2?4 27T13 1900.67 316.9 1.40 .742 2.2 26.77 H 2170. -y Persei. - ... 11.2 RA. =2" 56" 6 s > DecL = + 53 2 \ 1900.684 324?7 57-'56 .725 325.0 57.43 .782 324.9 57.32 1900.72 2.3 26.95 There is an error of 1 in the Decl. of H. The only observations are : 1835.90 9?9 20' In H 1880.27 5.3 27.13 3 ft SI71 1900.73 324.9 57.44 H gave the angle 224?9, probably an error of 100. The only measures are 323?7 : 57 .'72 (1879.55) 2n ft. RA. =3" 10- 23 s ) Decl. = + 46 35' \ 1900.687 81?7 3-'56 .782 82.8 3.14 1901.589 81.1 3.51 O.Arg.N. 3418. 9.0 ... 9.0 RA. = 2 h 5734 5 ( DecL =+52' 35' \ 1901.835 90? 1 4.'09 .854 90.0 4.19 1900.76 81.9 3.40 From the measures of J the angle appeared to be increasing. 1831.20 74? 7 3.'35 3n S 1867.45 81.7 3.32 3 J 1901.84 90.1 4.14 ' Duplex " in O.Arg. The only measures are : 1900.06 90?2 4^50 2 Espin S 353 rej. D.M.(17 = )494. 9.6 ... 11.0 R.A. = 3 h O m 47 s \ ' Decl. = + 17 25' \ 1901 720 59 2 10 '70 It would now appear that S's angle was too small, and that the stars are really fixed. H 3570. 7 . . 12 RA. =3"16>18*) Decl. = - 20 45' i 1900.706 256? 1 33-'89 .742 256.0 34.21 .799 58.0 10.63 1900.72 256.0 34.05 1901.76 58.6 10.66 No other observations except angle of 56?4 by H. No measures in H ; described as " triple or quad- ruple." No nearer companion than that measured, but other small stars in the field more distant. 13 14 MEASURES OF DOUBLE STARS H 2187. S.D.(11)652. 8 ... 10.7 R.A. = 3 h 17 m 32 s ) Decl. = - 11 47' \ 1901.703 240? 7 56 ^(M .742 240.2 56.00 S 416 rej. D.M.(19)556. 8.8 ... 9.7 R.A. =3 h 28 m 2 s ) Decl. = + 19 24' \ 1901.720 56? 6 26^54 .742 56.5 26.30 1901.72 240.4 56.02 In one observation H gives for the angle 239 5 (1830), and later 325?3 (1835.9). There is probably an error of 90 in the last. This pair appears to be S 387 rej. Hussey 20 is about l nl 40" p, which was measured once, 235?4 : 0^24 (1901.74). Nova Persei R.A. =3" 23 8' ) Decl. = + 43' 30' \ Two of the small stars in the field were measured, 1901.73 56.5 26.42 The principal star is catalogued as red. There is a 11.5m star, 292?9 : 22 '61, previously noted by Espin. S 457. D.M.(22)576 R.A. =3" 43"- 15 s ) Decl. = + 22 19' \ A and B 1901.815 99? 5 1^14 .818 102.0 1.19 and then the work discontinued, as it appeared that Aitkin had carefully measured them all. 1901.167 63? 4 158^44 .529 63.0 158.41 1901.81 100.7 1.16 A and C = 12.6m 1901.815 340? 5 18^15 ft1Q QQ7 1 1ft 9J 1901 35 63 2 158 42 1901.167 116?7 102^38 .529 116.4 101.95 1901.81 338.8 18.20 This was observed for the distant star which has 1901.35 116.5 102.16 t ? IV. 89. L6436. 8.1 ...9.5 R.A. = 3 h 23 m 35 s ) Decl. = + 19 41' \ 1901.742 147? 1 20^35 .796 146.9 20.27 not been measured before. 2 mentions it as 347 : 32'. There is no change in the close pair. H 666. L 7069. 6.5 ... 12.7 R.A. =3 h 43"'15 s ) Decl. = + 9 3' \ 1900.684 19?2 30^72 1901.77 147.0 20.31 .687 18. o oU.85 Porter gives the proper motion of A, 0'203 in 108?0. The components seem to be moving together. 1783.73 152?0 20^05 In H 1879.66 147.3 20.40 In Cm S 417 rej. S.D.(3)572. 8.5 ... 9.6 R.A. = 3"27">27 S ) Decl. = - 2 57' \ 1900.68 18.7 30.78 No other measures. H gives 25 : 25" 6 . . . 17-18. H 667. 10.5 . . . 12.7 R.A. =3" 44 "'15' ) Decl. = - 33' J 1901.703 89? 7 12^64 .758 91.1 12.38 1901.703 179 5 25-78 .742 179.8 25.78 1901.73 90.4 12.52 1901.72 179.6 25.78 The only other position is 178?3 : 25" (1830) H. H gives 90" : 4"-5" AB, and 300 : 15" AC, with magnitudes 9, 12, and 18. I did not see the third star. Not in S.D. 14 S. W. BUBNHAM 15 H668. D.M.(-0)608. 8.5 ... 10.5 1901.854 357.2 58.96 RA. = 3 h 44 m 44 s ) Decl. =,- 0' 32' ( 1901.703 299?0 2T67 .758 298.1 21.23 1901.07 357.2 59.02 The only measures are by J in 1875. There is no change. 1901.73 298.5 21.50, Only H, 315- : 18' : 8 . . . 12. H3601. Cord.D.M.(23')1600. 12 . . . 9.5 RJL -3 h 46 m 31' ) H 3608. -y Eridani. 3} ... 13.2 RA, = 3 h 52>24 s ) Decl. = - 13 51' \ 1900.706 241?7 52-'68 .742 241.5 52.80 Decl. = - 23 18' \ 1901.760 300?4 10^62 .796 299.6 10.54 1900.72 241.6 52.74 The only other complete measures are my own, 238?4 : 51 -'93 (1877.88) 2n. The change in angle is 1901.78 300.0 10.58 H found 303?5 : 15' : 8J . . . 10. No. 33 of the Lowell Catalogue could not be found by Cogshall. It is evidently identical with H 3601, See having an error of 1 in his Decl. His measures were 299?2 : 10-'73:7 ...10.8(1897.72). S 462. i.ti . . . 10 RA. = 3" 46- 42') DecL = + 52 1' J 1901.720 317?7 8^20 .742 320.7 8.03 due to the proper motion of A, 0'114 in 158?3. o. N. 93 RA. =3"57' ) Decl. =+23 6'iJ No measures in Tf. ; given as Class II ; " place extremely precarious." The place agrees with D.M. (22*)626, but that is not double, and has no faint star near it. The pair in question is probably identical with 2 479. 1901.73 319.2 8.11 No recent measures, but unchanged. Not in D.M., but near D.M.(51=)804. 43 Persei S 440 ~ Tl V 41 H 2220. D.M.(56)885. 8 ... 11.5 RA. =3 h 59 m 49' ) Decl. = -f 56 7' \ 1900.744 296?6 25^63 .763 296.5 25.97 RA. =3 h 47-41 s ) Decl. = + 50 21' \ 1901.720 30? 4 75 .'47 .742 29.9 75.27 .758 30.1 75.36 1900.75 296.5 25.80 H gives 296?4 : 14' : 9 . . . 14 (1830). S 492 rej. 6.6 ... 10 ... 10 1901.74 30.1 75.37 The principal star has a proper motion of 0'155 in 147 '6, which also belongs to the 9.5 companion. 1863.07 29?7 Io'l5 4 OS 1888.19 30.0 75.34 2n Engelhardt RA. = 4" O m 6 s t Decl. = + 41 10' \ AandB 1900.687 202?5 94 -'47 .744 202.2 94.31 There is a 12.5m star nearer than this in 279. OS (App) 41. 7 ... 8.5 RA. =3 h 48' 6 s > Decl. + 4= 49 \ 1900.71 202.3 94.39 BandC 1900.687 135? 7 5 '47 .744 135.7 5.74 1900.684 357?0 58-'72 .687 357.3 59.37 1900.71 135.7 5.60 In 2 Classes I and VI. No other measures. 15 16 MEASUEES OF DOUBLE STABS Hd 66. S.D.(16)783. 9.6 ... 9.6 R.A. =4" 1">32' ) Decl. = - 16 10' J 1901.760 83? 8 17? 73 .796 83.1 17.75 02 (App) 49. 7.5 ... 7.5 R.A. = 4 h 12 m 41 s ) Decl. = + 1 29' \ 1901.742 144?6 102^80 .758 144.8 102.79 No and 1901.78 83.4 17.74 Given in the Harvard Annals with rough place, and 261?7 : 18 '52 : 9.3 ... 9.5 (1868.48) 3n. There is a 15m star nearer A, 263?4 : 5?68 (1901.79) In. OS 73. (i Persei R.A. = 4" 6 m 5 s | Decl. = + 48 6' \ A and B 1901.720 349? 8 14^52 .722 348.5 14.24 1901.75 144.7 102.79 Fixed; A gives 144?9: 102^94 (1875.33) 3n. other measures. These stars are Lalande 8090 8093. S 537. 8.5 ... 9.7 R.A. =4>>16 m 21 5 ) Decl. = - 10 14' J 1900.706 341?5 16^36 .742 341.6 16.49 1900.72 341.5 16.42 Distance and angle slowly increasing. 1832.39 334?0 14?99 4?i 2 1867.10 336.9 15.28 3n A 1891.86 340.4 15.98 In ft P402 R.A. =4" 17 3= \ Decl. = 1 S3' \ 1901.760 75?3 7^53 .796 73.7 7.52 1901.72 . 349.1 14.38 A and C (= H VI 20 = Sh 364) 1901.720 231? 9 84^02 .722 231.6 84.30 1901.72 231.7 84.16 No change in B. For AC Sh found 231?7 : 91-56 (1822.85) 2n. There is a 12.8m star nearer than C, 124?2 : 5(K36 (1901.72) In. H 673. D.M.(30)641. 9.2 ... 9.6 R.A. = 4" 9 25 s > Decl. = + 30 30' \ 1901.799 195? 5 2K40 .818 195.8 21.09 1901.78 74.5 7.52 This was put on the list in order to observe a third faint star noted by Cogshall at 110 : 7 '8, referred to in my General Catalogue. I found a 14m star 111?1 : 29'0. Since then I have learned from him that there was an error in transcribing the dis- tance, which was really 29", as I found it. S 530. D.M.(53)769 R.A. =4" 17'" 5 s ) Decl. = +53 13' \ A and B 1901.720 200? 5 14fl2 .722 200.7 14.19 .742 199.2 14.06 1901.81 195.6 21.19 H gives 210 : 18' : 7 ... 10. I found many years ago that there was an error in H's magnitude of A. This is given as 9.2 in D.M. S 519 rej. D.M.(50)976. 7.7 ... 95 R.A. = 4"ll m 52 s ) Decl. = +50 5' \ 1900.744 346?4 18^29 .763 345.8 17.98 1901.73 200.1 14.12 AandC 1901.742 279? 6 36^81 .758 280.3 36.83 1900.75 346.1 18.13 Given as Class IV in 2. The only other measures are by Espin, 346?8 : 18fBO (1892.%) 2n. 1901.75 279.9 36.82 16 S. W. BUKNHAM 17 C and D (new). 11.8 ... 12.0 1901.742 43?2 1'39 .758 44.4 1.55 57 Persei. Sh 44 = Jf VI. 99 R.A. = 424 m 58 s ) Decl. = + 42 48' ) 1901.75 43.8 1.47 No other measures of C, but it was noted by H in his Fifth Catalogue. This star I found to be a 1900.687 198? 8 115^38 .744 198.4 114.83 .763 198.6 115.46 rather difficult pair. The only measures of AB since S are by Ma and J. There is no change. H 342 = ? IV. 117 = S 539 rej. 8.2 ... 10.2 . . . 12.5 R.A. = 4" 17'" 19 s { Decl. = - 5 17' J A and B 1901.706 234?8 17?69 .742 235.2 17.35 1900.73 198.6 115.22 The change is due to proper motion, probably of the smaller star. This is given in the A.G. as 0'076 in 157?7. 1821.91 198?9 110^19 In Sh 1875.11 198.9 113.68 2n A This change in distance corresponds to the move- ment as given of B. 1901.72 235.0 17.52 AandC 1901.706 82? 5 28f27 .742 81.8 28.18 H 3653. O.Arg.S. 3129 and 3130. 8.3 ... 8.5 R.A. =4" 25- 7 s ) Decl. = - 16 43' ( 1900.742 156?3 42'58 1901.72 82.1 28.22 1901.758 157.4 42.42 H gave 238?2 : 19-53 (1783.13) In. No other measures since, except my own in 1877, which show no change as compared with the above. S 541 rej. 9.2 ... 9.3 R.A. = 4 h 18-14 s ) Decl. = + 21 58' \ 1900.725 331? 8 5^22 .744 328.3 5.83 .780 329.5 5.37 1901.75 156.8 42.50 The only other measures are 148?5 : 40' (1835.9) H. The O.Arg. places give 155?9 : 48^87 (1850). Hd Zones. 10.7 ... 12 R.A. =4"26 m ll') Decl. = + 1 2' \ 1900.742 235?8 1^93 1901.796 239.2 2.42 1900.75 329.9 5.47 This is the faint pair between ' and Decl. = - 1 40' J 1901.758 43? 9 2. '04 .796 44.5 1.98 1901.77 237.5 2.17 Marked " elongated " in the Harvard Zones. No other observations. 8 451 = OS (App) 51. 75 ... 7.7 R.A. =4 h 27 m 25 s ) Decl. = +47 T\ 1900.687 198?4 58^68 .744 198.1 58.62 1901.78 44.2 2.01 The change in angle is about 60 since 1831. A comparison of these measures with 2's gives OT052 in the direction of 316?1 for the proper motion of A. 1900.71 198.2 58.65 Probably unchanged. 1875.13 197?4 59^27 2n J 1875.3 198.4 59.44 A.G. 17 18 MEASURES OF DOUBLE STARS H 344. D.M.(33)883. 8.4 ... 11 R.A. = 4 h 28 m 26 s ) Decl. = +33 41' \ 1900.744 102?0 11^20 .780 102.4 11.14 1900.76 102.2 11.17 The only observations are by H, 95 : 10" : 10 .14. There is a 14m star 82?2 : 17 '5. S565 R.A. =4" 29 42 s Decl. = + 41 53' 1900.780 174? 3 .782 173.3 1900.78 173.8 If 63 1.48 1.55 Probably fixed. Measured in looking for the Weisse pair given below. P 1043. 3 Camelopardali R.A. =4"30 m 28 s ) Decl. = +52 50' \ 1900.687 .780 .782 1901.796 .815 .818 1901.28 299? 1 295.8 292.6 294.3 297.2 295.2 295.7 3^66 3.73 3.74 3.55 3.88 3.83 3.73 Weisse IV. 647. 9 ... 9.1 R.A. =4 h 31 m 42 s Decl. = + 42 6' 1901.720 110? 3 2^46 .722 113.8 2.44 1901.72 112.0 2.45 Weisse IV. 643 is noted "duplex 3" " in that cata- logue. That star is not double, and the note doubt- less belongs to the one given here, which is about 5's. No other measures. H 346 B.A.C 1444. 6.1 ... 11.0 R.A. = 433 m 49 s ) Decl. = +28 23' \ 1901.742 .758 1901.75 54? 5 54.7 54.6 43f37 43.27 43.32 No other measures ; only estimates by H. S 579. 8.6 ... 9.7 R.A. = 4 h 34 m 32 s ) Decl. = +22 30' J 1901.758 34? 5 .799 34.7 1901.78 34.6 16^31 16.43 16.37 No recent measures. No material change. S 455. r Tauri R.A. = 4 h 35 ra 2 Decl. = + 22 44 1900.684 213^2 .687 213.1 \ 1900.68 213.1 63^02 62.94 62.98 Without change. A gives 212?4 : 62^85 (1875.35) 2n. Large star supposed to be a close pair from an occultation observed by Hough (A.J. 474). Condi- tions too unfavorable at the time of my measures to detect a very close pair. S 585. D.M.(4)733. 8.6 ... 10.5 R.A. =4" 36- 21" Decl. = + 4 29' 1900.706 275? 7 1U85 .742 275.9 12.05 1900.72 275.8 11.95 No recent measures, but unchanged. Place here- tofore approximate ; identified as above. The mag- nitude of A in D.M. is 9.2 ; S gives 8.3. Hall. D.M.(1)809. 9.1 ... 9.1 R.A. = 4" 3 Decl. = 57- 53 s ) 1 51' f 1901.742 .758 .760 1901.75 157?3 155.8 156.1 156.4 2^35 2.37 2.53 2.42 Identified as above. The only other measures are by Hall, 157?4 : 2^29 (1888.10) Sn. D.M.(21)694. 9.1 ... 10.5 R.A. = 4 h 38 m 51 Decl. = +21 3' 1901.758 .799 1901.78 114? 7 113.8 114.2 5^44 5.37 5.40 18 S. W. BURXHAM 19 This was measured in trying to find S 593 re/., which should be about l m /and 10 11. S gave Class IV and magnitudes 8.9 ... 8.9. There is no such star in this place. The 8m star some distance sf has a very distant llm star in 103, but neither that nor the one measured is likely to be the S star. H 350. 11 ... 11 RA. =4"4318') DecL = -f 34 35' \ 1901.799 308?3 5-'32 .818 308.2 4.96 H 689. L 9355. 7.5 ... 113 RA. = 4 h 52 m 8 s / Decl. = - 2 24' \ 1901.758 277?6 20'76 .760 279.3 21.18 1901.76 278.4 20.97 The only other measures are 275?6 : 20^67 (1880.63) 2n /. W 1 IV. 1215. 9 ... 9 RA. =4 1 >56- 5 s > Decl. = + 13 11' \ 1900.744 83?0 4-'38 .763 84.0 4.39 1900.81 308.2 5.14 H describes it as " extremely delicate and beauti- ful," and gives 310-*- : 2"-+-. It is in the field with D.M.(34)914. 9 VI 83. D.M.(6)765. 7 ... 85 RA. =4 h 44->12) Decl. = + 6> 37' \ 1900.684 4?1 96^08 .742 3.7 95.78 1900.75 83.5 4.38 " Duplex " in Weisse. The only other measures are in Leipsic A.G., p. 207, 82?2 : 4-'59 (1893.79) In. H 2247. S.D.(5)1135. 8.5 ... 11.9 RA. =4"56'51 5 ) Decl. = - 5' 53' J A and B 1901.758 58? 2 20-'91 .796 55.7 20.67 1900.71 3.9 95.93 The only other measure is by Tj., 11 : 80 '97 (1783.79) In. S 457. 8.3 ... 83 RA. =4 h 46 m 59) Decl. = - 1 28' 1900.763 354? 5 41 .'03 .780 354.5 41.01 1901.758 354.6 40.96 1901.77 57.0 20.79 A and C 1901.758 18?7 33-'18 .796 17.1 33.42 1901.77 17.9 33.30 C and D (11.6 . . . 13) 1901.758 313?5 2-'67 .796 315.2 3.26 1901.10 354.5 41.00 No other measures except S, 353?7 : 41 .'49 (1824.42) 3)i. These stars are D.M.(-1)744 and 743. H 3705. O.Arg.S. 3514. 7.7 ... 10.5 R.A. =4 h 51'24 s > Decl. = - 16 19' \" 1901.758 141? 7 22 .'62 .796 140.8 22.14 1901.77 314.3 2.96 No other measures. H gives 55?6 for AB. The closer star is new. OS 94 rej. O.Arg.N. 5495. 7.5 ... 11 ... 113 RA. = 4"58 m 7 s ) Decl. = + 50 8' i A and B 1900.744 304? 3 17-'90 .763 301.0 18.17 1901.78 141.2 22.38 The only other measures are : IQQ^ Q 1QQQ 1fi"-i- IM TT 1880.4 141.0 22?29 3n ft 1900.75 304.1 18.03 19 20 MEASURES OF DOUBLE STARS 1900.744 .763 AandC 63? 7 62.6 25^14 24.95 1900.75 63.1 25.04 There is a 14m star from A, 340?9 : 26^1. S640. (=H356) R.A. = 4 h 59"'ll s ) Decl. = + 33 15' \ A and B 1900.725 96? 9 .763 96.3 1900.74 96.6 A and C (C = llm) 1900.725 315? 6 .763 1900.74 317.0 316.3 9 '52 9.44 9.48 25^26 25.30 25.28 C not in S ; first noted by H ; not measured be- fore. No recent measures of AB, but without change. S 466 (=H VI. 105). 105 Tauri R.A. = 5" O m 45' ) Decl. = +21 33' \ 1900.725 250? 8 111 f 45 .763 250.3 111.29 1900.74 250.5 111.37 Both stars have meridian positions. No meas- ures except S. 1825.04 251?0 109^99 2n S 1825 251.2 116.33 Weisse 1875 250.7 110.44 A.G.Berlin The proper motion of A is very small, 0'025 in 276?8. Edgcomb. 103 Tauri. 6 ... 13 R.A. =5 h 048 S Decl. = + 24 6' A and B 147?0 152.3 1900.725 .763 1900.74 149.6 AandC(=H V. 114) 1900.725 198?0 .763 197.4 13^02 13.57 13.30 35f52 35.50 1900.74 197.7 35.51 The faint star B was detected by Edgcomb in 1878. The only measures are 147?9 : 12T94 (1878.98) In ft; and for the other, 197?6 : 30^05 (1783.80) In by?- S 642 rej. 66 Eridani. 6 ... 9.7 R.A. = 5 h Decl. = 4 49' 1900.763 .780 1900.77 9? 3 10.0 9.6 52^85 52.77 52.81 The only other measures are my own, 9?4 : 52 '50 (1879.95) In. S 468 (= S 650 rej.). R.A. = 5 h 3 m 27 Decl. - + 13 51 1900.744 165?4 .763 165.8 8 ... 8.1 1900.75 165.6 26^25 26.45 26.35 No measures since South, 162?6 : 27 '18 (1825.00) 2n. The A.G. positions give 164?4 : 26^68. R.A. = 5" Decl. OS 517 . = 5" 7 m 18 s ) :1. = + 1 49' \ A and B 1900.780 308^9 AB and C (C = 12.2) 1900.780 137?3 1901.815 139.2 6^88 6.72 1901.30 138.2 6.80 The faint star discovered by Hall. Unchanged. OS 102 R.A. = 5 h 7-" 18 s ) Decl. = + 25' i Certainly round, with all powers, with good con- ditions 1900.78. It has not been seen otherwise in the last thirty years. It is probably not a double star. W 2 V. 199 = D.M.(31)913 R.A. =5" 9 31 s Decl. = + 31 8 Noted as " duplex " in Weisse. It is not a double star of any kind (1901.79). There is a 4" pair of 12m stars in the field. 20 S. W. BUBNHAM 21 X Aurigae. AD = H V. 22- R.A. =5" 10- 42 s ) Decl. = +39 59' \ A and B (B = 135) 1900.780 273?4 28.'92 .782 275.4 29.30 H 3272. 8 ... 11.5 ... 11 R.A. =5" 11" 48 s I Decl. = + 39 14' \ A and B 1900.782 342? 1 1901.720 342.0 .1 19^40 19.48 1900.78 274.4 29.11 A and C (C = 12.2) 1900.780 224?4 33^57 .782 225.0 34.09 1901.586 225.5 33.83 1901.25 342.0 A and C 1900.782 295?5 1901.720 295.0 19.44 29'26 29.06 1901.25 295.2 A and D 1900.782 42?4 1901.605 42.5 .720 41.9 29.16 33 '13 33.71 33.25 1901.05 225.0 33.83 A and D (=23App II) 1900.780 7?2 133'64 .782 7.2 133.38 1900.78 7.2 133.51 The nearest star has not been seen before. C was added by me with the l&|-in. The measures now show that this star is not moving with A; the only measures are 197?6 : 40 M7 (1879.28) 2 ft. The change is due to the proper motion of A, as is that in the old companion D. The large star has a proper motion of 0-'838 in 141?9. A comparison of my measures with those of S in 1836 gives 0'856 in 140?6. 9 V. 88. D.M.(39)1250. 9 ... 10 R.A. -5 h 10 m 46 s ) 1901.40 42.3 33.36 The only measures are mine of 1879, which show no change. Aitken 53. S.D.(3)1061. 8.3 ... 11.2 R.A. =5 h 13 m 6 s ) Decl. = - 3' 12' \ 1900.742 48?3 5-'13 .763 47.2 5.13 1901.873 46.9 4.96 Decl. = + 40 \ 1900.782 217?8 32-'43 1901.586 217.3 32.46 1901.12 47.5 This star has a large proper motion and the companion is moving with it. H 697. B.A.C. 1657. 6.8 . . R.A. =5" 15" 24 s I Decl. = - 32' \ A and B 1900.763 59? 8 1901.838 59.8 5.07 0-'690 in 77?5, .11.7 33 '06 33.10 1901.18 217.5 32.44 Near X Auriga?. No measures since 9, 215?9 : 35'25 Q783.49) In. There are two faint stars between. W- V. 269. 8.9 ... 9.0 R.A. =5" 11 43 s ) Decl. = +36" 5' \ A and B 1900.782 329?8 2^85 1901.722 329.6 2.81 1901.30 59.8 A and C (C = 11.2) 1900.763 110? 8 1901.838 112.2 33.08 38^60 38.28* 1901.25 329.7 2.83 A and C (C = 13.5) 1900.782 224?0 9 '88 1901.722 225.3 10.36 1901.30 111-5 The only other measures are : 1878.99 59? 8 32 -'40 1878.99 109.8 36.81 38.44 In P In ft 1901.25 224.8 10.12 Noted in Weisse "duplex 3"." No other measures. 21 22 MEASURES OF DOUBLE STARS There is no error in reducing the last distance, but it seems unlikely that the faint star should have any such motion. The proper motion of A is very small, 0?017 in 339?4. Madler SDf7Yl050 92 92 S 484. D.M.(33)1064. 8.4 ... 8.4 R.A. = 5 h 21 m 46 s ) Decl. = +33 21' \ 1900.744 169?9 58^90 .763 170.0 59.08 1901.815 170.2 59.03 R.A. = 5 h 15 m 32 s ) Decl. = - 7 0' J 1901.760 159? 3 3^09 .796 159.5 3.13 1901.11 170.0 59.00 No measures since South : 1825.12 170?0 58^95 2n 1901.78 159.4 3.11 The only other measures since Ma in 1843 are mine of 1877. There appears to be no change. H 701. D.M.(31)992. 7.2 . . 10.9 R.A. =5" 22 50 s ) Decl. = +31 25' \ 1901.796 137?3 35^40 .799 136.8 35.13 9 V. 68. L 10165. 7.7 ... 8.5 R.A. = 5 h 19 m s | Decl. = - 2 57' S 1901.854 281?8 135^61 .873 281.8 136.31 1901.79 137.0 35.26 H has no estimates of angle and distance ; " large star very red," and magnitudes 9 ... 15. It is 7.1m in D.M. Other distant companions ; only reddish. This is in his place. 1901.86 281.8 135.96 Except an angle in Cin 6 , the only measures are : 1783.76 277?9 120^18 In H S 483. L 10164. 7.4 ... 8.5 Webb. S.D.(4)1146 and 1145 R.A. = 5 h 23 m 5 s ) Decl. = - 4 47' \ 1901.796 228? 2 46^94 .815 229.0 46.81 R.A. _ 5 h 20 m 9 s ) Decl. = +33 41' \ 1900.744 51?2 95^18 .763 50.9 95.32 1901.815 50.9 95.46 1901.80 228.6 46.87 A is variable, discovered by Webb in 1874. The only other measures are 227?4 : 46-'70 (1879.14) 2n ft. 1901.11 51.0 95.32 South made the distance 87 '6 in 1825. The only other measures since are Engelhardt in 1891. The change seems to correspond to the proper motion of A, OM71 in 180?0. 9 V. 101. 7 ... 10 R.A. =5 h 23 m 37 s ) Decl. = - 7 21' J 1900.763 116?6 47^90 1901.815 117.6 48.42 .838 117.2 48.47 S713. D.M.(6")928 R.A. =5" 20- 45 s ) Decl. = + 6 52' \ 1901.838 30?4 2^88 .873 30.9 3.23 1901.41 117.1 48.26 The only measures are by ? in 1783, 105? : 44 T25. Hd 69. S.D.(22)1125. 9 ... 12.2 R.A. =5" 23 57 s ) 1901.85 30.6 3.05 No measures since A, but without change. It was observed more particularly, to identify the star, and Decl. = - 22 43' \ 1901.815 44? 6 12^56 2.145 42.9 12.90 get the correct place. 1901.98 43.7 12.73 22 S. W. BURXHAM 23 No measures at Harvard. Identified, and cor- rected place given here. Hd 71, which is given as 2/ and 2's, is the same- pair measured above. Sh 61. D.M.(2)986. 8.1 ... 8.5 S 490. 8.2 ... 8.7 RA. =5 h 29 m 38 s / Decl. = - 5 30' j 1900.763 214?5 78^20 .780 214.6 78.05 R.A. =5 h 25 m 25 5 > Decl. = + 2 44' \ 1901.815 352? 5 66?90 .838 353.1 67.27 1900.77 214.5 78.12 The only measures are by South : 1825.21 214?5 77^68 2n 1901.82 352.8 67.08 The only other measures since 1822 are mine in 1879. There is no change. The A.G. positions give 352?4: 68^09 (1881). Engelmann. S.D.(6)1212 and 1211. 8.6 ... 8.9 W V. 735. 8.5 ... 9.8 R.A. =5*30- 39*) Decl. = - 13" 54' ) 1901.838 151?5 44-'20 1902.145 151.9 44.32 R.A. =5" 26- 28 s ( Decl. = - 6" 29' \ 1901.838 251?3 44 .'87 .873 251.2 44.88 1901.99 151.7 44.26 Marked "duplex" in Weisse. It is given by Schjellerup in his list of doubles, and estimated 140? : 15' : 8.5 ... 9.5. These two stars are S D (13 3 )1192 1901.85 251.2 44.87 The onlv measures are by Engelmann, 251? 4 : 44^58 (1863.10) 5. S 735. 8.4 ... 8.7 RA. = 5 h 27 2 s ) Decl. = - 6 35' } 1901.815 352? 2 41 .'64 2.145 351.6 41.50 and 1193, the latter being 1 :5/ and 0'2n of the other. There would seem to be no question of considerable change. The meridian positions of A do not indi- cate any certain proper motion. The movement is probably in the small star. H 3277. D.M.(17')972. 8.8 ... 13 R.A. =532 m 23 s ) Decl. = + 17 41' \ 1901.98 351.9 41.57 The change is due to proper motion. 1900.744 69? 1 23-'20 .763 70.5 22.95 1831.15 355?2 30^90 In 2 These measures give for the proper motion of A, assuming the companion to be fixed, 0'151 in the direction of 162?4. 9V. 118. D.M.(-1)949. 7.1... 10.7 R.A. = 5 h 27"'58 s ) Decl. = - 1 7' \ 1901.796 263? 6 27^58 .815 263.5 27.50 1900.75 69.8 23.07 I could not see the companion with the 6-in. in 1876. H gave 73?5 : 20 (1831). It is near 2 759. W 2 V. 1005. 9 ... 9 R.A. =5 h 34 3 5 ) Decl. = +40' 49' \ 1901.758 18?4 20-'99 .799 17.5 20.97 1901.80 263.5 27.54 ? has only the angle 256?9 in 1783, and there are no other measures since. 1901.78 17.9 20.98 "Duplex" in Weisse. No other measures. The components are D.M.(40)1383 and 1384. 23 MEASURES OP DOUBLE STARS S 771. D.M.(19)1026. 9.0 ... 9.2 R.A. = 5 h 34 m 42 s Decl. = + 19 29' 1901.838 55?2 24^29 .876 55.3 24.00 1901.85 55.2 24.14 The motion is rectilinear. It was put on the list more particularly for identification. In looking for this, a similar pair 7 ' n and 4 8 / was measured : 1901.85 342?5 29^25 8.9 ... 10.4 2n This is D.M.(19)1027. 29 Camelop. $ IV. 125 = H 2278 R.A. = 5 h 40 m 19 s Decl. = + 56 53' 1900.780 .782 130? 7 130.8 24^84 24.95 1900.78 130.7 24.90 f found 137?6 : 22^43 (1783.50) In. The proper motion is small, 0-027 in 244?0. D.M.(12)901. 8.1 ... 13 R.A. = 5 h 41 m 15' Decl. = + 12 1' 1900.744 .763 1901.873 339? 1 338.2 340.3 10.02 9.15 1901.13 339.2 9.45 Measured in looking for H 5465, which should be about l m /. 1900.744 .763 1901.873 561. L 10969. R.A. =5 h 41 m 18 ! Decl. = + 12 22' 3?0 2.8 3.3 7.4 ... 13 1901.13 3.0 Measured in looking for H 5465. 19^17 18.93 19.02 19.04 S 500. L 10961 and 10963. R.A. =5" 41 "-53* Decl. = + 32 56' 1901.796 89?3 .799 89.2 8.5 ... 8.5 59^99 59.95 1901.79 89.2 59.97 No other measures except S,88?9: 59-46 (1825.06)3>i, H5465 R.A. =5"42 m 5 s Decl. = + 11 57' The description in H is 45 : 12" : 7 . . . (1823) : "An excessively minute companion suspected." I looked for it with the 6-in., 1873-74, and with the 18|- in., 1878, without success; and there is no companion visible in the 40-in. on two nights, 1900-1. The place in H is that of the 7.5m star, D.M.(11 )945. S 798. 7 ... 9.5 R.A. =5" 42 25 s Decl. = - 8 25' 1900.763 .780 180? 9 181.1 20^94 20.87 1900.77 181.0 20.90 No measures since A, who suspected a 10* com- panion. There is nothing nearer than the S star. Unchanged. 56 Orionis. R.A. =5 h 46 Decl. = + 1 1901.873 212? 5 .876 211.1 13.5 13 s 49' 1901.87 211.8 43^45 43.37 43.41 Taken by mistake for 59 Orionis. There are no other measures. Anderson. L 11231. 7.8 R.A. =5"49 n '18 s Decl. = - 19 44' 1900.780 1901.873 20? 5 20.0 10.4 9^26 9.02 1901.32 20.2 9.14 Given in Hall's observations as discovered by Geo. Anderson with the 26-inch. The place is in error by about 2 m R.A. and 16' Decl. The only measures are : 1876.09 19?4 9aO 2n Hall H 5466. D.M.(-1)1075. R.A. = 5 h 51'"38 s ) Decl. = 1 50' \ Given in H as 8m, with the note: "seen double, but not verified by magnifying." The place is that of the 9.2m star given here. The 40-in. shows a 14m companion, 110?7 ; 16M (1901.79). 24 S. W. BUBNHAM 25 V. 100. 59 Orients. ... 9.7 RJL =5 h 52'10 s ( Decl. = -h 1 49' \ 1900.780 204?3 36-76 1901.876 204.4 36.73 No measures in the last century. 1783.79 229?0 72^83 In ? The small star appears to be D.M.(19)1252. The proper motion of A is small, 0'020 in 95?8. H 2302. 71 Orionis RA. = 6" 7 m 46' ) Decl. = +19 12' \ 1900.744 203U 29^20 .780 202.4 29.38 1901.32 204.3 36.74 The proper motion is very small, 0'015 in 136?3. The only measures are : 1783.02 205? 37T25 In Tj. 1878.18 205.8 36.57 In /3 S 829. 8.9 ... 10.2 ... 10.4 Decl. = - 11 42' \ A and B 1900.763 235? 5 17?69 .780 235.8 17.93 1900.76 202.7 29.29 H estimated the positions. The only measures are by Engelhardt, 202?4 : 3K98( 1886.21 )2n. The change is due to the proper motion of A, 0'203 in 213?3. H 2315. 11.7 . . . 11.7 RA. =615"' 6 s / Decl. = - 7= 14' \ 1901.796 3?1 6-'37 .873 2.1 6.36 1900.77 235.6 17.81 BandC 1900.763 220?1 5^60 .780 220.7 5.29 1900.77 220.4 5.44 J could not see the smaller star. S found 217?7 : 4 '56 (1832. 69) 2n and 238?4 : 16^50 for AB, which indicate some change. 2861 RA. = 6 h 3" 36 s / Decl. = + 30 42' \ A and B 1900.780 17?3 64.'92 1901.720 17.1 65.79 .722 16.7 65.60 1901.83 2.6 6.36 Given by H, 3?0: l' : 13 = 13 (1830), but the distance may be underestimated. It is S.D.(7 P )1384 given as 10m. In looking for this, a very close pair was found about 1"^ and 2 H. This is the 8m star, L 12112. S 529. W 1 VI. 883. 7 ... 8 ... 12 RA. =630 n >51 s ) Decl. = + 12" 17' \ A and B 1901.815 153? 8 73 -'85 .838 154.6 74.11 1901.41 17.0 65.47 BandC 1900.780 138?4 l-'65 1901.720 138.1 1.58 1901.25 138.2 1.61 Xo change iii BC, but the distance of A is slowly decreasing. Seabroke thought the principal star was a 0'5 pair. It appears now perfectly round. 9 VI. 72. 68 Orionis. B = 8.6 R.A. = 6 h 4 55 s ) Decl. = + 19 49' \ 1900.744 214?9 85-'52 .780 213.7 85.56 1901.82 154.2 73.98 AandC 1901.815 169? 1 167^99 .838 169.2 168.32 1901.82 169.1 168.15 No measures since South in 1825.12; 162?9 : 91 '99 and 170?7 : 187 -'91. This change is explained by the proper motion of A of 0'289 in 194? 7. B is a red star. 1900.76 213.8 85.54 25 26 MEASURES OF DOUBLE STABS OS 154. L 12831. 6.4 ... 8.5 R.A. = 6"35 ra 52 s ) Decl. = +40 4.5' \ 1900.782 123?6 26M)7 1901.720 123.3 26.15 H 748. S.D.(8)1706. 8.4 ... 10.5 . . . 11.5 R.A. =6 h 57 m 12 s ) Decl. = - 8 10' \ A and B 1901.796 170?6 6^79 1901.25 123.4 26.11 .873 171.9 6.91 Rectilinear motion. 1901.83 171.2 6.85 AandC 1901.796 356? 9 15^29 .873 358.1 15.21 6 (jreminorum. if. VI. 7o o 5o3. ii 9.5 R.A. =6 h 36 ra 33 s ) Decl. = +25 15' \ 1900.782 94? 1 110 ?41 1901.818 93.9 110.49 1901.83 357.5 15.25 In Messier 50. H gave the angles 170?4 and 0?5 (1820). O21fi4v/ L 13675 73 112 1901.30 94.0 110.45 No measures since South, 93?7 : 11U58 (1825.04) 2w. The proper motion is very small, 0'025 in 258?4, which should give an increasing distance. R.A. =6"58 n '20 s ) Decl. = + 25' 3' J 1900.782 50? 6 13 .'80 1901.818 49.9 13.51 S 967 rej. S.D.(5)1797. 8.2 ... 10.5 R.A. =6"40 m 25 s ) Decl. = - 6 0' J 1900.763 189?9 13^22 .780 191.7 13.36 1901.30 50.2 13.65 At this time there were no published measures in the last fifty years. Madler's distance in 1843 is 9 '09. Hussey's measures in 1899 agree with mine. 2 1033 R.A. - 7 h 5 19 s ) 1900.77 190.8 13.29 The only measures are from the introduction to Mens. Mic., 191?5 : 11. '5 (1832.2) S. Decl. = + 52 45' \ A and B 1901.799 281?8 U64 .835 274.4 1.82 H 740. 8.2 ... 8.7 ... 11.7 R.A. = 6 h 45 ra 38 s ) Decl. = + 36' \ 1901.82 278.1 1.73 AandC 1901.799 271? 9 80 '02 .835 271.4 79.29 A and B 1900.763 8?0 2K03 1901.167 8.0 20.93 1901.82 271.6 79.65 C is not in S. No change in AB. 1783.06 266? 3 67^77 In f 1900.96 8.0 20.98 BandC 1900.763 281?4 8 .'72 1901.167 282.1 8.42 1880.53 271.7 78.80 2n Ball OS 168 rej. L 13937 R.A. = 7" 5'"39 5 ) Decl + 21 33' \ 1900.96 281.7 8.57 The only measures are : 1880.59 8?0 20f84 4w /3 A and B 1900.782 66?3 24^20 1901.167 67.2 23.78 1880.60 283.8 8.18 2n /3 1900.97 66.7 23.99 26 S. W. BUBNHAM 27 A and C 1900.782 114?3 51*97 1901.167 114.3 51.70 D.M.(20)1775. 6 ... 13 RA. = 7"14 m 52 s ) Decl. = + 20' 40' \ A and B 1900.782 205? 1 17^62 1901.818 205.1 17.89 1900.97 114.3 51.83 At this time no published measures since 1868. From his measures, compared with those of J, Hus- sey finds for the proper motion of A, 0.'047 in 126?6. W 2 VII 118. 8.2 ... 8.7 R.A. = 7" 5 58* ) Decl. = + 15 23' \ 1901.167 157?0 2^16 .818 157.3 2.27 1901.08 205.1 17.75 BandC 1900.782 245?2 7*73 Taken at first for H 1775. The principal star has a proper motion of 0*075 in 263?9. 9 V. 66 = S 548. 6.9 ... 12.2 . . . 8.4 RA. = 7 h 20 m 31 s 1901.49 157.1 2.21 In Weisse "duplex 2"." No other measures. The magnitude in D.M. is 7.5. H 2372. D.M.(20)1768. 8.1 ... 12.5 RA. = 7 h 12 m 43 s ) !-)! 1 Of)* A-l I ( Decl. = +22= 23 J A and B 1901.203 19? 6 11*52 .876 18.6 11.38 1901.54 19.1 11.45 AandC 1901.203 276? 4 35 .'32 .876 276.2 35.29 1901.818 2?3 22.'45 .876 3.3 22.34 1901.54 276.3 35.30 No material change in the bright stars. The only prior measure of B is by Espin in 1892. C is dis- tinctly greenish. 9 V. 63 = Sh 368. 63 Geminorum RA. = 7 h 20 m 37 s ) Decl. = +21 42' \ 1900.782 323? 2 42*77 1901.203 323.0 42.91 1901.84 2.8 22.39 No other measures. S 546. 8.5 ... 8.6 ... 8.6 R.A. = 7 h 13 m 4 s ) Decl. = +31= 42' \ A and B 1901.720 358? 8 82*98 .818 358.6 82.88 1900.99 323.1 42.84 The large star has a proper motion of 0*122 in 214?1 (Berlin A.G.). Tf. made the distance 44*25 (1785), and Sh the angle 326?2 (1826). The only complete measures are : 1863.2 324?3 44 .'61 Kadcliffe Y Canis Minoris. . . . 13.0 RA. = 7 h 21 m 38 s ) Decl. = + 9 3 10' \ 1901.203 240? 2 31'28 .873 241.5 31.47 .878 243.6 31.22 1901.77 358.7 82.93 A and C 1901.720 68?0 143*94 .818 68.1 144.14 1901.77 68.0 144.04 The only other measures are : 1825.12 359?4 79*60 In S 1825.11 69.2 142.64 In S These stars are D M.(31)1540, 1541, and 1543. There are faint stars between AB and AC. 1901.65 241.8 31.32 27 28 MEASURES OF DOUBLE STABS The only measures are : 1836.19 247?3 34^62 In Lament 1878.06 243.2 32.60 In ft The large star has a proper motion of 0'093 in 286?9, and the change shown by the measures corre- H 3973. S.D.(20)1999. 8.4 ... 9.3 R.A. = 7 h 26 m 37 s ) Decl. = - 20 40' \ 1901.873 37?7 9-00 1902.222 38.8 8.65 sponds to this movement. S 550. 6.8 ... 7.1 R.A. = 7 h 22 m 15 s / Decl. = - 18 15' \ 1901.167 115?8 39'54 .206 116.1 39.55 1902.05 38.2 8.82 H gives 36?3 : 8? (1837.10), and calls the com- panion "remarkable brick red." It is decidedly reddish. This pair is catalogued as new by See (=X81). S 1115. S,D.(12)2016. 9.5 ... 9.6 1901.18 115.9 39.54 The only other measures are by S, 116?2 : 40^04 (1825.03) 2n. These stars are L 15459 and 15460, the positions giving 112?9 : 38 '65 (1800). R.A. = 7 h 26 m 59s ) Decl. = - 12 37' \ 1901.873 139? 9 12^35 1902.222 140.1 12.12 S 1101. 9... 9.1 R.A. = 7 h 23">ll s ) Decl. = - 13 34' \ 1901.167 89? 1 6^37 .203 88.4 6.47 1902.05 140.0 12.23 Without change. The companion is S.D.(12) 2017. (See next pair.) J 13. S.D.(12)2019. 9.6 ... 13.7 ... 9.7 R.A. = 7 h 27 m 20 ! ) 1901.18 88.7 6.42 The only measures since S are by Ma and A. No motion. Decl. = - 12 34' } A and B (new) 1901.873 208? 8 3^11 1902.222 209.3 2.70 S 1104. L 14619 R.A. = 7" 23'" 55 s ) Decl. = - 14 44' \ A and B 1902.05 209.0 2.90 A and C (= A 13) 1901.873 287?6 1K87 1902.222 288.9 11.75 1900.780 3303 2f40 1901.873 333.5 2.30 1902.05 288.2 11.81 In the field with S 1115 ; the wide stars noted by 1901.132 331.9 2.35 A and C. C = 11.7 1900.780 187?6 20-'43 1901.203 186.0 20.63 Dembowski. The large telescope shows a nearer component. The only measures of AC are : 1867.10 288?4 ll-'44 2n A 1900.99 186.8 20.53 A and D. D = 11.6 1900.780 5?8 37^88 1901.203 5.7 38.29 S 555. L 14888. 7.5 ... 7.7 R.A. = 7 h 31 m 10 s ) Decl. = - 14 10' \ IQfil 9TV! 99flQ QH'7A 1900.99 5.7 38.08 1902.219 228.4 95.77 The distant stars not in S. A has a proper mo- tion of 0-312 in 216?1. The change in C and D from the measures of Engelmann in 1882 is due to this motion of A. 1901.71 228.3 95.75 Nothing else since South : 1825.00 227?7 94f37 In S 28 S. W. BURNHAM 29 H 765. L 14890. 8.6 ... 11 ... 11 t> * r h QO ra Qfks i iWiY. I _ r ' 1 Decl. =-+27' 0' \ A and B 1901.720 212? 8 23^52 .818 212.3 23.59 9 says, ''near 9 Argus; place very doubtful," and gives the place of 9 Argus. His estimate of the distance is 8" (1781). This star has a proper motion of O.'lOl in 133?8. OS 183 rej. 7.5 ... 12 RA. = 7 h 47 m 8 s ) Decl. = + 16" il' 1 1901.815 20?4 15f87 .818 20.1 15.71 1901.77 212.5 23.55 A and C 1901.720 296?7 40?84 .818 296.3 40.55 1901.77 296.5 40.69 No other measures. Distances estimated 15' and 18' by H. A has a proper motion of 0'163 in 181?9. H 2405. 24 Lyncis RA. = 7 h 3251 ) Decl. = +58' 59 > 1901.799 319? 2 54^50 .854 319.8 54.86 1901.81 20.2 15.79 Probably unchanged ; 19?8 : 16^19 (1878.12) 3n ft S.D.(13)2277. 7 ... 12 ... 12 RA. = 7M7 m 26 s ) Decl. = - 13= 45' \ A and B 1901.167 161? 6 42^39 .203 163.5 41.29 1901.82 319.5 54.68 No other measures. H,319?4:60 - =t. The proper motion is small, 0'077 in 217?7. Procyon RA. = 7 h 33" 1*[ Decl. = + 5' 33' ^ A and C 1897.884 341 ?2 57 -'40 S 560. 6.5 ... 8.6 RA. = 741"> s ( 1901.18 162.5 41.84 BandC 1901.203 145? 9 4-' 16 Measured in looking for III. 28. D.M.(50=)1495. 8.9... 8.9 RA. = 7" 49 22' ) Decl. = +50 35' f 1901.742 103?6 3-'24 .799 104.8 3.17 Ltecl. -f- 22a 4 ) 1901.720 358?7 89^50 .818 358.9 89.68 1901.77 104.2 3.20 " Duplex " in Harvard A.G. The only measures are by Espin, 285?2 : 3-'14 (1900.12) 2. D.M<-1 C )1949. 95... 9.5 RA. = 7 h 59 m 47 s ) Decl. = - 1 25' \ 1902.145 178?6 6-'62 .222 178.9 6.89 1901.77 358.8 89.59 Without change. The only measures since S are : 1873.24 . 358?7 89^90 4,< or 9 III. 28. L 15389. 7.1 ... 10.7 RA. =7 h 46">53* ) Decl. = - 13" 33' i 1901.203 194?1 23^93 .206 195.5 24.07 1902.18 178.7 6.75 Described as ''duplex or nebulous" in Nico. A.G. Xo nebulous appearance with the 40-inch. 1901.20 194.8 24.00 29 30 MEASURES OF DOUBLE STARS W 2 VII. 1609 R.A. = 8 h O m 7' Decl. = +31 54' Noted "duplex?" in Weisse. There are two distant companions be of any interest (1901.72). H3308. D.M.(35)1767. R.A. = 8 h 2 m 21' Decl. = +35 49' 1901.722 263? 3 .742 263.2 .758 263.4 ! It is not double. , but too remote to 7 ... 10.8 I 45^81 45.65 45.75 AandC 1901.742 280?4 77 .'60 .854 280.5 77.70 sen- 1901.80 280.4 77.65 ? V. 109. 6 ... 10.5 R.A. = 8" 19- 27 s ) Decl. = + V 57' \ 1901.203 342?6 3K22 1902.142 342.1 31.70 .145 342.9 31.32 1901.83 342.5 31.41 The only earlier measures are : 1783.14 325?0 35^40 In ? 1880.61 343.0 31.86 2n ft The large star does not appear to have any sible proper motion. Probably without change. A.G.C. 3. p Hydrae. 5 ... 12.5 R.A. = 8"42 m 5 s ) Decl. = + 6 17' i 1901.873 146? 5 12^05 1902.145 145.5 12.04 1901.74 263.3 Only H, 234?6 : 40" (1831). has a proper motion of 0'328 in measure A was thought to be a verified. H2430. D.M.(53)122. 8.9 RA. =8" 3'49 Decl. = +53 43' A and B 1901.742 311?2 .799 309.4 45.74 The principal star 138? 1. In my first close pair, but not . . . 12 . . . 12.5 i . 20^44 20.37 1902.01 146.0 12.04 Discovered by Alvan G. Clark with the McCor- mick 26-inch. Apparently without change. 1878.07 144?9 12?40 3w ft H 4146. L 17541. 6.7 ... 12 R.A. = 8 h 46 m 48 s ) Decl. = - 12 47' \ 1901.167 103? 2 34^00 .203 102.9 33.68 1901.77 310.3 BandC 1901.742 184?0 .799 180.2 20.40 8^20 8.55 1901.77 182.1 8.37 H gives 311?5 : 15" and 177 : 3" and mags. 8, 13, and 14. No other measures. The magnitude in D.M. is 9.2. OS 190 rej. R.A. = 8" 12"- 36 s [ Decl. = + 47" 48' \ A and a (= Hussey 224) 1901.742 316?3 4 .'09 .854 317.3 4.09 1901.18 103.0 33.84 H gives 99?2 : 35 : 6 . . . 14 (1836). His is I 1 " in error. S 585. 6 ... 6.3 R.A. = 8M9 m 4 s ) Decl. = - 17 45' \ 1901.167 146? 9 66^82 .203 146.9 66.84 K.A. stars 1901.80 316.8 A and B 1901.742 167?4 .854 167.6 4.09 38^57 38.43 1901.18 146.9 66.83 S gives 323?2 : 69-'36 (1825.22) 3n. These are L 17636 and 17638. 1901.80 167.5 38.50 30 S. W. BUBNHAM 31 Schjellerup 11. 9.1 . . . 9.2 R.A. =9" l m 36M Decl. = + 16' \ 1901.203 259?2 6?46 1902.222 261.3 6.53 S 611. S.D.(13')3193-4. 9 ... 9 R.A. =10" 35 53 s ) Decl. = - 14 5' ) 1902.145 193? 9 59-60 .219 193.3 59.55 1901.72 260.2 6.50 First noted by Schjellerup, and given with esti- mated position. The principal star is D.M.(0)2462. There is no evidence of motion. The only other measures are : 1874.26 260?9 6 .'21 2n A f VI. 47. 3 Leonis. 6 ... 10.5 R.A. = 9 h 22 m 6 s I "T\ rtl __ 1 Qo JO/ f 1902.18 193.6 59.57 The only other measure is : 1825 193?8 59.'33 In S H 838. 41 Sextantis. 6 ... 11.7 R.A. = 10 h 44 ra 17 s ) Decl. = - 8 16' \ 1901.299 303?9 27?04 .337 302.2 27.06 1901.167 80?2 24^90 .299 79.3 24.84 1901.32 303.0 27.05 The only other measures are 303?8 : 26^95 (1878.18) Iw /3. H called the small star 17 18m 1901.23 79.7 24.87 No measures by 9. The later positions do not show any material change. The only other measures are : 1852.19 81?6 25r?l 2n Lassell 1879.48 79.2 25.14 3n ft S 617. 6.6 ... 8.5 RA. = 10 h 47 m 19' ) Decl. = V 37' J 1901.167 177?8 35^25 .203 178.3 35.42 T Hyarae. jp. VI. 71 on lUo U llo< RA. =9 h 23 m 3 s ) Decl. = - 2 15' \ 1901.206 3? 7 65f29 .299 3.3 65.31 1901.18 178.0 35.33 The proper motion in the A.G. is 0^130 in 230?1 for each star. The components are L 20956 and 20957. 1800 179? 7 34^11 Lalande 1824 22 177 8 35 22 2n S 1901.25 3.5 65.30 The A.G. proper motion of A is 0?118 in 91 ?9, and B (L 18661) 0'180 in 90. As they are moving at nearly the same rate, there is little change. This pair was subsequently "observed and cata- logued by Sir John Herschel as $ 1167, but given with an error of 1 in the declination. There is no doubt of its identity with r Hydrae. 1880.66 178.6 35.09 3n Schiap H 4410. O.Arg.S.11162. 7.5 ... 13 RA. =ll h 2- 19 s ) Decl. = - 15' 19' j 1901.206 222?6 19^33 .299 221.8 19.71 1800 1?4 66 .'12 Lalande 1821.23 3.2 66.68 In Sh 1887.3 3.0 65.32 A.G. S 604. L 18884. 7.1 ... 8.7 R.A. = 9 h 29>59' ) Decl. = - 19 2' J 1901.206 90? 5 51^44 1902.222 90.5 51.20 1901.25 222.2 19.82 Only H, 205?3: 15" (1836.4). He calls it "diffi- cult," so the apparent change in angle may not be real. H 177. S.D.(2)3297. 9.6 ... 10.1 RA. =11" 3 21 s ) Decl. = - 2 46' ) 1901.206 128? 1 4f93 .299 131.1 4.87 1901.71 90.5 51.32 The only other measures are : 1825.17 90?5 5K84 2n S 1901.25 129.6 4.90 H gives 110 : 2", and says, "hardly divided with the sweeping power." 31 32 MEASURES OF DOUBLE STARS I, 1518 rej. D.M.(6)2421. 7.5 ... 9.7 ... 9.9 R.A. =11" 8 18 s / Decl. = + 5 55' J BandC (= 2 1518 rej.) 1901.167 350? 5 2^80 .299 353.0 3.69 .318 353.2 3.72 The only other measures are : 1878.24 351?6 30-'20 In /3 The principal star has a proper motion of 0'184 in 319?5, which evidently does not belong to the small star. Ho 52. 11 Comae. 5 ... 12.3 1901.26 352.2 3.40 A and B 1901.167 256? 7 103^49 .299 256.2 103.52 R.A. =12" 14 39 s ) Decl. = +18 27' j 1901.203 45?4 9-'15 .299 41.6 9.16 1901.23 256.4 103.50 .356 43.7 9.13 No other measures. Described as Class I in 2. W 2 XI. 621. R.A. = ll h 33Tf s > Decl. = +21' 59' J This star (= D.M.(22)2387) is noted "duplex 3' " in Weisse. Examined on two nights in 1901, but not seen double or with any near companion. It is a curious fact that in the Berlin A.G. this star has the note, "Comp. 9.5 1"-2"1" It is about \ m p 93 Leonis. I examined the star in question in May, 1874, with the 6-in. without seeing it double. 1901.28 43.6 9.15 The large star has a proper motion of 0'145 in 308?3. Comparing these positions with those of Hough in 1892, it is very probable that the small star has the same movement. Albany A.G. D.M.(2)2550. 8.5 ... 8.8 R.A. = 12"25 m 5 s / Decl. = + 2 46' \ 1901.356 286? 9 U40 .375 287.5 1.24 H2955 R.A. = ll59 m 16 s ) Decl. = + 39 20' \ The description in H is 315 : 15" : 8 . . . 18 (1830); "extremely faint." Examined on two nights, and no companion visible. 2 1601 R.A. = 12" 2' ) Decl. = +39 30' \ 1901.203 311?6 2M5 .318 311.7 2.31 1901.36 287.2 1.32 Noted "duplex?" in the Albany Catalogue. This is a new pair; no other measures. Pritchett. R.A. = 12 h ,31 m 0' ) Decl. = - 7" 0' ) A double star is given in this place in the Morri- son Observations, 7-6?8 : 5^89 (1880.36) In; magni- tudes not given. I carefully examined the place and vicinity without finding any pair of this description. It should be a short distance p the 5m star, 26 Vir- ginis. 1901.26 311.6 2.38 Measured in looking for the preceding pair, H 2955. H 203. W XII. 94. 6.8 ... 12.7 R.A. = 12" 8 m 6 s J H 522. 30 Comae. 6 ... 11.7 R.A. = 12 h 45 m 51 s [ Decl. = +28 13' \ 1901.318 11?8 42^46 .337 11.3 43.22 .356 12.0 43.08 Decl. 5 3 \ 1901.203 351?9 26?62 .206 351.3 25.77 .318 350.7 26.18 1901.34 11.7 42.92 The only other measures are 10?0 : 43'17 (1878.15) In /3. H gave the magnitudes 6 and 18. His R.A. is about 2J m too small. The proper motion is 0'115 1901.24 351.3 26.19 in 287?7. 32 S. W. BCBNHAM 33 8 Virginia. 3i . . . 105 RA. = 12" 49 34' ) Decl/= + 4 3' \ 1901.203 1392 157 -'81 .263 140.2 158.26 .414 139.4 158.13 -*he companion is S.D.(12 ; )3801. This pair has been entirely neglected by observers since , and the only measures are : 1783.18 306?9 2U82 In Tj. S 1739 rej. D.M.(31=)2478. 9^ ... 10 1901.29 139.6 158.07 The principal star has a proper motion of 0'499 in 263 1. The only other measures are : 1879.30 1423 152 '03 2n ft RA. = 13" 16" 57 s t Decl. = +31= 9 ( 1902.145 132? 7 12 .'93 .219 131.7 12.63 The computed place of the companion for 1901, from the first measures and the proper motion, is 139" 9: 158 '00. H2645. 53 Virginia. B = 11.8 RA. = 13" 5- 40 s ) Decl. = - 15 33' \ 1901.299 7?3 77 .'59 .318 6.9 76.52 .356 7.8 77.16 1902.18 132.2 12.78 No other measures. 75 Virginia. 5 ... 13.5 ... 12 RA. = 13" 26" 27 s ) Decl. = - 14 45' \ A and B 1902.145 321?0 18?82 .219 319.3 18.98 1901.32 7.3 77.09 No other measures. H estimates 30 : 50' (1830). The large star has a proper motion of 0'289 in 1648. 1902.18 320.1 18.90 AandC(=H2658) 1902.145 109?9 79-'74 .219 110.1 79.50 OS 261 RA. = 13" 6 m 24 s ) Decl. = +32 31' \ 1889.288 344? 9 1'45 Sh 162. 7.2 ... 7.7 RA. = 13 h 8 39' ) Decl. = - 10 43' \ 1902.145 50?8 7U14 .219 50.5 71.30 1902.18 110.0 79.62 The faint star not previously seen. The only complete measures of AC are : 1879.31 110?1 78-'29 2n ft S 1757 RA. =13" 28- 9 s ) Decl. = + 0* 18' \ 1901.203 76 7 2?41 .263 78.8 2.59 1902.18 50.6 71.22 .280 78.9 2.35 The principal star has a proper motion of 0'388 in 2194. The components are respectively L 24582 and 24584. 1823.34 61?7 44-'85 In Sh 1881.37 52.5 64.60 3 ft 9 IV. 119. S.D.(12)3802. 7.5 ... 10 RA. = 13" 16" 25' i Decl. = - 12' 33' \ 1902.145 312? 2 19^29 .219 310.5 19.04 1901.25 78.1 2.45 Although two orbits have been computed of this pair, the motion seems to be purely rectilinear, the change being due to the difference of the two proper motions. That of the principal star is 0'270 in 2779. (See Popular Astronomy, IV, 172.) H2659 RA. =13 h 28 m ll 5 I Decl. = + 40 33' \ The description in H is 315'+ : 10" : 8-9 ... 18; 1902.18 311.3 19.16 " requires verifying." I could not see this companion 33 34 MEASURES OF DOUBLE STABS with the 18|-in. in 1878, nor with the 40-in., 1901.20. The nearest star is 13m, 202?3 : 38 '1. It is probable that H was mistaken. His place is that of D.M.(40) 2666, given as 7.4m. H 2676. D.M.(50)2021. 7.8 ... 9.7 R.A. =13 h 38">12 s ) Decl. = +50 38' \ 1901.337 126?0 29^67 .356 125.0 29.66 pen R.A. =13" 31- 15- ) Decl. = - 14 7' \ 1901.299 260?5 4^56 .356 260.1 4.79 1901.34 125.5 29.66 Recently measured by Espin. Nothing else since H. S 1782. 1901.33 260.3 4.67 Measured in looking for the Egbert pair. R.A. =13 h 39 m 22 s ) Decl. = + 18 58' \ 1902.145 185?6 29'72 .219 185.0 29.67 H2666. S.D.(H)3763 R.A. = 13 h 32 m 2 s > Decl. = - 14 13' \ 1901.299 177?6 ' 13^83 .318 179.4 14.87 .366 182.4 14.19 1902.18 185.3 29.69 No recent measures, but unchanged. Howe. D.M.(6)2824. 9 ... 9.1 ... 11 R.A. =l3"57 n '22 s ) Decl. - + 6 22' \ 1901.32 179.8 14.30 H gives 176?7 : 8' : 9 . . . 15 (1830). A and B 1901.203 65?6 0?93 .263 64.9 0.92 Egbert R.A. = 13 h 34 m : ) Decl. = - 14 26' : \ 1901.23 65.2 0.92 AB and C 1901.203 189?3 14^33 .263 188.7 14.20 Measured once at Cincinnati, 3493 : 11 '70 : 9 ... 10 (1879.30). There is no such pair in or near this place. About 2 m / there is a small pair, 0?5 : 15 '43 : 8.5 ... 13.5 (1901.35) In. This star is S.D.(14)3783. The descriptions do not correspond, ft 611 is in the same vicinity. S 1774 re./. 7 . . . 10.5 R.A. =13" 35"- 39 s ) . "Ha^l - 1 K1 o 7 ' f 1901.23 189.0 14.26 No recent measures. Probably unchanged. Iden- tified as above. 21801 R.A. =13" 59 27 s ) Decl. = + 6" 32' J 1901.203 67? 5 19^51 .263 68.4 19.72 1901.337 133?7 17^87 .356 134.1 17.83 1901.23 67.9 19.61 1901.34 133.9 17.85 The principal star is given in Harvard A.G. a proper motion of 0'172 in 305?1. The only prior measures are: 1879.26 134?2 17^93 In ft The distance now should be 3 '7 more if the Howe. S.D.(12)3958. 8.2 ... 8.7 R.A. =13" 59- 30 s ) Decl. = - IS' 30' J 1901.203 7?5 13?46 .225 7.6 13.34 .299 7.6 13.34 proper motion is correct and the small star is fixed. 1901.24 7.6 13.38 34 S. W. BUENHAM 35 The original place is only approximate. The R.A. is about 2 m in error. The only other measures are in 1879. Apparently fixed. 13 Booth. 9 VI. 112. 5 ... 95 RA. = 14" 3- 48' > Eepin. D.M.(52=)1792. 9 ... 103 ... 9 RA. =14" 16" 15 s ) DecL = + 52" 13 \ AandB 1902.145 46?8 1'75 .219 47.8 1.68 DecL = + 50 1' J 1902.219 274?3 81^14 .222 274.4 80.99 1902.18 47.3 1.71 AandC 1902.22 274.3 81.06 1902.145 170-6 40-83 .219 170.1 40.86 The companion is preceding 1 the other. The only measures are: 1783.63 82?6 77^97 In H 1879.33 95.0 83.47 1 Cin The proper motion of the principal star is very small, 0'06 in 323. S1807 RA. = 14" 5= 6 s " ) DecL = - 2 46' $ 1901.203 2- . 6^88 299 26 6 88 1902.18 170.3 40.84 Discovered by Espin. No other measures of AB. The A.G. positions give for AC 190?1 : 41 -'75 (1875.7). H2714. (=Ho385). 7 . . . 11 RA. =14 h 17 n '18 s ) DecL = - 19 15' \ 1901.263 280? 1 23^09 .280 278.4 23.05 1901.25 27.4 6.88 H 1248. 12 ... 12.2 RA. = 14" 9-58') DecL = + 7" 54' ) 1901.356 163?2 7-'90 .370 163.9 7.99 19U1.Z7 Ziy.Z i.vi The angle seems to be increasing ; 266?4(1830)H ; 276?1(1879)P; 277?0(1891)Ho. The principal star is L 26283. H 546. S.D.(12 )4042. 7 ... 10.4 RA 14 h 18 m 48 5 / 1901.36 163.5 7.94 H gives 340 : 2' : 16 . . . 16.17 (1828), and savs. " The most minute double star I have hitherto oon " Tt i<= > littl e f t>if> Q -1m far D Hf ^S c V>*^Jtl DecL = - 12 49 \ 1902.145 42?6 39-35 .219 42.2 39.43 As in nearly all cases of this kind, H greatly under- estimated the distance. Howe. D.M.(24)2711. 8.5 ... 10.0 RA. =14" H- 6 s ) DecL = + 24 2' J 1902.145 79?2 3 '35 .219 78.6 3.48 1902.18 42.4 39.39 The K.A. in H is 4 too small, and the Decl. about 1 too small. He called the components red and blue. Xo other measures. S 1852 rej. B.A.C. 4799. 12 ... 95 RA. =14" 23 45 s ) 1902.18 78.9 3.41 Howe (Cin. 5 ) measured a pair in this place, 193? 7 : 5-42 : 8^ ... 10.5 (187935) In. Unless, there is a DecL = 3 43 ' \ 1901.225 267?9 24-74 .263 268.1 24.63 large error in the measure or the place, there would seem to be considerable relative motion. There is no other pair in the vicinity. 1901.24 268.0 24.68 No early measures, ft 268?1 : 25 -'16 (1879.30) 3n. 35 36 MEASURES OF DOUBLE STARS H 2728. p Bootis. 4 . R.A. = 14 h 26 m 42 5 Decl. = +30 54' 1902.145 335?9 .219 335.8 12.5 50^14 49.98 1902.18 335.8 50.06 Meridian positions give for the proper motion 0'151 in 316?9. The earliest complete measures are: 1879.87 334?0 53^25 2n ft Hd Zones. D.M.(1)2964 R.A. = 1435 m 38 5 ) Decl. = + 0' 54 J In Harvard Zones " appeared elongated." I could see no sign of duplicity (1901.20). If double, it must be very close. Sh 186. a Librae R.A. = 14"44 m 12 s Decl. = - 15 32' 1901.280 .299 314?0 314.2 231 ?08 230.97 1901.29 314.1 231.02 No recent measures. The smaller star is 8 Librae. Auwers gives 0'168 in 237?6 for the p.m. of A, and 0?153 in 241?9 for the other. 1755 314? 9 1823 314.5 1880 314.4 231 .'18 230.85 230.70 H564. D.M.(29)2618. 8 R.A. = 14 h 59 m ll s Decl. = +29" 33' 1901.206 32? 9 .225 32.6 Bradley Sh Gr. 10-year 11.4 1901.21 32.7 4U18 41.34 41.26 H gives 20 : 15" : 6 ... 20 (1820). There is no bright star in his place. The one measured has the same K.A., but is about 20's, and is probably the star in question. 1936. D.M.(27)2478 R.A. =15 h 16 ra 2 s Decl. = + 27 28 i 1901.206 .318 1901.26 231?5 232.0 231.7 20 .'36 20.30 20.33 No recent measures, and only Ma and A since S. Put on the list to identify and get correct place. Error in Mens. Microm. Without change. OS(App.)140. 8.'. .8 Decl. = + 8 59' [ 1901.471 179? 7 111T96 .512 179.8 112.32 1901.49 179.7 112.14 The only other measures are by A, 179?9 : 111 '85 (1874.97) 2n. The components are L 28309 and 28310. y Librae. 4.5 ... 11.7 R.A. = 15"28 m 48 s Decl. = - 14 23' 1901.471 1902.219 152? 5 152.9 42f04 41.81 1901.84 152.7 41.92 Companion first noted by Goldschmidt (Comp. Rend. LVI, 845). The only previous measure is : 1878.32 151?8 4U31 In ft OS 297. 8... 11.5 R.A. = 15 h 29 m 40 s Decl. = + 25" 25' 1901.318 138? 6 .320 136.2 .395 137.1 1901.34 137.3 4^24 4.81 4.77 4.61 The change is due to proper motion. I do not find this is given from meridian positions. From all the measures Hussey gets 0'149 in 156?5 for the movement of A. W 2 XV. 752 = D.M.(23)2838 R.A. = 1533 m 10 s ) Decl. = +23= 4' \ Noted in Weisse "duplex?" A 7.4m star, and certainly not double (1901.28). D.M.(4)3055. 8.5 ... 9.0 R.A. = 15 h 39 m 22 s Decl. = + 4" 55' 1901.375 146? 3 .395 144.9 1901.38 145.6 2. '19 2.09 2.14 36 S. W. BUBNHAM 37 Noted as double, 160" : 2', in the Albany A.G. Not in any double-star catalogue, and no other measures. Pritchett. D.M.(36')2640. 9 ... 9 E.A. = 15" 40= 12 s ) Decl. = +35 59' J 1901.359 44?4 4^46 .395 46.0 4.58 45.2 4.52 1901.38 Discovered by Pritchett, who found 45?1 : 3 '94 (1881.52) In. No other measures. Skinner. S.D.(16)4169. 8.5 ... 8.7 R.A. = 15"45">32 S Decl. = - 16 52' 1901.455 275 2 2?02 .471 273.0 2.00 2.01 1901.46 274.1 Noted as double by Professor Skinner at the Naval Observatory. No other measures. H 1281. L 28977. 7.1 . . 11 1901.280 .299 R.A. = Decl. = - 15 41 230? 9 231.3 34^43 34.38 34.40 1901.29 231.1 H estimated 215 : 18" : 6-7 ... 20. The only other measures are 229?8 : 35-'12 (1890.36) In ft. W XVI. 2. 8.4 ... 9.2 R.A. = 16" 2 m 27 ! Decl. = +20 42' 1901.356 224? 6 .375 224.9 12^12 12.22 1901.36 224.7 12.17 In Weisse "duplex 12"." No other measures. S2017 R.A. = 16 h 6 m 37 s ) Decl. = + 14 52' \ 1900.455 252?9 26^64 .458 252.8 26.55 1900.45 252.8 26.60 Perhaps a small change in distance. S found 25 '03 (1831.42), and A 25-95 (1867.65). S 2018 rej. S.D.(7 )4234. 8.4 . . . 9.1 R.A. = 16" 7 Decl. = 7 10 s / 7 20' f 1901.359 355?3 19'51 .375 355.8 19.36 .455 355.0 19.60 1901.39 355.4 19.51 No other measures. Identified as above. S 2019 rej. S.D.(10)4276. 8 ... 9.2 R.A. = 16 " Decl. = 1900.455 152? 7 22^48 .458 153.0 22.25 . = 16" 7">42 S i 1. = - 10' T \ 1900.45 152.8 22.36 The only other measures are in the Washington Observations of 1862, 109?2 : 19-11 (1862.7). This may be another star. S 2031 rej. D.M.(-1)3761. 7.6 ... 9.7 R.A. = 16 h 10 ra 9 s / Decl. = 1' 21' f 1901.359 230?2 20.'80 .395 229.5 20.85 .416 230.0 20.66 1901.39 229.9 20.77 No other measures; Class IV in 2. The principal star is L 29649, and has a proper motion of O'lOo in 270. 1901.37 71.8 26.67 No other measures. S 2081 rej. L 30416. 7.8 ... 10.5 RA. = 16" 37" 4 s i Decl. = + 3' 41' i 1901.375 321? 9 21 '31 .41^4 322.2 21.40 Decl. = - 6 ; 19' \ A and B 1900.455 91?4 10.'07 .458 89.8 10.25 1901.433 87.7 10.39 1901.39 322.0 21.35 A more distant companion of about same magni- tude, 178?2 : 42 '3. No other measures. 2 2093 rej TI Herculis 3 12 1900.78 89.6 10.24 A and C (C = 14.5) 1900.455 134? 8 13-55 .458 140.4 13.22 RA. =16" 38 -47 s ) Decl. = +39 : 9 $ 1901.337 262? 2 114 '27 .356 262.2 114.27 1900.45 137.6 13.38 Simply described in H as " triple Classes I and II." There is a 10m star, 234?3 : 73'2. 22062. 8.4... 10.5 RA. =16" 28-" 42*) Decl. = + 8 56' \ 1900.458 lll?o 2^55 551 113 6 2 50 1901.34 262.2 114.27 Principal star round. The only measures of the small star are 261?1 : 113'39 (1879.27) In ft. Skinner. S.D.(17')4630. 8.4 ... 8.5 RA. = 16" 39 20 s ) Decl. = - 17 8 \ 1901.455 86? 7 3-'46 .473 85.5 3.69 IfW^I t(> Oi? I Q X7 1900.50 112.5 2.52 The only measures since 1857 are my own in 1880.' There is no change. Young. D.M.I 58=)1646. 8.2 ... 9.5 R.A. =16 h 29">26 s ) Decl. = +58 1' J 1901.375 216?5 L'30 iyui . io oo .1 o . o i Discovered by Professor Skinner at the Naval Observatory with the meridian instrument. No other measures. H 1294. L 30509. 7 ... 12.5 RA. = 16 h 40 m 56 s ) Decl. = - 24= 19' J 1900.455 131? 3 24^95 1901.433 132.3 25.03 .433 214.9 1.48 1900.94 131.8 24.99 1901.40 215.7 1.38 Discovered by Professor Young, 219?5 : 1'59 (1883.76) In. No other measures. H gives 135" ~ : 18'^ : 7 ... 17 ; " large star red." To me it appeared yellow only. 39 40 MEASURES OF DOUBLE STARS S 3108 rej. L 30945. 8.4 ... 9.0 R.A. = 16"55 m 43 s / Decl. = - 11 43' \ 1901.455 124?8 39^60 1902.219 124.7 39.73 The previous measures of this pair are very dis- cordant in distance, but there is probably no change since S, who found 23?2 : 7M7 (1830.15). 1901.83 124.7 39.66 No other measures. Howe. S.D.(10)4619. 8.7 ... 12.7 R.A. = 16 h 56 m 41 s ) 50 1 ) Decl. = - 26 18' j 1901.38 57.5 52.62 H gives for the angles 20?7 and 60?5 (1828). 1901.375 226? 2 10^26 .433 226.7 11.04 .452 226.5 10.56 2 2189 rej. 7.9 ... 105 ... 8.6 RA. = 17" 29" 37 s ) Decl. = + 47" 58' ) A and B 1901.356 100?5 20-'88 .375 100.0 21.06 .433 99.4 21.27 1901.42 226.5 10.62 No measures. H gives 330 = : 12' (1834.3); probably error of 100 ; . There is a 13m star 5-4: 22^9, and 12.5m at 61 ?4 : 27 .'2. 22230 RA. = 17" 44 54 s ) Decl. = + T~ 57' \ 1901.39 100.0 21.07 AandC ana 15 1900.458 108? 8 37^52 .515 109.1 37.72 1901.356 359?6 65'11 .375 359.2 64.96 .433 359.9 65.06 1900.48 108.9 37.62 A and C 1901.39 359.6 65.04 iyU0.4Oo 83-2 4o-4o .515 84.3 45.50 A and C are D.M.(48')2532 and 2533. The only measures of AB are 985 : 20-'58 (1900.53) 2u Espin. Hd Zones 1900.48 83.7 45.47 B and C 1900.458 2085 19'26 .515 211.0 19.05 RA. = 17" 32" 14 s ) Decl. = + 56' J Noted as " double " in Harvard Zones. The place is that of the 9.2m star, DJI^O)3739. It is not double. Skinner. S.D.(15>4651. 8.5 ... 9.0 R.A. = 17" 35- 20 s > Decl. = - 15 40' \ 1901 512 275 8 4^33 1900.48 209.7 19.15 The principal star has a small proper motion of about 0'017, which increases the distances of both companions. H 4995. L 32695. 6.7 ... 11.7 RA. =17" 47" 26 s < Decl. = - 11 19 \ 1900.551 154? 6 28^60 1901.263 156.1 28.48 .586 276.0 4.29 1900.96 155.3 28.54 1901.55 275.9 4.31 Discovered by Skinner with the meridian circle of the Naval Observatory. It is also Hussey 184. 2 2195 rej. 9 ... 9 R.A. = 17 "SB" 13 s ) Decl. = + 2r 13' \ 1QO1 .11.1 iniQ 91 'Kf\ H has 140 : 18'; "a third, closer, suspected." Neither this telescope nor the 18^-in. in 1878 showed any other companion. OS (App) 160. 8.2 ... 8.6 RA. = 17 h 4746 s ) Decl. = +10 ; 59 ' ) 1900.458 190? 8 102^30 .476 191.0 102.14 .416 101.0 21.61 1900.46 190.9 102.17 1901.41 101.1 21.60 No other measures. In the field 2 ' or 3 p 2 2196. did not nnd this, and there are no other meas- ures. The components are D.M.(10')3315 and 3314. The A.G. positions give 191 ?6 : 100'87. 41 42 MEASURES OF DOUBLE STARS Holden. L 32716. 1900.551 .553 R.A. = 17 h 48 m 13 s Decl. = - 11 37 154? 3 150.0 6.7 ... 12 s ) ' \ 1900.55 152.1 3?51 3.56 3.53 Discovered by Professor Holden at the Washburn Observatory. Unchanged. Bird. O.Arg.N.17688. 9 ... 10.5 ... 9 R.A. = 17 h 52 m 55 s Decl. = + 67 A and B 55 s ) 1' \ 1901.375 .433 1901.40 1901.375 .433 325? 4 326.3 325.8 A and C 328? 5 328.6 1901.40 1901.375 .433 1901.40 328.5 BandC 333? 5 331.9 332.7 1K83 11.65 11.74 22^28 22.40 22.34 10.'28 10.35 10.31 The wide pair AC " duplex " in O.Arg. The faint star between discovered by F. Bird in 1869. The only other measures are mine in 1879. 22253 R.A. = 1752 m 55 s Decl. = +14 38' 1901.203 78?4 .225 78.2 1901.21 78.3 Distance slowly decreasing. OS (App) 161 R.A. = 17"54 m 29' s Decl. = + 8 52' 15^22 15.50 15.36 1901.375 .436 .471 76? 7 77.2 76.8 62 .'36 62.20 62.27 1901.43 76.9 62.28 The only other measures are by J, 77?9 : 62?70 (1874.98) 3n. W XVII. 1120 R.A. = 17>'55 m 22 5 ) Decl. = - 14 30' \ " Duplex " in Weisse. This is S.D.(14")4860, 8.7m Not double, and no near companion. S 698. L 33058. 7 R.A. = 17 h 56 m 57 s Decl. = - 22 30 1900.551 316? 1 1901.263 317.0 . 8 s ) ' \ 29 '70 29.52 1900.90 316.5 29.61 , No other measures since South, 317?4 : 30-'92 (1825.51) 2n. There are many stars in the field, and several nearer than B. H 5013. S.D.(15")4801. 9.7 ... 11.7 R.A. = 17" 57 "> 38 s Decl. = - 15 5' 1901.455 338?4 13-'31 .529 338.6 13.53 1901.49 338.5 13.42 The only observations by H, 339 : 4" : 9 . 13. A.C. 15. 99 R.A. = 18 h 2 m 28 s Decl. = +3023' 1898.269 .271 .463 317?5 322.4 320.8 1898.33 320.2 l."04 1.21 1.19 1.15 Perry. 10.2 . . . 11.0 R.A. = 18 h 3'" Decl. = + 920' 1900.551 313? 1 3^28 1902.433 313.1 3.37 1901.49 313.1 3.32 Not in D.M. It is about I"/ D.M.(9)3565. The only other observation is 305?0 : 2^0 (1881.38) Perry. Alvan G. Clark. 102 Herculis. 5J . . . 12.9 R.A. = 18 h 3 38 s Decl. = + 20 48' 1900.458 135? 9 23^66 .473 135.6 23.72 1901.455 136.5 23.28 1900.76 135.7 23.55 42 S. W. BUBNHAM 43 The only prior measures are mine, 136? 7 : 23 '42 (1878.45) In. This angle is erroneously printed 46?7. The proper motion of A is small, 0'015 in 212?9. 22285 R.A. = 18" 3 m 45 s ) S2291 R.A. = 18" 5 m 53 s ) Decl. = +34 ' \ 1900.473 339? 3 27 '01 1901.299 339.0 26.85 .320 339.4 26.53 JJecl. -j- lo ^o ) 1900.458 333?6 3-50 1901.203 333.2 3.45 1901.03 339.2 26.80 No recent measures. Distance increasing ? 1900.83 333.4 3.47 Without change. No late measures. H 593. S.D.(17)5052. 8.2 ... 11.5 ... 9.5 R.A. = 18" 3 m 48 s ) Decl. = - 17= 10' ) AandC 1901.455 303?4 18fl5 .512 301.1 18.08 1830.73 339?2 25'12 2K S 1868.02 339.2 25.90 4K J H 1821. S.D.(16)4755. 9.2 ... 9.6 R.A. = 18" 5 m 54 5 ) Decl. = - 18 20' J 1901.529 278? 8 TOO 1902.433 278.0 7.62 1901.48 302.2 18.11 A and B (= Hussey 195) 1901.512 75?8 1'14 Close pair discovered by Hussey in 1900. No other measures of H 593 except Glasenapp, 300?9 : 1901.98 2/8.0 /.81 Hhas273?6:4' (1828). A and S.D.(16)4756 1901.529 13? 6 53^07 1902.433 13.4 53.25 17^26 (1890.54) 2n. H 5030. L 33330. 6 ... 10.8 R.A. = 18" 4 m 24 s ) Decl. = - 23' 44' \ 1901.263 287?3 4U65 .586 287.3 42.24 1901.98 13.5 53.16 9 V. 93. D.M.(28)2955 and 2956 R.A. = 18" 8 m 17 s ) Decl. = +28 3 13' \ 1901 203 1S64 'vt'Q? 1901.42 287.3 41.94 .225 136.4 54.43 The only other measure is : 1834.3 281?0 30" IK H H 2820 9.5 ... 10.7 . . . 10.8 1901.21 136.4 54.70 The only measures are : 1783.65 135? 7 47^77 IK ? R.A. = 18 h 4 -"45 s ) Decl. = - 18 26' I A and B 1901.455 279?3 5^58 .529 278.3 5.72 1880.40 136.4 54.88 3n ft The Weisse meridian positions give 132?9 : 54 '10 (1825). Bigourdan has measured another pair, or the distance is erroneous. 1901.49 278.8 5.65 A and C 1901.455 82? 7 12 -'87 .529 83.8 13.10 H 857. W 1 XVIII. 192. 8 ... 11 R.A. = 18"10 m 53 s ) Decl. = 7 20' J 1901 452 203 21 '49 1901.49 83.2 12.98 .509 19.6 20.92 The principal star is S.D.(18)4826. The only other observations by H, 281?9 : 3"; 90?0 : 8' (1830). 1901.48 20.0 21.20 No other measures. H estimated 20" : 15" (1820). 43 44 MEASURES OF DOUBLE STARS H 5494. B.A.C. 6213. 6 ... 11.8 R.A. = 18 h 13 m 20 s ) Decl. = + 7 12' \ 1901.416 69? 5 39W .509 70.0 39.79 .512 70.0 39.60 S 2332 rej. 9.2 ... 11.2 R.A. = 18 h 24 m 42 s ) Decl. = + 64 50' \ 1901.433 262? 5 10^71 .436 263.7 11.89 .452 262.3 10.93 1901.48 69.8 39.49 Only the estimates of H, 65 : 45" : 5 ... 15 (1827.6). 0. Stone R.A. = 18" 16 : ) Decl. = - 18 55' \ Given in Gin 6 with this place, 84?6 : 6 '72 : 8.5 ... 9.0 (1879.30). No such pair in or near this place. A 1901.44 262.8 11.18 No other measures. Not in D.M., but near D.M. (64)1267, the place of which is given here. Schjellerup. D.M.(7)3741. 8.9 ... 9.0 R.A. = 18 h 27 ra 49 s ) Decl. = + 7 21' i 1901.509 197?7 46^02 .512 197.6 45.64 nothing answering this description (1901.452). The place is certainly erroneous. S2311 R.A. = 18 h 16 m 38 s ) Decl. = +11 23' J 1900.512 158?8 5^65" .515 159.1 5.72 1901.51 197.6 45.83 From list of new pairs in A.N. 1485, the distance given 34". No other measures. Both stars in D.M. There is a 13.5m star from A, 119 : 14 '5. S 2340 R.A. =18"28 ra 30 s ) Decl. = +31 30' \ 1901.433 103? 9 23 '02 1900.51 159.0 5.68 The motion appears to be rectilinear. .436 103.3 23.20 .452 103.7 23.06 1830.30 170?7 8f65 4n 2 These positions give for the proper motion of A 0:047 in 191?2. H 5496. L 34034 R.A. = 18" 20- 40 s ) Decl. = - 8' 7 ' \ Given in H as 6m star, " suspected double with 180." I could not see any companion with the 6-in. in 1876, nor with the 40-in., 1901.455. 1901.44 103.6 23.09 The change appears to be due to a small proper motion of one of the stars. 1830.43 104?6 21 ^51 Bn 2 OS 356 re/. L 34475 R.A. = 18" 29 20 s ) Decl. = +40 4' \ 1900.473 305? 9 36 .'11 1901.225 306.2 35.98 9 N. 125. L 34048. 8.0 ... 8.1 R.A. = 18" 21 33 s I Decl. = -25 7 ' \ 1901.551 281? 3 2T67 .647 282.2 2.75 1900.85 306.0 36.04 Distance slowly decreasing from proper motion. Other recent measures by Hussey. S2345 R.A. =18" 30 23= ) 1^/i^l - 1 W\o CQ ' f 1900.60 281.7 2.71 No measures by 9> given as Class I. The follow- 1901.436 203?8 8^58 .452 204.0 8.53 1889.77 99?0 U62 In Ho 1897.70 101.8 3.14 2n See 1901.44 203.9 8.55 Rectilinear motion. Sfoundl85?l:7'38(1832.25)4n. 44 S. W. BUKNHAM 45 S2346 RA. =18"31-27 S ) DecL = + 7 26' \ 1901.471 291?8 2\'Yl .586 291.2 21.19 9 IV 59 = S 2354 rej. 8.5 ... 9.0 RA. = 18" 32" 45 s [ Decl. = +38' 38' \ 1900.473 302?1 29'52 1901.225 302.7 29.40 1901.53 291.5 21.18 The motion is rectilinear, distance and angle increasing. 1829.64 282?9 15 .'41 4 2 These measures give for the proper motion of A 0^091 in 132?5. S 2353 rej. D.M.(58)1823. 8.5 ... 11 1900.85 oOJ.4 29. 4b Near Vega. The only other measures are : 1783.81 303?9 22'33 In f 1880.42 303.6 29.80 2n ft S 2350 rej. L 34569. 6.7 ... 11 RA. = 18" 33- 30 s ) Decl. = - 1 54' \ 1901.395 196?4 22^16 .452 196.1 22.18 RA. =18" 31" 36 s ) Decl. = +58 41' \ 1901.299 258? 5 13'98 .318 258.8 13.76 1901.42 196.2 22.17 The only measures are : 1848.64 194?8 24^54 In Mitchell 1880.02 196.8 23.27 2n ft 1901.31 258.6 13.87 The only measures of this are found in the intro- duction to Metis. Microm., 258?7 : 13^2 (1832.8). D.M.(58 C )1824, which is 4-'4s, is a similar pair with a little less distance. S 2365 rej. 8^ ... 10.0 RA. =18 h 34 m 21 s ) Decl. = -f 63 36' \ 1901.433 26? 1 19^58 .436 24.5 19.84 O.Arg.S.18506. 8 ... 8.4 ... 103 RA. = 18 h 32 m 28 s ) Decl. = -25 37' \ A and B 1901.529 216? 9 7-'36 1902.449 217.1 7.22 1901.43 25.3 19.70 No other measures. The principal star has a proper motion of 0'282 in 193?2 (Porter). The movement in A.G. is 0'306 in 189?3. This is D.M. (63)1439 (= Groombridge 2630). H 1336. 8^ ... 11.5 ... 11 RA. = 18" 35 52 s ) 1901.98 217.0 7.29 AandC 1901.529 285? 7 53^27 Decl. = + 30 11 ' \ A and B 1901.263 87 ?4 17. '59 .302 86.7 17.62 1902.449 286.3 52.97 1901.28 87.0 17.60 1901.98 286.0 53.12 A andD 1901.529 217?4 80-'78 1902.449 217.9 80.14 A and C 1901.302 176?7 32-'25 The only other observation is by H, 89?0 : 8'db; 300=:15' (1828). There is another llm star, 295?9:32r6. 2 2367 is 47/. 1901.98 217.6 80.46 Noted "duplex" in O.Arg.S. and "triple" in Washington Transit Zones. The first measures from Washington Observations, 1862, do not agree with the present positions : 1862.8 212? 8 7 '47 1862 8 285 2 68 66 Ho 437 RA. =18 h 35 m 58 s ) Decl. = + 31 32' \ AB and C 1901.436 272? 1 39^61 .452 273.2 40.02 1862.8 218.5 79.02 1901.44 272.6 39.81 45 46 MEASURES OF DOUBLE STARS CandD 1901.436 335? 8 3^08 .452 336.5 3.48 H 1353. D.M.(11)3654. 9.0 ... 9.6 R.A. = 18" 48- 42 s ) Decl. = +11 9' \ 1901.44 336.1 3.28 Seeing too poor for AB. 1901.359 208? 8^41 .397 206.6 8.26 H 1337. D.M.(31)3330. 9.0 ... 11.6 R.A. = 18 h 36 m 22 s ) Decl. = +31 28' \ 1901.436 162? 4 9?08 .452 162.5 9.00 1901.38 207.3 8.33 The only measures are : 1828+ 212?2 5" In H 1879.45 208.1 8.41 2n Gin Howe (Gin 5 ) has a close pair in this place, 209? 1 : 0'94 (1879.31) In. There is no close double here, 1901.44 162.4 9.04 Observations of H only: 1828+ 174?9 6" In D M.(45)2667. 8.9 ... 12.5 . . . 9.9. and it is undoubtedly an error in reading or printing the distance. Lewis R.A. = 18 h 41 m 12 5 ) Decl. = + 45 43' \ A and B 1901.263 132?4 2.' 66 .299 131.7 3.15 .302 132.0 3.02 R.A. = 18 h 50 m ) Decl. = +34 30' \ This pair has the above place for 1900 (Mon. Not., LX, 510) with the following measure : 1899.44 84?6 5fl3 8.0 ... 10.0 In The place is substantially identical with that of the 79m star DM(34")3346 This star was exam- 1901.29 132.0 2.94 AandC (=H1346) 1901.263 216? 8 24 .'38 .299 216.1 24.28 .302 216.4 24.45 ined on two nights, and the stars in the vicinity as well, but no pair found to answer the description. 0647 1901.29 216.4 24.37 B is not in H, and was first noted by Espin (A.N. 3717), who found 135?9 : 2f73 (1900.62) 2n. $ VI. 50. 6.4 ... 12.5 ... 8 R.A. = 18 h 50 m 29 s ) Decl. = +13 27' \ A and B 1900.512 16? 1 If 07 .515 14.6 0.87 R.A. = 18" 43* 15 s ) Decl. = - 6 3' I A and B 1901.397 359? 4 22f83 .452 360.3 23.30 1900.51 15.3 0.97 AandC 1900.512 217?3 19f01 .515 217.6 19.03 .471 361.2 23.49 1900.51 217.4 19.02 1901.44 360.3 23.21 AandC 1901.397 170?6 113?75 .452 171.0 113.53 .471 170.7 113.98 Change in the distance of C is confirmed by these measures. p648 R.A. = 18" 52 30 s / 1901.44 170.8 113.75 The small star B was first noted with the 6-in. The only measures are : 1879.37 356?8 22-'53 In ft 1879.35 170.5 113.98 2n ft Decl. = +32 45' \ 1900.473 215?3 U24 .553 225.6 1.40 .703 229.9 1.37 1901.203 218.3 1.07 A and C are S.D.(6)4922 and 4923. 1900.73 222.3 1.27 46 S. W. BURNHAM 47 H 1357. D.M.(45=)2799. 8.0 ... 10.5 R.A. = 18 h 53 m 34 s ) Decl. = + 45 42' \ 1901.433 213?2 26-'75 .452 211.9 26.92 H 2852. D.M.(7)3943. 9.1 ... 9.9 R.A. = 18 h 57 m 16 s ) Decl. = + 7 14' \ 1901.512 131?2 22'63 .586 131.4 22.41 1901.44 212.5 26.83 The only prior measures are : 1828+ 2108 16' In H S2427 R.A. = 18 h 53 m 57 s ) Decl. = +38 i'\ A and B 1900.473 61? 3 48 '54 itim *K Ai Ati F;C; 1901.55 131.3 22.52 H called the components red : blue-green; 134-5 : 18' : 10 . . . 12 (1830). 22442 R.A. = 18" 58 20 s ) Decl. = +16 48' \ 190]. 299 207?5 18?37 .703 205.4 18.20 1901 50 206 4 18 28 1900.85 61.5 48.54 BandC 1900.473 79? 3 7^04 1901.225 78.9 7.32 The distance is decreasing, with no sensible change in the angle. These measures with those of 2 indicate an annual movement of A of 0'06 in the direction of the smaller star. In the course of some 1900.85 79.1 7.18 No change in BC, but the distance of AB is in- creasing. A comparison of these measures with S's gives for the proper, motion of A 0'064 in the direc- tion of 41. A.G.C. 9. y Lyrae R.A. = 18 h 54 m 27 s ) three hundred years these stars will make a close pair. 9 V. 33. 15 Aquilae. 6 ... 8 R.A. = 18 h 58 m 38 5 ) Decl. = 4 13' J 1900.458 208?4 37 -'05 .473 208.2 37.42 Decl. = + 32 31' J 1900.515 298?9 12^87 .551 299.9 12.91 1901.210 300.1 12.69 1900.46 208.3 37.23 The proper motion of A is very small, 0'014 in 300?3. The distance of JJ in 1781 of 33 -'88 is cer- tainly too small. 1900.76 299.6 12.82 H 874. 7.1 ... 13.3 . . . 11.7 RA. =1854">35*> Decl. = - 37' f A and C H 5507. 6 ... 12.2 R.A. = 18"58 m 49 s ) Decl. = - 15= 50' \ 1900.458 63?0 47^10 1901.397 63.3 46.76 1901.390 oU4-2 23-01 .397 304.6 22.92 .455 303.9 22.94 1900.92 63.1 46.93 H only estimated the angle 50'(1823.6). There is 1901.41 304.2 22.96 A and B (new) 1901.395 2?4 9.'30 .397 0.4 10.05 .455 359.0 9.74 a 14m star about the same distance in 94?8. H 1364. D.M.(44)3051.' 9.4 ... 9.4 R.A. =18 h 59 m 36' ) Decl. = + 44 17' \ 1901.41 0.6 9.70 Xo other measures. H estimated 305 : 15". The 1901.452 204? 7 3 '13 1902.433 207.7 2.98 principal star is W XVIII. 1351. 1901.94 206.2 3.05 47 48 MEASURES OF DOUBLE STARS Described by H, " a most elegant double star ; chief of a small cluster." The only observations are: 1828+ 204?5 l' In H 1881.45 206.9 3.26 3n /3 H 1365. D.M.(26)3443. 9.5 ... 11 H 1374. L 36113. 8.0 ... 11.7 . . . 13.5 R.A. = 19" 6 34 s ) Decl. = + 44 22' \ A and B 1901.263 115? 1 14?28 .318 114.3 14.41 R.A. = 19 h 22 s ) Decl. = +26 57' \ 1901.452 326?6 20?67 1902.219 325.1 20.04 1901.29 114.7 14.34 A and C 1901.263 5?i9 31-34: The description in H is 110?3 8"-t-- 350 + 15"-*-. 1901.83 325.8 20.35 H has 327?5: 15" (1828), and calls the colors ruddy : green. H V. 103. L 35845. 8.0 ... 8.3 R.A. =19" I" 42 s | D ec l _|_ 35 42' \ Schjellerup. 8.5 ... 8.8 R.A. = 19" 6 40 s ) Decl. = - 3 45' i 1901.452 230? 4 61? 16 .455 230.2 61.02 1901.225 55? 3 55?66 .299 55.5 55.62 1901.45 230.3 61.09 From list of double stars in A.N. 1485. The esti- 1901.26 55.4 55.64 The only measures are : 1783.63 60? 6 45?53 In H 1840.83 55.6 54.58 In OS 1866.68 55.5 55.08 In OS S 2463. D.M.(45)2831 R.A. =19" 2 m 30' ) Decl. = + 45 38' I mated distance is given 48 . The components are S.D.(3)4513 and 4511. Madler 7 = Ho 446 R.A. = 19" 7 m 43 s ) Decl. = +24 23' \ A and B (new) 1901.433 292? 4 2?79 .473 288.6 2.56 .512 291.0 2.82 A and B 1901.529 5?1 9?44 .605 5.7 9.49 1901.47 290.7 2.72 AandC 1001 41 fi 50 5 '01 1901.57 B.4 9.46 AandC 1901.529 283?0 23?52 .433 50.6 5.01 .473 45.2 5.21 .512 48.8 5.17 .605 282.4 23.96 1901.46 48.6 5.10 1901.57 282.7 23.74 C not in 2 ; first noted by H, who gave the angle 279?9 and 286?4 (1828). No other measures of this. S 2477 rej. 8.5 ... 10.5 R.A. = 19 h 6 m 2 s ) Decl. = - 4 40' \ 1901.452 47?4 28?08 .455 46.3 27.87 .471 45.9 27.92 B is new, but previously seen by Aitken. The measures of AC are : 1843.63 58?3 8?69 In Ma 1893.67 45.4 5.69 3n Ho The principal star is W 2 XIX. 193. H 2858. 9.2 ... 12.2 R.A. = 19 h 8 m 46 s ) Decl. = + 22 38' \ 1901.436 257?4 18?99 1901.46 46.5 27.96 1902.219 257.9 19.06 The only prior measures are : 1848.65 45?3 30'10 In Mitchell 1901.82 257.6 19.02 Hgives257?6:6' (1830). 48 S. W. BUBNHAM 49 H 2859. 9.2 ... 13 RA. = 19" 8" 47 s ) Decl. = +22 40' \ 1901.436 28T3 10^87 1902.219 28.8 11.53 OS (App) 178. 6 ... 7.5 RA. = 19" 9 52 s > Decl. = + 14 53 \ 1900.684 267?8 89^91 .687 267.4 89.83 1901.82 28.5 11.20 H gives 19?0 : 4' (1830). The relation of H 2858 and 2859 is 10?2 : 132-'70 (1901.43). H 1377. L 36224. 7.0 ... 12.9 RA. =19" a- 51 s ) Decl. = +47 10 $ 1901.436 356?5 36^33 .605 357.1 36.35 1900.68 267.6 89.87 The following are all the other measures : 1856.60 86?7 -80-'84 In Se 1875.61 267.8 89.65 4u J The change is not confirmed. The distance of Secchi is an error or misprint. The A.G. positions give 268?0 : 89 '68. The components are L 36207 and 36203. H 2862. 1 Vulpeculae 1901.52 356.8 36.34 The onlv other observation is by H, 3570 : 30" 7 ... 16 (1828). RA. = 19" 11" 3 s ) Decl. = + 21= 11' \ 1901.416 13?2 38^86 .512 12.6 39.16 .586 12.8 39.08 H5101. 8.5... 9 R.A. = 19" 9" 2* ) Decl. = -25 33 ' \ 1901.586 306?3 21?32 .720 306.9 20.97 1901.50 12.9 39.07 The only other measure is by H : 1830+ 10?6 25' : 5-6. ..17 There is a 13m star, 158?2 : 43^5. 1901.65 306.6 21.14 Both components in Cord.D.M. as Nos. 13881 and 13879. H found 311?5 : 20' (1837.2). H 1376. 8.0 ... 11.2 H2863. B.A.C.6590. 6.2 ... 11.7 RA. = 19 h 12 m 10 s \ Decl. = - 15= 44' \ 1900.458 16?0 45^96 .551 16.6 45.67 Decl. = + 15 10' i 1901.416 121?6 KK16 .471 123.6 10.14 1900.50 16.3 45.81 H gives 14?6 : 15' 6 . . . 15 (1830); "a third np very strongly suspected." I could not see any third 1901.44 122.6 10.15 Hgivesl20?4:6"(1828). OS 366 rej. 7.5 ... 9.2 RA. = 19* 9 48 s ) Decl. = + 34 Q'\ 1901.471 230?2 22^14 .589 229.6 21.74 nothing now. The principal star has a proper mo- tion of 0'293 in 204?7. H 266. 10^ ... 10.6 RA. = 19" 13" 8 s ) Decl. = 1" 47 \ 1901.529 266?2 14T57 .586 265.1 14.55 1901.53 229.9 21.94 Without change. The principal star is L 36242. Two faint stars s and sf. 1901.56 265.6 14.56 This is not in the D.M., but is closely /D.M.(-1) 3706. H has 265 : 5' (1820); "a suspected stel- 49 50 MEASURES OF DOUBLE STARS lar nebula in the field." The 40-in. shows this as a double nebula, with the appearance of belonging to the planetary class. It was rediscovered by Marth, BandC 1901.471 236?7 10^48 .586 239.2 10.46 and is No. 6(78 of Dreyer. 2 2494 rej. 7.4 9.5 R.A. = 19"13">36 S ) Decl. = ' - 6 51' f 1900.458 81U 25f26 1901.703 81.2 25.33 1901.53 237.9 10.47 No other measures. The principal star is D.M. (9)4075. S2501 R.A. = 19 h 15'M2 s ) Decl. = - 4 58' \ IQAI Aff> OO A 1Q'89 1901.08 81.1 25.29 .455 21.7 20.05 There is an error of 180 in the angle of the only other measure : 1848.65 256?2 26^59 In Mitchell S 2500 rej. D.M.(19)3976. 8.0 ... 10.5 R.A. = 19 h 'l4 m ll s ) Decl. = + 19 30' \ 1901.416 24?|3 19^74 .586 23.2 20.06 1901.45 22.0 19.93 Without change. There is a 13.5m star from A. 108?3 : 9. '6. S 2506 rej. 8.7 ... 9.1 R.A. = 19 h 16 m 14 s ) Decl. = + 14 8' \ 1901.589 350?5 16^63 .720 351.2 16.60 1901.50 23.7 19.90 No other measures except angle by H, 23?0 (1830). The A.G. proper motion of A. is 0^062 in 280?2. The 6.8m star, distant about 10'sp, D.M.(19)3975, is said to be an Algol variable, the magnitude de- scending to 9m, with a period of about 17 days (A.N. 3748). OS (App) 180. L 36460. 7.7 ... 8.0 R.A. - 19 h 15 m ll s ) Decl. = +14 12' \ 1900.684 266?5 80^40 AO 1 ? O Q OH Of\ 1901.65 350.8 16.61 Rejected by 2 as not subsequently found. Evi- dently fixed. A is D.M.(14)3888. The only meas- ures are : 1843.60 170?9 16^33 In Ma 1875.01 351.3 16.43 2w J Glasenapp. S.D.(14)5425. 9.0 ... 9.5 R.A. =19" 18- 2 s ) Decl. = - 14 52' \ 1901.605 68U 24^33 1902.449 66.7 24.28 . Do 1 /DO . O OU . ZU 1902 03 67 4 24 30 1900.68 266.4 80.30 The only measures are : 1874.98 266?3 80?22 3n A H 884. 7.5 . . . 10.9 . . . 11.0 R.A. =19 h 15 m 28= ) Decl. = + 9 36' \ A and B The only other measures are : 1890.54 69?2 23^99 2n Glasenapp Schjellerup. 8.2 ... 9.2 R.A. = 19 h 19-33 s > Decl. = + 4~ 36' \ 1901.589 214?0 4U24 .720 214.2 41.18 1901.471 299? 2 45f05 .586 299.7 44.59 1901.65 214.1 41.21 From list of new pairs in A.N. 1485. No other 1901.53 299.4 44.82 measures. A is D.M.(4)4096. 50 S. W. BURNHAM 51 S 2517 rej. D.M.(22=)3687. 8.7 ... 9.7 RA. = 19 h 19 n '40 s Decl. =- + 22" 32' 1901.589 138?6 15.'85 .760 138.5 15.88 s i ' \ 1901.67 138.5 No other measures. 0. Stone 15.86 . = 19 h 20 m : ) l. = - 16 11' \ RA. = 19 h 20 m : Decl. Given in Cin 5 , 195?4 : 4-'84 : 6.8 ... 13 (1880.62) In. I could not find any such pair in or near this place. There is no bright star here in the S.D. H 2871. 4 Vulpeculae. 6 . RA. = 19 b 2012 s ) ' \ 1901.473 .512 1901.49 Decl. = +19'34' 106? 5 106.3 106.4 11.0 24-'89 24.89 24.89 H gives 110?4 : 30" (1830); "two more near; one extraordinarily faint." There is a star of about the same magnitude in 197?9 at about double the dis- tance, and a 13.5m star, more distant, in 231 ?4. 1901.416 .433 1901.42 v Aquilae RA. = 19" 20-" 23 s Decl. = + O 5 6 287?9 288.2 I 200-50 200.74 288.0 200.62 Measured in looking for 9 1^- 34. which is about 3 m f. B is D.M.(0 )4204. The proper motion of A is 0-'024 in a59.7 The A.G. positions give 288?6 : 201 -'4. Many small stars nearer A than this. 3 Cygn i. 6.5 ... 10.4 RA. =19" 20"- 28 s Decl. = +24 32 1900.515 78?3 30-'94 .553 76.9 30.47 1901.473 76.2 30.21 1900.85 77.1 30.54 The principal star has a large proper motion, 0'658 in 198?1 (Berlin A.G.). The only other measures are by OS, the first of which is : 1866.72 122?8 27 -'91 In OS ?N. 119. 6... 8.2 RA. = 19 h 22 m 27 s ) Decl. = -27 14' \ 1901.455 .509 1901.48 141? 9 141.3 141.6 7-65 7.87 7.76 No measures in 9. There is an error of about 23' in his Decl. The measures of this show no change. It was measured by me in looking for No. 153 of the Harvard list, which has an error of about 3 m R.A. and 10' in Decl. It is identical with the $ pair. H 887. L 36791. 7.0 ... 13.2 RA. = 19 " 22 m 54 s / Decl. = - 7 17' ( 1900.473 .476 348?7 348.7 35^54 35.08 1900.47 348.7 35.31 No other measures. H called the small star 20m. The principal star appears to be the variable U Aquilae. 9 IV. 33. 9.5 . RA. =19 h 23 nl Decl. = O 3 .. 9.7 9 s ) 0' \ 1901.433 .512 335?7 335.7 12-'96 13.12 1901.47 335.7 13.04 9 describes this as " the first of 2 stars p v Aqui- lae ; distance of the two nearest 21 '98, inaccurate." After a very careful examination, I am certain that the star which he calls v Aquilae is really the 6.9m star, D.M.(-0 )3760, which follows the other 2- 47 s . The description then applies perfectly This faint pair is not in the D.M. The place given above is that of the bright star. OS (App) 182. 6.9 ... 7.4 RA. = 19 h 23 m 37 s ) Decl. = +49 54' \ 1901.471 305?6 72^03 .529 305.8 71.69 1901.50 305.6 The only other measures are : 1874.62 307?3 71^79 71.80 3u 51 52 MEASURES OF DOUBLE STABS There is a 14m star from A 113?9 : 12M7 (1901.53) In. There is also a small nebula in the field ; from A in the direction ot 2473, and from B in 221 ?0. The principal star is given a proper motion of 0'085 in 54?3. A 20. 7 ... 10.1 ... 9.7 R.A. = 19"25 m 1 s ) Decl. = - 2 22' \ A and B 1901.589 65? 2 U48 .760 68.9 1.22 Discovered by Howe, but the place in Cin 5 is in error in both R.A. and Decl. The only measures are those by him in 1879, which show no motion. The principal star in D.M.(3)4079. ? V. 104. 7.3 ... 9.8 R.A. =19"30">55 S / Decl. = + 15 37' \ 1901.433 1266 39^08 .436 126.3 38.56 1901.67 67.0 1.35 .471 125.4 38.82 A and C (=22535) 1901.589 2987 25f98 .604 297.9 25.94 .760 298.7 25.90 1901.45 126.1 38.82 The place is a little uncertain in H. The princi- pal star is D.M.(15)3877. The magnitude in D.M. is 6.7. The only other measures, except position 1901.65 298.4 25.94 No material change. H 5128. 8.4 ... 10.1 . . . 10.3 R.A. = 19 h 26 m 36 s ) Decl. = - 18 52' \ A and B 1901.589 111?0 20^88 .604 111.4 21.08 angle of 1063 (1783.65), are : 1893.55 1249 39^27 In Bigourdan Sagittae R.A. = 19 " 31 m 51 s ) Decl. = + 16 12' \ 1901.433 819 89?78 .471 81.3 89.71 1901.59 111.2 20.98 .473 80.9 89.96 BandC 1901.589 125?5 4^29 .604 127.1 4.17 1901.46 81.4 89.82 As a wide pair this is $ VI. 26 = $ VI. 63 = N. 83 = S 721 = OS (App) 185. In # VI. 63 the angle 1901.59 126.3 4.23 No other measures of BC except an angle by H of 125?9 (1836.5). The single measure of AB of 1879 in Gin 5 shows no change. A and B are S.D.(18) 5413 and 5414. Howe. 8.8 . . : 10.7 . . . 10.1 R.A. = 19" 29 36 s ) Decl. = + 3 12' } A and B 1901.589 23?3 6^75 .742 25.6 6.81 is reversed. $ N. 83 is given 3 m p and 11s, but it is identical with this star. The A.G. proper motion of A is very small, 0'013 in 297?5. 1782.30 81?5 91 '87 In # 1800 79.9 87.86 Lalande 1870.2 81.1 91.57 A.G. 1875.61 81.3 90.68 in A H 1423. 9 Cygni. 6.5 ... 11.2 R.A. =19 h 32 ra 22 5 ) Decl. = +29 5' \ 1901.66 24.4 6.78 A and C 1900.473 127?8 20^85 .687 129.4 21.15 1901.589 306?7 32.'50 .742 305.6 32.29 1900.58 128.6 21.00 Only H 1363 12" -+- (1828) The proper motion 1901.66 306.1 32.39 is insensible, 0'021 in 158 5 (Auwers). 52 S. W. BUBNHAM 53 OS 379 rej. 8.0 ... 8.5 RA. =19" 33" 55' Decl. = +33' 38 ') ' \ 1900.703 1901.260 1900.98 Without change. 86?4 86.7 86.5 24?97 24.89 24.93 9 II. 32 = 9 N. 84. RA. = WSi" Decl. = + 16 18 1900.473 300? 9 .553 301.8 6.5 ... 8.6 0') 8' \ 1900.51 301.3 The only measures are : 1796.59 301? 8 27-20 1840.22 302.2 28.61 28 -'46 28.57 28.51 In $ 2 OZ H 2888. 45 Aquilae. 6.5 ... 13.7 1900.476 .515 1900.49 R.A. =19"34 m Decl. = - 354?2 355.4 54' 354.8 42^89 42.23 42.56 No observations except H, 354?5 : 30' : 7 ... 19 (1830). His description is : "A large star in a con- stellation of at least a dozen small ones within 2' distance; that taken forms with the large star a good representation of the Georgium Sidus and one of its satellites. It is a fair comparison in point of light." 0. Stone RA. = 19" 35 : Decl. = +37 55' The measures in Cin 5 are 224?1 : 5^06 : 9.5 ... 11.0 (1879.61) \n. I could not find anything in this vicinity to correspond with the description, though there are many faint pairs. One near this place is 64?7: 7-'54. S 2560 rej. L 37406- 7.2 ... 95 R.A. = 19 h 35 ra 34 s Decl. = + 23 26' 1901.605 .760 295?0 295.1 1901.68 295.0 No other measures. 15^12 15.48 15.30 H 895. 8.7 ... 10.5 ... 9.1 RA. = 19" 36- 46 s ) Decl. = + 58' \ A and B 1901.433 209?0 14?17 .473 205.8 13.99 .512 208.3 14.39 1901.47 1901.433 .473 .512 1901.47 16.8 28.53 C and D (new). C = 13.7 1901.433 125?1 4^66 .512 123.3 4.52 207.7 AandC 17?5 16.4 16.6 14.18 28'50 28.65 28.43 1901.47 124.2 4.59 No measures by H. He saw only the three brighter stars. A and C are D.M.(0)4283 and 4284. OS 381 rej. 7.2 ... 11.7 RA. = 19" 37 23 s Decl. = + 3 53 1900.476 5? 7 15?04 .515 6.5 15.16 .551 5.7 15.20 s > ' J 1900.51 Unchanged. 6.0 15.13 W XIX. 944 RA. = 19 h 37 m 56 s Decl. = + 4= 28 Noted "duplex" in Weisse. It is not double, although there are several stars in the field. The 7Jm star / has a 25' companion p. In the D.M. the Weisse star is (4 = )4205, and a 9.3m star, No. 4208, is 26*5/ and 2'2w. The difference in R.A. is now much less. OS (App) 190. 12. ... 12 ... 8.1 s ) "i RA. =19" 39- 50 s Decl. = +46' 57 A and B 1901.471 .509 1901.49 299?4 298.8 299.1 1U82 11.66 117.4 53 54 MEASURES OF DOUBLE STARS AandC 1901.471 316?2 67^51 .509 316.3 67.56 S 2581 rej. 8.0 ... 9.6 R.A. = 19" 43"- 8 s ) Decl. = - 11 42' ) 1901.49 316.2 67.53 The faint star was added with the 18|-in. No change. 1901.455 282?6 38 .'00 .473 282.7 38.35 .531 282.2 38.37 1878.40 300?2 1U64 In p 1875.66 316.5 67.66 3n J HN. 113 R.A. = 19" 40 > Decl. = +37 15' Decl. - - 32 $ 1900.458 293?0 2^14 1901.433 298.9 2.07 .436 299.7 2.14 .452 294.2 1.97 1902.02 116.3 17.24 Identified as above. The only measure is : 1885.71 117?6 17T34 In H.C.Wilson 1901.19 296.4 2.08 The change, if any, is a small increase in the angle. There is a 11.5m star, 2?2 : 26-'6. 55 56 MEASURES OF DOUBLE STARS 22612 R.A. = 19 h 55 m 31 s ) Decl. = + 6" 36' \ 1901.452 53?3 38-'97 .471 53.7 38.69 H 1470. D.M.(37)3744. 7.0 ... 9.1 R.A. = 1959 m 19 5 ) Decl. = +37 59' \ 1901.605 337?2 29^18 1902.449 337.2 28.94 .529 53.6 39.05 1902.02 337.2 29.06 1901.48 53.5 38.90 The distance is slowly increasing from proper motion, the angle remaining constant. S found 36 '59(1827 .67). These stars point to a 3" or 4" pair of 12.5m stars about 30" from B. Harvard Zones. 8.6 ... 13.0 . . . 11.5 R.A. =19 h 57 ra 6 s ) Decl. = + 22' f A and B 1900.458 145? 2 4f39 1901.433 146.1 4.05 This is H 605, the Decl. of which is uncertain in H. The companion is D.M.(37)2743. The colors, red and green, are well marked. There is probably a misprint in the distance by Secchi, 335?2 : 23 '83 (1856.63) In. 26 Cygni. 6 ... 8.3 ... 12.2 R.A. = 19 h 57 m 58 s ) Decl. = + 49 46' \ AandB 1898.463 147?4 41 .'98 .518 147.1 41.87 520 146 8 42 03 i onn QA I/IK Decl. = + 8 14' | 1900.706 260?2 25? 19 1901.395 261.7 25.52 No change since my measures in 1880, and the measures of S^agree with the last. Bossert gives the proper motion of A 0^161 in 248?2, and B 0^183 in 244? 1. The measures show no relative motion. p 363 RA. =20"24 m 28 s ) Decl. = +20 12' \ AandB 1900.438 64?1 18^70 1901.05 260.9 25.35 Only observed by H, 260?4 : 18" +- : 9 . . . 16 (1830) ; .703 65.2 18.74 .706 64.5 19.14 ' delicate and difficult." 1900.61 64.6 18.86 58 S. W. BCBXHAM 59 AandC 1900.438 198?4 44?22 .703 199.0 44.58 S2708 RA. =20 h 34 m 7 s ) Decl. = + 38 13' \ 1900.62 198.7 44.40 These measures indicate that the change in AB is due to the movement of the 11 5m star B and not A and C 1901.318 330?0 27^73 .320 329.9 27.59 the 7m star A. S N. 7. 10.0 . . . 10.5 . . . 103 HA. =20 h 2631 s : ) Decl. = - 26 9 : \ 1901.608 340?7 14-'84 AB .608 226.7 20.04 AC Given by $ Class I-II; "very close triple; vertex /." This is the only object I could find answering the description. The places are practically the same. There is a 13m star 1500 : 15 -'3 from A. 22696 1901.32 330.0 27.66 A and B 1901.320 20?3 15^39 The 13.5m star B was added by Hall with the 26-in. The principal star has a proper motion of 0?242 in 138?7, and it is well known that the change in C since 2 corresponds to this movement. The other companion was measured to see whether that showed the same displacement. From a comparison of my position with that of Hall in 1878 it appears that B is fixed in space like the other. ?1V. 78 = 22712 rej. 8 . . . 11.9 RA. =20" 34" 25 s ) Decl. = +62 1' \ 1901.608 124?3 28?92 .758 124.8 28.72 R.A. 20 h 27 m 34 s ) Decl. = + 5" 2' \ A and B 1901.742 305?7 0?84 .760 307.3 0.70 1901.68 124.5 28.82 The only observation is : 1783.22 49?4 19-'53 In H There is no star in this place. In the notation 1901.75 306.5 0.77 AB and C 1901.742 348?5 13-'73 .760 349.0 13.83 then in use this angle corresponds to 40-6n_f. If it is read sf, the angle would be 130?6. The principal star is D.M.(6r)2039. W 2 TTJf 1 1 R8 1901.75 348.7 13.78 The 14m star, C, was noted by me with the 18i-in. some twenty years ago. No other measures of it. No material change in AB. I, 2697 rej. 7.5 ... 9.5 RA. =20" 28" 13 s ) Decl. zz - 53' I 1901.720 1?8 30-'25 .760 1.8 30.59 RA. =20 h 35 1 ) Decl. = +37= 58' \ In Weisse, "duplex; comes ad boream." This star has no companion. The description applies to S 2708, which is near by. H 2988. D.M.(2)4227. 8.5 ... 9.6 RA. =20" 35" 52 s ) Decl. = + 2 32' \ 1901.512 138? 9 24^65 .529 138.3 24.65 1901.74 1.8 30.42 The only other measure is : 1848.67 1?7 32^10 In Mitchell 1901.52 138.6, 24.65 H says, " large star very red." It did not appear so on this occasion, nor when examined by me in 1876. 139?7:20' : (1830). 59 60 MEASURES OF DOUBLE STARS P 673 R.A. =20"36'"29 5 / Decl. = + 20 17' \ A and B B and C 1901.260 6?0 4?98 .318 9.3 4.83 .320 7.0 4.83 1900.438 297?8 3?51 1901.799 296.6 3.83 1901.30 7.4 4.88 At this time there were no measures of these stars 1901.11 297.2 3.67 AandC 1900.438 165?3 105^8 Single dist. 1901.799 165.0 105.62 published. T| Cephei. 3.5 ... 11 R.A. = 2042 m 51 s / "Ra^l - _L A1 99' f 1901.11 165.1 105.71 nV 4.1 1 78 1O Q 1900.684 38?8 85^18 .744 38.5 85.30 R.A. =20" 38- 17 s ) Decl. = +45' 24' \ 1901.531 314 2 17r03 .608 311.6 16.19 1900.71 38.6 85.24 The only previous measures are : 1879.35 33?8 100 '54 2n p The large star has a proper motion of 0'816 in 1901.57 312.9 16.61 Rectilinear motion. H 2994. 17 Capricorni. R.A. = 20" 39 12' ) Decl. = - 21 57' \ Herschel gives 338?7 : 20" : 6 . . . 18 (1830); "re- quires verification." I examined this star several times with the 18J-in. in 1877 under favorable condi- 6? 7, and the computed place of the companion from this movement and the measures of 1879 is 39? 1 : 85 '61. The small star is therefore not moving with the other. H 1381. 55 Cygni. 6 ... 10.8 R.A. = 2044 m 50 s ) Decl. = + 45 40' \ 1901.531 174?0 20^70 .608 173.8 20.74 tions without finding any companion; and on two nights was unsuccessful with the 40-in. It is safe to say the suspected companion has no existence. Skinner. 8.8 ... 8.8 R.A. =20"39 m 46 s ) Decl. = - 17 8' \ 1900.515 299?8 3f43 1901.471 297.9 3.66 .531 ,299.1 3.60 1901.57 173.9 20.72 Without change. 1875.11 174?0 20f49 2n A H 3004. 10.9 . . . 10.9 R.A. =20 h 46"'15 s ) Decl. = +62 5' \ 1901.531 197?7 3^74 .758 197.8 3.88 1901.17 298.9 3.56 From a list of doubles furnished me several years ago by Professor Skinner, of the Naval Observatory, noted by him in his meridian work. It has since been catalogued by Innes. OS 412 rej 7.3 ... 10.9 ... 109 1901.64 197.7 3.81 This is in the field p the 8m star, D.M.(61)2057. The only observations are 193?5 : !" : 13 = 13 (1830). O.Arg.N. 21247. 8.7 ... 8.8 R.A. =20"48 m 2 ! ) R.A. =20 Ml" 1 1 s I Decl. = +50' 14' \ A and B Decl. = + 53 36' \ 1901.531 184?3 9^64 .608 183.5 9.53 1901.260 280? 3 25?21 .318 281.5 25.32 .320 281.1 25.27 1901.57 183.9 9.58 "Duplex" in O.Arg. No other measures. The components are reddish : greenish. Other compan- 1901.30 281.0 25.27 ions more distant. 60 S. W. BfBNHAM 61 H5514 RA. =20" 49 31 s Decl. = - 5 31' Described by H, 200==b : 7' AB; 70 : 12* AC, all small stars. There is a faint triple of llm stars near this place, but the angles do not corre- spond. Glasenapp was unable to find it. OS 421 rej. 8.0 ... 93 RA. =20" SO- 47 s Decl. = +31 43' 1901.531 192?6 36 '73 Hussey measures a 12.5 star, 77?5 : 30*57 (1898.58). Howe. L 40496. 6.8 ... R.A. = 20 h 51 m 2 s ) i' r Decl. = 1901.529 .531 0= 71?7 72.0 11 26*30 26.25 26.27 1901.53 71.8 The other measures are : 1879.50 71?8 26*19 2n Cm 5 The principal star has a considerable proper mo- tion, but the authorities differ as to the amount; O.*109 in 204?2 (Bossert); 0*075 in 180 A.G. The stars seem to be moving together. D.M.(0=)4621. 8.8 ... 12.7 . RA. =20 h 51 m 21' ) Decl. = + 8' \ A and B 1901.529 335? 7 .531 334.1 9.0 11*44 11.36 1901.53 1901.529 .531 1901.53 334.9 A and C 138?6 138.7 138.6 11.40 41*25 41.38 41.31 In the Harvard Zones, "double, comp. /." The only measure is : " 1879.50 137?4 41-*76 2n Cin 5 1-1 H 3006. D.M.(2 ? )4285. 9.7 RA. =20 h 54 m 51 s Decl. = + 2 C 29' 1900.551 292?9 1901.455 289.8 .512 293.2 1901.17 292.0 .9.7 1*73 1.53 1.72 1.66 The prior observations are : 1830 300 = 0^5 1878.17 291.0 1.81 L 40682. 6 ... 8.8 RA. =20 h 54 m 58 s + 18 52 In 2n Decl. = f 1901.531 .720 .739 333?3 333.5 333.4 45*92 45.49 45.63 1901.66 333.4 45.68 Both stars in D.M. The only measure is : 1880.63 332?7 44*66 2n ft D.M.(0')4644 RA. =20 h 56 m 24 ! Decl. = + 10' Described in the Harvard Zones, sp : 3 ' : 9 ... 12. There is no companion of any kind, and nothing as described near this place. H 1606. D.M.(5302533. 8.8 ... 9.7 RA. =20" 57 Decl. = + 54 1901.531 186? 4 18*33 .608 185.6 18.51 .739 185.9 18.34 5*> A'J 1901.62 186.0 H gives 185?1 : 12 " (1828). nebula in the field. 18.39 There is a fine H 1608. 7.4 ... 10.7 RA. =20" 59" 9 s ( Decl. = + 11 58' \ 1901.509 257?9 19*41 .586 257.3 19.73 1901.54 257.6 19.57 The measures at Cin in 1879 show no change. Many stars in the field. H 274. 10.6 . . . 11.0 RA. =21 I m 20 s Decl. = +11 24' 1901.586 91U .589 91.9 9*46 9.52 1901.58 91.5 9.49 Not in D.M., but closely /D.M.(11 >4483. H found 93 :5' :9. . . 10(1820). 61 62 MEASUKES OF DOUBLE STARS H 3009. x Capricorni. 6 ... 11 ... 12.2 R.A. =21" I m 41 s t Decl. = - 21 41' \ A and B 1900.687 66?0 67^17 .742 66.2 66.82 Noted as double in the Harvard Zones. This is D.M.(0)4674. Only measured as follows : 1877.06 318?3 Of72 Bn A S 779. L 41086. 7.5 ... 8.5 R.A. =21" 4 m 26 5 ) 1900.71 66.1 67.00 BandC 1900.687 89?3 18^17 Decl. = +38 14' \ 1900.725 10? 3 112^77 1901.260 10.5 112.37 .742 89.5 18.33 1900.99 10.4 112.57 1900.71 89.4 18.25 The proper motion is small, '053 in 186?0. There is a 15m star 110?9 : 39'2 from A. H gives 68?5 : 70" ; 90 : 10" (1830). OS 527 R.A. =21" 2"> 1 s ) Decl. = + 4 40' \ 1900.551 272?3 0-'46 There are two or three faint stars between, and many in the field. The only other measures are : 1824.81 10?8 114^78 2n South S 2778. 8.5 ... 10.5 R.A. =21" 9 ra 28' / Decl. = 1 44' \ 1900.551 273?3 19^63 .553 273.0 19.90 .553 266.7 0.41 1900.55 273.1 19.76 1900.55 269.5 0.43 H 3011. D.M.(5)4707. 8.2 ... 14.5 RA. =21" 2 m 1 s ) Decl. = + 5 10' \ 1900.703 232?6 17^08 .706 232.8 17.39 S's distance in 1828 of 21 '19 seems to be too large. 1865.33 269?9 20^21 5n J 1880.72 271.2 19.91 2n ft H5516 R.A. =21 h 10 m ) Decl. = + 2 29' \ 1900.70 232.7 17.23 The principal- star has a proper motion of 0'170 in 206?0 (Porter). The only measure is : 255?4 : 20" (1830). There is a 6'3 pair of lira stars from A, 269 : 148". OS 428 rfj. 7.9 ... 9.7 R.A. = 21 h 3 ra 1 s ) Decl. = + 6" 10' \ 1901.531 256? 5 24^11 .586 256.1 24.21 Described by H, "quadruple; all in a line," the principal star 9m and the others 18m and 20m. This place was carefully swept over, but nothing found which seemed to answer the description. A.G.C. 13. r Cygni R.A. =21 h 10 m s ) Decl. = +37 32' \ 1897.689 324?6 0^94 1898.345 322.2 0.78 .482 322.1 0.86 1901.56 256.3 24.16 Without change. Harvard Zones. 8.9 ... 9.2 R.A. =21" 4 s J Decl. - + 49' i 1901.531 318?7 0.'94 .586 315.1 0.79 1898.17 323.0 0.86 P 163 R.A. =21"12 m 47 s { Decl. = +11 4' \ 1900.782 9U 82f41 1901.471 9.5 82.55 .512 9.3 82.35 1901.56 316.9 0.86 1901.25 9.3 82.44 62 S. W. BURNHAM 63 I have measured this 10.9m distant star for the purpose of having hereafter an independent value of the proper motion of AB. H 5265. 9.6 ... 10.1 RA. =21" 15- 10') Decl. = - 22 53' J 1901.589 191? 9 31^68 .758 193.7 31.56 No other measures since 1824. 1824.78 83?5 36 .'78 2n South The components are L 41562 and L 41563. The change in distance is supported by the meridian positions, which give, Lalande 37^25 (1800) and Lament 39 .'35 (1850). H 5517. 18 Aquarii 1901.67 192.8 31.62 The principal star is Cord.D.M.(22015347. This pair was put on the list to see if the apparent change in distance was real. 1879.65 19?1 22^85 In Cm 5 1890.57 191.1 32.19 2n Glasenapp Evidently without change. H 281. D.M.(16')4505. 8.7 ... 9.2 RA. =21 h 15">32 s ) Decl.= +16' 14' I 1901.589 333?9 13-97 .729 335.3 14.09 RA. =21 "17 -37' ) Decl. = - 13* 23' \ H has " a most minute point strongly suspected," and gives 270 : 13' (1823). I have looked for this many times in the last twenty years with various apertures, without finding anything of this kind. The 40-in. shows nothing nearer than the distant star measured in 1877. HA 165 RA. = 21" 19" 48 S : ) Decl. = -28 50' : \ The description in the Harvard Observations is 1901.66 334.6 14.03 No change since measures of Leavenworth in 1896 and Cin in 1879. H made the distance 17 '52 (1829.57). H 3023. p Equulei RA. =21'- 16 56 s ) Decl. = + 6 18' J A and B 1901.509 258?3 33-'86 .589 258.9 33.88 137": 10' : 8J . . . 11(1868.82). There certainly is no such pair in or anywhere near this place. I looked for it in 1876, and again with the 40-in. It may be identical with a Cin pair, having about the same R.A., but 8 north of the Hd place. The description agrees: 142?9 : 8^22 : 8 ... 10 (1879.54). H;5271. 10.6 . . . 11.6 RA. =21 h 20-44 s ) Decl. = 25 24 \ 1901.55 258.6 33.87 CandD 1901.760 43?6 6-'27 .799 48.0 6.68 1901.509 188U 6.'13 .589 187.6 5.48 1901.78 45.8 6.47 Herschel gives : 1901.55 187.8 5.80 A and C 1901.589 306?0 68M9 A and E 1901.589 2753 93M9 S 788. 7.2 ... 7.3 RA. =21"17' n 31 ) Decl. = - - 7 6' \ 1834.6 40?7 l.'5 In H H 1668. 8.4 ... 9.5 RA. =21 h 31 m 56 s ) Decl. = +23 8 ' \ 1901.414 34?8 8^16 .416 37.0 8.31 .473 36.2 8.23 1900.473 >y. 1 44 .'15 .476 88.0 44.43 1901.43 36.0 8.23 H gives 342 7'-t- 10 12 (1828) Xoted as 1900.47 88.0 44.29 double in A.G. 63 G4 MEASURES OF DOUBLE STARS H 941. 4 Pegasi. 6 ... 12.0 R.A. = 2132 m 31 s ) Decl. = + 5 14' \ 1901.471 337? 7 26?31 .509 336.2 26.29 H 285. 11.5 . . . 11.6 R.A. =21 h 39 m 4 s ) Decl. = +10 7' \ 1901.531 66? 2 7^44 .604 68.2 7.85 .512 338.3 26.10 1901.66 67.2 7.64 1901.50 337.4 26.23 H called the small star 17m. The large star has a proper motion of 0'103 in 84?5 (Boss.). The only measures are : 1878.71 344?9 25?95 In ft S 798 = $ VI. 103. e Pegasi R.A. = 21 h 38T7 s / Decl. = + 9' 20' \ H estimated distance 2" to 3". It is near D.M. (10)4617. ?N. 74 = H947. 7 . . . 10.7 . . . 11.7 R.A. = 21" 45- 57 s ) Decl. = + 19 16' \ A and B 1901.799 94?3 19 .'78 .818 94.1 20.15 A and B 1901.760 325?0 82^16 .818 324.8 82.00 1901.81 94.2 19.96 A and C IGTil 700 QO*> xl fMQO 1901.79 324.9 82.08 iyui./yy ojz.4 .&.oz .818 321.7 24.34 A and C 1901.760 320? 9 140^88 .818 321.8 141.34 .835 321.1 141.11 1901.81 322.0 24.33 Not measured by either Herschel. The only other measures are my own in 1879, which show no change. 1901.80 321.3 141.11 The proper motion of A is very small, 0'016 in 132?9. The following are all the measures : AB 1782.97 322?7 90^93 In Tj. 1879.54 325.2 81.36 2n ft AC 1825.18 323.0 138.51 2n South 1874.77 321.6 140.41 3n A Sh 336. 7.5 ... 8.1 R.A. =21" 52 36 s ) Decl. = + 5 27' J 1901.608 224? 8 10K05 .739 224.5 100.68 ji Cygni R.A. =21 h 38 m 46 s ) Decl. = +28 12' \ AandC 1900.647 271?5 4XK99 .684 271.2 41.06 1901.67 224.6 100.86 The other measures indicate some change in dis- tance. 1823.77 226?0 105^86 In Sh 1881.56 224.9 102.17 3n ft The components are D.M.(5)4915 and 4913. 1900.66 271.3 41.02 This 12.2m star was added by me with the 18|-in. The only measures are : 1878.91 263?2 35^34 3n ft With this place and the proper motion of A (0'353 in 135?4) the computed position of C at the above date is 272?4 : 41 ^32. It is therefore evident that C does not belong to the binary system. H. C. Wilson R.A. = 21 h 54 m : ) Decl. = + 1 20': ( The description in Cin 10 is 212?1 : 1?20 : 8 . . . 9 (1882.76) In. There is no such pair in or near this place. All the stars are much smaller than 8m. The description is not unlike S 2856, which is 5 1 "/ and 3n. 64 S. W. BURNHAM 65 Howe. L 42909. 8 ... 10.8 ... ri RA. =21"55 m 0' Decl. = - 16 A and B 271?6 270.9 1901.605 .739 1901.67 271.2 AandC(=H5524) 1901.605 292?4 .739 291.9 1901.67 292.1 9'12 9.14 9.13 102-'02 101.71 101.86 No other measures of AC. AB unchanged. H 289 = H 5525. 20 Pegasi. 6 ... 11.4 1901.799 .818 RA. = 21"55<"14> Decl. = + 12 33 324? 6 324.3 52^98 52.84 52.91 1901.81 324.4 The prior measures are : 1878.95 325?5 51 '06 3i ft The proper motion of A is 0'068 in 136?9, which corresponds to the change in distance shown by the measures. OS (App) 228. 8.1 ... 8.7 RA. =21 h 55">51 s Decl. = + 4 12' 1901.512 .604 27?2 27.4 75^67 75.60 1901.56 27.3 75.63 The smaller star not in D.M. The other is D.M. (4)4788. A has a proper motion of 0-'145 in 163?2, which explains the change. 1875.69 28?0 73-52 3n J There is a 12m star from A, 157 ?9 : 25T66 (1901.60) ir 1 Pegasi RA. = 22" 3- 54* Decl. = +32' 35' A and B. B = 13.5 1900.684 317?6 .687 316.9 1900.68 317.2 27T42 27.04 27.23 AandC. C = 1900.684 262?3 .687 262.3 1900.68 262.3 A and D. D = 11.5 1900.684 89?3 187 -'49 .687 89.3 187.51 7K67 71.74 71.70 Single dist. 1900.68 89.3 187.50 The only prior measures are mine in 1879. There is an error in the printed angle of AB; it should be 314?4. S 2866=H 1734 RA. = 22" 4"- 13 s t Decl. - -t-40' 4' \ 1901.722 533 .796 53.6 1901.76 53.4 No recent measures, but unchanged. 9'16 9.18 9.17 1-1 H 1735. L 43266. 7^ ... 8.7 ... 11.2 RA. =22" 4-"21 s DecL = +44= 15' A and B 1901.608 110?1 27'18 .758 110.1 27.07 1901.68 1901.608 .758 110.1 BandC 164? 7 164.0 27.12 22^78 22.70 1901.68 164.3 22.74 No other measures. The Decl. in H is 1 too large. A and B are D.M.(44')4059 and 4060. H 3094. 10.7 . . 10.7 RA. =22" Decl. = + ' 9 s 21' 1900.780 1901.531 1901.15 301?6 301.7 301.6 4- '80 5.15 4.97 H gives 315?5 : 3'= : 10 ... 10 (1830). A little p this, and about 2's is a similar pair, components equal, and same as the other pair; 114?6 : 3'72 (1901.15) 2n. H 957, 310' :2' : 11 ... 11+ (1820) should be 20 'n of H 3094, but I could find only the pairs measured, and the last named probably iden- tical with one of the others. 65 66 MEASURES OP DOUBLE STARS H 1741. B.A.C. 7746. 6.2 ... 9.7 R.A. =22" 6 ra 29 s > Decl. = + 60 14' $ 1900.684 308? 5 25?21 .687 309.8 26.49 S 2892 rej. 8.4 ... 11.1 ... 9.2 R.A. =22 h 12 m 55 s ) Decl. = - 11 24' \ A and B 1901.760 59? 1 Ilf86 1900.68 309.1 25.35 .799 56.0 11.53 The principal star has a proper motion of 0'151 in 62 5, which accounts for the change. 1828 328? 5 20 " In H 1876.29 316.8 23.22 In J 1901.78 57.5 11.69 AandC 1901.760 263? 1 35^96 .799 262.6 35.98 1900.68 309.6 25.04 2n Espin S 2875 rej. S.D.(8)5835. 8.8 ... 11.6 R.A. = 22 h 7 23 s ) Decl. = - 8" 24' \ 1901.605 44? 1 15^00 .758 45.6 14.62 1901.78 262.8 35.97 In Mens. Microm., p. xxxiv, 2 gives : 1831.32 50?0 9'0 1831.32 266.0 35.0 Howe R.A. =22 h 14 ra : ) 1901.68 44.8 14.81 No other measures. 91.49 R.A. = 22" 8 m 3 s ) Decl. = + 60 10' \ Given by H as Class I with angle 4?2 (1783.06). The place is that of a 6.7m star. I looked for this carefully in 1876, and now with the 40-in., and there is certainly nothing there. There must be a large error in place. H 293 = S 2888 rej. 8.7 ... 11.0 Decl. = + 5 3': \ The measure by Howe in Gin 5 is 121?6 : 1'03 : 8.5 ... 9.0 (1879.64) In. This pair should be 8' south of the triple 30 Pegasi. There is no such pair either in or anywhere near the given place. All the neigh- boring stars were examined. It is undoubtedly identical with /3 842, which is about 10 ra p and 3 ' n of the place given above. The description corresponds exactly. D.M.(10")4731. 8 ... 11 R.A. =22"14 m 25 s ) Decl. = +10 26' \ 1901.589 305? 1 39^78 .609 305.4 40.12 R.A. = 22ll m 2 s ) Decl. = + 12 22' \ 1900.742 276 8 18^41 1901.509 276.8 18.80 .512 275.4 18.44 1901.60 305.2 39.95 H observed this star for 2 2998, which is 2 m /; 310?7 : 35" (1830). He called the components orange : blue. A appears yellowish, but no notice- able color in B. 1901.25 276.3 18.55 This is D.M.(12)4794. The only prior measures are by H, 276?4 : 10" : 9 . . . 13 (1820). H 3104. S.D.(17)6488. 9.3 ... 9.5 H 3106. -y Aquarii R.A. =22 h 15 m 27 s ) Decl. = 1 59' $ 1901.586 131?2 4U98 .605 132.8 42.35 R.A. = 22"12 m 35 s > Decl. = - 17 42' \ 1901.760 76? 1 10^39 .799 74.8 10.15 1901.59 132.0 42.16 The only measures of this 12.2m star are : 1838.76 125?9 49^46 In Lament 1878 72 129 6 43 87 In ft 1901.78 75.5 10.27 OnlyH, 83?9:8" (1830). The principal star has a proper motion of 0'103 in 80?5. 66 S. W. BURXHAM 67 OS (App) 231. L 43659. 8.2 ... 8.4 RA. = 22" 16" 37 s ) Decl. = + 9 20' i 1901.608 110?2 90-'79 .739 110.3 90.92 1901.67 110.2 The only measures are : 1875.74 109?8 91-02 H 1756. 6.7 ... 10.6 ... RA. = 22" 16- 42 s ) Decl. = + 40 4' \ A and B 1901.722 286?6 21 '85 .739 286.4 22.31 1901.73 286.5 A and C (new) 1901.722 325?8 .739 325.8 22.08 22^47 22.39 1901.73 325.8 22.43 H gives for AB 283?5 : 15' : 9 . . . 12 (1828). The magnitude of A in D.M. is 6.5. H 3108 = OS (App) 232. 8.4 ... 8.4 RA. =22" 17" 34* > Decl. = + 3* 14' \ 1901.799 190? 9 67T67 .818 19D.9 67.49 1901.81 190.9 The other measures are : 1875.98 190?4 65T72 67.58 4n W : XXII. 382. 8.8... 9.0 RA. = 22 h 18"'31 s ) Decl. = +40" 18' \ 1901.473 52?3 6'59 .722 55.0 6.49 .739 53.6 6.69 1901.64 53.6 6.59 In Weisse "duplex 6"." No other measures. H 3116. D.M.(6=)5023. 9.5 ... 12.5 RA. = 22" 21 -> 15 s ) Decl. = + 6' 56' \ 1901.720 257?7 25^52 1902.471 257.8 25.95 1902.09 257.7 25.73 No measures in H ; "estimated from diagram." Harvard Zones. 9.5 ... 9.6 1901.720 .760 1901.74 RA. =22" 22" 53 s Decl. = + 40 181?5 182.5 -I 182.0 3. '04 3.22 3.13 Noted in Hd Zones, nf : 3' . No other measures. It is D.M.(0=)4879. 1901.318 .320 .375 .473 1901.37 Krueger 60 RA. =22 h 23-43 s Decl. = + 57' 3 A and B 133? 3 130.5 131.4 130.4 \ 1901.318 .320 .375 .473 1901.37 131.4 A and C 58? 8 58.5 58.4 58.8 58.6 A and D 98?7 98.4 98.5 1901.318 .328 .375 1901.34 98.5 A and D.M.(56)2784 1901.318 144?62 .320 144.72 .375 144.63 .474 144.52 3-'25 3.37 3.38 3.42 3.35 36 '59 36.26 36.69 36.66 36.55 66-73 66.95 67.57 1901.37 144.62 67.08 199 -'31 199.50 199.15 199.65 199.40 It was apparent soon after the first remeasure- ment of A by Doolittle that these stars belonged to the type of 61 Cygni, where the change in the relation of the components is due to their different proper motions. These are small stars, and their movement in space had not been noticed by meridian observers and those interested in stellar motions. To determine whether or not the third star, meas- ured by me in 1890, has any proper motion of its own, I have connected A with the nearest bright star, D.M.(56)2784. The positions of A and this star are in the A. G. catalogue, and these give for the relation of the two 151?9 : 195'35 (1873.2). Comparing this with my direct measures, assuming that the distant star is fixed, we have for the proper motion of A 67 68 MEASURES OF DOUBLE STARS 0?903 in 247?2. The present measures of AC and those of 1890 make this value 0?927 in 244?9. The close agreement of these results makes it practically certain that the change is solely due to the move- ment of A. Taking the mean, 0?915 in 246?0, as the best value for this motion, and my measures of AB S 2933 rej. D.M.(10)4804. 9.2 ... 10.4 R.A. =22 h 36 m 49 s ) Decl. = + 10 22' J 1901.586 218? 4 4? 10 .589 215.3 4.42 in 1890 and 1901, we have for the proper motion of B 0?702 in the direction of 239?0. H5528 R.A. = 22" 31 - 22 s ) Decl. = + 8' 11' \ H gives 90 : If : 11 ... 12 (1823); "elongated ; not fairly divided." The place is exactly that of the 9.1m star, D.M.(8)4902 = W ' XXII. 631. I looked at this star with the 6-in. in 1876, and with the 18- 1901.58 216.8 4.26 No other measures. H 3139. 13 ... 13 R.A. =22 h 38 m 37 s ) Decl. = -|- 4 43' \ 1900.725 208?5 2?17 .742 221.7 2.80 in. in 1877 without seeing any indication of duplicity. I could find no pair in or near this place with the 40-in. H 5529. K Aquarii R.A. =22" 31 '"32 s ) Decl. = - 4 51' \ H describes this 290 :4f (1827); "an ex- ceedingly minute point strongly suspected." I have looked in vain for this many times in past years. The 40-iu. under fine conditions failed to show any companion. The principal star has a proper motion of 0?142 in 219?2. Pegasi. . . . 12.0 R.A. = 22 h 35">38 s ) Decl. = + 10 12' \ 1900.515 139? 1 63?45 1900.73 215.1 2.48 Described by H, 142" : 2 : 11 = 11 (1830). The pair measured is in the correct place substantially, but description does not agree. In the field is a triangle of llm stars, the side of which is about 23". The / star of this triangle is 98?3 : 33 'I from A of the double. H 301. | Pegasi. 5 ... 12.2 R.A. = 2240 m 42 s ) Decl. = + 11 33' \ 1897.714 110?5 12?22 1898.492 108.0 12.61 .502 110.3 12.08 1900.515 110.6 12.36 .551 109.1 12.22 .553 109.3 12.43 . 551 138 .9 63 . 72 1899.39 109.6 12.32 1900.53 139.0 63.58 The only measures are : 1879.54. 137?8 64?33 In ft The proper motion is 0?067 in 105?5, and this ap- pears to account for the change in distance. 9 N. 140. L 44382. 6.5 ... 9.1 R.A. =22" 35 51 s ) Decl. = - 5 44' \ 1901.589 262?2 75?21 .703 262.4 75.33 H called the small star 18m, and gave the angle 122?8 (1820). There are no other early measures. The large star has a considerable proper motion, 0-'541 in 158?9, and the companion is moving with it. 1866.79 117? 7 12? 17 2n A 1879.38 112.6 11.93 4n ft OS 480 = H 1809 R.A. =22" 41 -"19 s ) Decl. = +57 27' \ 1901.64 262.3 75.27 No measures in Jf, but called Class II. The place is given by H as above. There is nothing of Class II in or near this place. 1900.742 117?3 30?76 Without change. In 1873 I thought the principal star was elongated, but it was round with all powers at the time of the above measure. S. W. BUBNHAM 9 VI. 97. x 2 Aquarii. ... 9.5 1900.647 .666 R.A. = 22 h 43 ra 14 s Decl. = - 14" 13' 294?4 293.9 133^33 132.95 1900.65 294.1 133.14 No measures in the last seventy-five years. 1783.60 288?5 123.'61 In $ 1825.30 292.4 133.44 2n S The proper motion is very small, 0'059 in 2275. H 1825. D.M.(12')4904. 9.0 ... 93 R.A. = 22" 47- 50 s ; Decl. = + 12' 58' { 1900.553 223?2 I'.ll .666 222.2 1.77 1900.61 1.77 (1828); " 222.7 H gave 230' : l' : 10 ... 11 (1S2S); "very delicate; could not verify it, having mislaid the high power." No other measures. In 1876 I looked up and estimated distance 1 '2. H3152. L 44810 .A. = 22" 48- 40' > ecl. = -10' I 1 J Given by H 135?4 : 3" : 9 . . . 15 (1830). " Large star very red. A very difficult object. Measured with 320, which still left a suspicion of illusion, though I have hardly a doubt." I have looked for this several times previously with apertures up to 18^-in., but have never seen any trace of a companion. It was examined on two nights with the 40-in. H 974. D.M.(4)4921. 8.7 R.A. = 22" 49-" 20 s Decl. = + 4- 11' 1901.529 88?6 .531 88.3 1901.53 88.4 . 9.7 44 .'33 44.27 44.30 H has 91?5 : 40" : 9 . . . 12. A has a proper mo- tion of O'll in 213?7 (Boss.). S 2972 rej. D.M.(- O')4451. 9.3 ... 11.7 s ) ' J R.A. = 22 h 56'"34 s Decl. = - 23' 1901.589 .605 1901.60 147?4 148.5 147.9 15 '42 15.56 15.49 Only H, who has 198?0 : 12' : 9-10 ... 14 (1830). The angles do not agree. Two other similar pairs were measured in the immediate vicinity. The first is D.M.(-0)4445, 159?1 : 24-'40 : 8.5 ... 12.7 (1901.60) In; and the other D.M.(-0 )4453, 172?7 : 19'14 : 10.8 . . . 10.9 (1901.60) In. The latter star is 9.5m in D.M. H 3164. L 45137. 6.9 ... 12 R.A. =22 h 58">52' Decl. =22 h 58">52' / . = - 17 44' \ 1901.586 .758 129? 5 130.0 1901.67 129.7 Only H, 136?5 : 30' (1830). Christiania A.O. 3744. 8.8 R.A. =23" 6-11' Decl. = + 65 15 1901.318 265?4 .474 265.0 I 55^05 55.11 55.08 . 9.0 14f83 14.91 1901.40 265.2 14.87 No change since my measures in 1891. 1900.782 1901.320 1901.05 H 1855. 10 ... 10 R.A. = 23" 6 m 18' Decl. = +.44 56 111?2 113.0 ' ) ' J 112.1 4-44 4.64 4.54 H gives 296?7 : !' : 11 = 11 (1828). Not in D.M., but the place is correct. 22993 R.A. =23" 7 Decl. - - 9' 47' 35' 1900.515 .744 A and B 176^6 176.9 25^41 25.38 1900.63 176.7 25.39 No relative change, but they have a common proper motion of 0'519 in 93?4. There is a distant star not moving with the others. 1900.515 114? 5 126 r08 .666 114.5 126.17 .744 114.5 125.85 1900.61 1824.82 109?2 114.5 158-17 126.07 2n South 69 70 MEASUEES OF DOUBLE STARS P182 R.A. =23" 10 52 s ) Decl. = - 14 28' \ A and B 1900.742 41?4 0^60 H 3185. Neb 13.4 R.A. = 23 h 15">36 s ) Decl. = + 8 U' \ 1901.720 164? 21? 12 .760 163.3 21.37 1901.586 43.3 0.56 1901.74 163.6 21.24 1901.16 42.3 0.58 AB and C 1900.666 77?5 69-'49 .742 77.7 69.56 .744 77.2 69.61 Described by H, 160 : 14 ... 14 (1830); "a double with some nebulous appendage." A of the above measures is a faint nebula (Dreyer 7634). No star was seen in the nebula. HI ft QQ 77 1O 117 1900.72 77.5 69.55 1901.586 77?0 70^03 .608 77.4 70.20 looy. 1.1 . . . iz . . . ii.i R.A. = 23 h 26 m 4 s ) Decl. = +37 39' \ A and B 1901.59 77.2 70.11 1900.706 2414 44'05 .744 241.1 43.80 I measured the distant star first in 1898 in order to get an independent value for the large proper motion given the close pair from meridian observa- tions (U302 in 201?2). 1898.66 79?9 68^04 2n /3 1900.72 241.2 43.92 AandC 1900.706 57?8 55^79 .744 57.1 55.84 The measures indicate that this unusually large proper motion for a faint star is substantially correct. H 3183. 9.1 ... 12.1 ... 12. 1 1900.72 57.4 55.81 H gives AB 238?2 : 20" ; AC, 58?2 : 25" (1828). There is a 13.5m star from A 211?8 : 29^6. R.A. = 23 h ll m 43 s ) Decl. = - 2" 23' i A and B 1901.605 95?3 95^76 Winnecke. o.o . . . y.z R.A. =23 h 26 ra 35 s ) Decl. = +30 47' \ 1901.796 164?9 1^59 .815 166.0 1.37 .720 95.9 95.60 1901.80 165.4 1.48 1901.66 95.6 95.68 BandC 1901.605 11?2 4^37 .720 16.3 4.34 The only measures are : 1863.85 168?5 If51 2n Wn There is a 13.5m star 133?2 : 23^4, and a 3' pair of 10.5m stars in the field sp. The principal star has 1901.66 13.7 4.35 A is S.D.(2)5921. H gives for BC 12?3 : 2' + (1830). 9 VI. 61 R.A. = 23 h 14 ra 14 s ) Decl. = + 4 44' \ Herschel's place is that of 7 Piscium. His de- a proper motion of 0'148 in 61 ?4 (Kustner). Evi- dently the components are moving together. 5 N. 35 = H 316. 6.9 ... 10.8 R.A. =23" 31 ""27 s ) Decl. = - 13 44' \ 1901.608 92?9 33^21 .758 92.7 33.09 .796 92.3 33.37 scription is, " they form a triangle, each side of which is about 1 '," and speaks of it as near the bright star. I could not find anything here which could be satis- factorily identified. 1901.72 92.6 33.22 The only prior measures : 1877.83 92?7 33^22 In ft 70 S. W. BUBNHAM 71 H 1898. K Andromedae. 4 ... 11.1 . . . 11.1 XV..A. i& O"i *%J f Decl. = + 43 40' \ A and B 1901.625 191?9 46'82 Egbert. D.M.(16 )4980. 8.7 ... 8.8 R.A. =23 h 40 m 26 s / Decl. = + 16 25 1901.608 88?2 U32 .703 85.5 1.22 .815 191.6 46.69 1901.65 86.8 1.27 1901.72 191.7 46.75 A and C 1901.625 294? 5 105 '08 .815 294.8 104.83 Given with approximate place in Gin : 1879.66 89?0 1'37 2n Gin Also noted as double in A.G. 1901.72 294.6 104.95 The proper motion of A is 0'078 in 107?8, which J 28. D.M.(62)2296. 8.6 ... 10.8 . . . 101 explains the change in the distance of C. 1879.24 188? 7 46?64 3n ft 1879.24 294.6 103.17 In W XXIII. 696 R.A. =23 h 41 ra 32 5 > Decl. = + 62 33' \ A and B 1900.742 357?9 1'73 1901.722 359.2 1.56 R.A. =23"35 m 7 s ) Decl. = - 5 5' ) " Duplex " in Weisse, but this is an error, as this star is not a double of any class. The wide pair 1901.23 358.5 1.64 A and C 1900.742 144? 7 10 '43 1901.722 144.8 10.54 measured for this in Gin* is l m 28*p and 5-5n. No change in that. 1901.796 67?5 42'02 9.0... 9. 5 In S 3032 rej. L 46416. 8.3 ... 10.0 R.A. =23 h 35 m 16 s ) Decl. = + 14 T \ 1901.720 338?9 19*23 .758 339.0 19.23 1901.23 144.7 10.48 Discovered by Dembowski in 1876. Only his measures : 1877.29 358?6 1'61 3n J 1877.29 143.6 10.33 3n J S 835. 20 Piscium. 6 ... 8.6 R.A. =23'-41 m 46*) 1901.74 338.9 19.23 The only observations by H, 339?5 : 15' (1828). 1900.553 285?0 172 -'65 .666 285.3 172.81 Harvard Zones. 9.7 ... 13.0 R.A. = 23 h 35 m 50 s ) Decl. = + 41' \ 1901.605 146? 75 -'64 .608 146.3 75.64 1900.61 285.1 172.73 The only prior measures are : 1824.83 287?2 170-'92 2n South W 2 XXIII 896 1901.60 146.1 75.64 In Hd Zones s/: 30' : 9 . . . 14. A is D.M.(0) 5035. R.A. =23 h 4315 5 ) Decl. = +24 41' \ " Duplex " in Weisse, but certainly not double. 71 72 MEASURES OF DOUBLE STARS W XXIII. 865 R.A. = 23 h 43 m 40 s ) Decl. = +16 12' \ " Duplex " in Weisse. Examined twice, and not a double of any kind. H 319. D.M.(10)5003. 9.5 ... 11.7 R.A. = 23 h 45 m 42 s ) Decl. = +10 37' $ 1901.605 285? 1 15^49 .608 284.3 15.29 Camb. A.G. 14394 R.A. = 23 ''54 -16 s ) Decl. = +26 15' \ Noted in Camb. A.G. as a "close double." I have looked at this 6.5m star three times in 1901. On the last occasion 85 Pegasi, which is close by, was easily measured. At no time was there any indication of this star being a double of any kind. Duner. D.M.(6)5233. 9.0 ... 9.5 1901.60 284.7 15.39 No other measures. W XXIII. 1008. 9.0... 9.1 R.A. = 2355 ra ll s ) Decl. = +7 2' \ 1900.666 264? 8 15^04 .668 263.8 15.11 R.A. =23 h 50 m 40 s ) Decl. = 1 11' \ 1900.780 253?4 1U86 .782 254.0 11.76 1900.66 264.3 15.07 The only measures are : 1869.31 265?3 15 .'26 3n Duuer 1900.78 253.7 11.81 " Duplex " in Weisse. No other measures. H 321. 7.5 ... 11.2 R.A. = 23 h 5138 s ) Decl. = +10 48' \ 1901.703 132?9 20^30 .720 132.3 20.64 P 733. 85 Pegasi R.A. = 2355 m 54 s > Decl. = +26 27 ' \ A and B 1900.854 253?0 0-'97 A and P 1901.71 132.6 20.47 No other measures. 1900.854 342?6 36-'65 .873 342.1 36.55 D.M.(10")5017. 8 ... 12.5 Decl. = + 10 35' \ 1901.608 122? 7 25^76 .760 120.7 25.56 1900.86 342.3 36.60 W 1 XXIII. 1147 R.A. =23 h 56 m 49 s ) 1901.68 121.7 25.66 Measured the first time by mistake for the pre- ceding pair, H 321. No other observations. Decl. = + 2 43' \ " Duplex " in Weisse. There is no companion star near enough to be mentioned. II. NEW DOUBLE STARS P 1291. D.M.(37)94. 8.4 . . .12.8 p 1292. D.M.(3 )161. 8.5 . . .9.0 R.A. = O h 28 m 56 s / Decl. = +37 2' ( R.A. = 1" 135 S f Decl. = + 3' 46' ( 1900.725 168? 7 .742 169.0 .780 169.6 2. '94 '2.75 2.85 1900.780 24? 5 1901.586 21.8 .796 26.4 0^31 0.36 0.23 1900.75 169.1 2.78 1901.39 24.2 0.30 72 S. W. BfBXHAM 73 p 1293. L 5287. 7.1 ... 10.7 R.A. = 2 h 45">56 s ) Decl. = + 46= 40' \ 1900.687 352?6 K73 .780 350.9 1.68 .782 352.9 1.75 slow retrograde motion about the close pair, as will be seen from the following measures : 1829.79 311?4 1'58 in 2 1846.44 304.6 1.61 3n 02 1870.02 299.0 1.63 3>i J 1888.92 291.9 1.58 3 ft 1901.05 288 7 1 54 3n ft 1900.75 352.1 1.72 Found in measuring 2 324 re/., which is 2 m 31 s / and 0-'9s. P 1294. D.M.(46)734. 8.8 ... 8.9 R.A. =3 h 12">24'/ Decl. = +46 15' > 1901.589 228? 9 6-'33 .742 226.8 6.26 .758 227.7 6.14 The small star D was added by me with the 36-in. The only other measures are : 1888.92 209?8 23'66 3n ft With this position and the proper motion of AB the place of C at the date of my last measures should be 212?3 : 23'16 (1901.05). As this is practically identical with the measures, it is certain that the small star does not belong to the triple system. 1901.69 227.8 6.24 The components are red and green. The D.M. magnitude of A is 9.2. P 1295. 2 CamelopardaJi. 5 ... 7 R.A. = 4 h 30">27 5 / Decl. = +53" 14' } A and B 1901.758 139?2 0-'15 .796 138.5 0.25 .818 140.7 0.21 .854 143.3 0.24 p 1296. L 12112. 8.0 ... 8.5 R.A. =6 h 14 m 6 s / Decl. = - 7 12 \ 1900.780 201 ?0 0^21 A close and difficult pair found in measuring H 2315, which is 58 s / and 3 '2s. P 1297. S.D.(22 ; )4158. 8.7 ... 9.5 R.A. = 16" 15 m 10 s ( Decl. = -22' 21' \ 1901.359 140?6 K91 .395 137.0 1.92 1901 80 140.4 0.21 .433 137.7 1.90 AB and C (=2566) 1900.780 290?0 1T61 .782 286.5 1.60 1901.589 289.5 1.42 1901.39 138.4 1.91 Found in looking for H 4851. 1901.05 288.7 1.54 AB and D 1900.780 212? 4 23' 13 .782 212.5 23.35 1901.589 213.6 23.30 P 1298. 7.6 ... 8.9 R.A. = 16 h 53 m 49 s ) Decl. = + 9' 52' \ A and B 1901.531 91?7 0'26 1901.05 212.8 23.26 .586 .589 84.8 0.33 The principal star of the 2 pair is a close and somewhat unequal double, and is certainly a binary system, and probably in rapid motion. The 2 com- panion was measured by me in 1888 with the 36-in., and the close pair would have been detected with the present distance. The large star has a proper mo- tion of O'lOO in 1532 (Porter), which is also the 1901.57 88.2 0.29 AB and C (= 02 App 150) 1901.359 165U 76 '44 .375 164.9 76.62 .586 164.8 76.57 movement of the old companion. That star is 1 in 1901.44 165.0 76.54 73 74 MEASURES OF DOUBLE STARS C and D ( = 2 2111 rej.). 8.5 ... 12 BandC 1901.359 164?0 23^91 1900.551 336? 6 0^66 .375 164.5 24.19 .553 337.1 742 341 1 68 1901.37 164.2 24.05 . 1 i ) 1 1 . 1 .780 334.1 0.62 The principal star of this wide pair is a close and difficult double. The only other measure of C is : 1900.66 337.2 0.65 1874.84 165?2 77^02 Bn A This is 27'/ and 3'ra of 468. Probably no sensible proper motion, as the me- ridian positions by Lamont give 164?5 : 76 '74 (1844.5). P 1302. D.M.(22)4170. 8.2 ... 12.3 ... 8.4 The close pair has been measured at Mt. Hamilton : R.A. = 20 h 39 m 32 5 / 1901.69 92?3 0^26 3n Aitken Decl. = + 22 45' \ A and B No other measures of CD. 1901.414 140? 2 2^15 .416 134.7 2.03 B 1299. D.M.(10)3337. 8.5 ... 8.5 ... 11.5 .433 142.3 2.21 r ^ ' R.A. = 17 h 51 m 50 s ) 1901.42 139.1 2.13 Decl. = + 10 58' ( AandC A and B 1901.414 209?0 52 ?31 1900.476 155?6 0^48 .416 208.5 52.21 .515 151.6 0.55 .433 209.2 52.06 1900.49 .153.6 0.51 1901.42 208.9 52.19 AB and C C is D.M.(22)4169. The A.G. positions give 1900.476 63? 5 26 ^69 208?0:5ir87. .512 62.7 27.44 .515 62.7 27.13 P 1303. L 41147. 7 ... 13.2 1900.50 63.0 27.09 R.A. =21" 6-"56 s ) Decl. = + 2" 19' | The close pair was suspected with the 6-in. in 1872, and subsequently overlooked until the present time. 1900.551 235? .553 237.5 3^91 4.00 .725 236.9 4.14 p 1300. 30 SagMarii. 6 ... 13 1900.61 236.5 4.02 R.A. = 1843">38 S ) Decl. = - 22 15' \ P 1304. L 41433. 8.1 . . . 12.7 1900.473 247?6 2U28 R.A. = 21 h 14 m 7* ) .512 245.6 21.40 Decl. = - 2 1' \ 1902.567 246.5 21.71 1900.473 57?1 3^29 1901.18 246.6 21.46 .476 57.8 3.23 .515 60.9 2.82 The large star has a small proper motion, 0'075 in 260?0. 1900.49 58.6 3.11 Found in looking for 2 2778. P 1301. L 37588. 8.5 ... 9.5 ... 9.5 R.A. = 19 h 40 m 25 s ) p 1305. D.M.(12)4622. 8.8 ... 9.9 ... 10.5 Decl. = + 4 0' \ R.A. =21*39"' 9 s ) A and BC Decl. = + 10 14 ' ) 1900.551 66? 3 56^76 BandC .553 66.7 56.89 1901.531 50? 8 0^97 .647 67.0 56.74 .760 45.7 0.98 1900.58 66.7 56.80 1901.64 48.2 0.97 74 S. W. BURXHAM 75 A and BC C and D (new). 12.9 . . . 13.9 1901.531 90?9 88?46 1900.742 95? 7 2. '12 .605 91.5 88.87 .780 101.4 1.75 1901.57 91.2 88.66 1901.758 102.4 .854 106.2 1.69 1.85 1901.28 101.4 1.83 P 1306. D.M.(22)4484 In measuring the faint star C as a check hereafter RA. = 21 h 43 m 58 s ) on the proper motion of AB as given from meridian Decl. = +23 I' J positions, it was found to be a rather difficult pair. A and B. 8 ... 12.3 C has not been measured before. Porter gives the movement ' 1901.414 295? 7 31^25 A or- in qn?n ling star it is evi- f A is cor- 90% since CORRECTIONS 'Comparing 3 of Dem- i of A we Page 5. O.Arg.N.21. For 2^592 read 22 .'59. movement 13. S 353 rej. In the angle by H for 56?4 read 65?4. nents will 18. D.M.(21)694. In the note for 10" n read 10' n. e between that of 61 28. S 550. For L 15459 and 15460 read 14559 and 14560. lirs where 35. Howe. The pair measured is new. The Howe pair was afterwards found and the same identified as D.M.(24 C ) 2709. 37. S 2031 rej. For D.M.(-1)3761 read D.M.(-1)3161. 57. Aquilae. In the proper motion for 203?6 read 336?7. . .135 60. OS 412 ri'j. In the R.A. for 41 m read 42 '. 74. p 1305. For D.H. (12")4622 read D.M.(10)4622. 20 78 32 10 A and B( = H 1770) 1900.744 274? 7 9.'06 1900.73 309.4 6.93 B andC .782 273.7 9.44 1900.742 339?5 46-'49 1901.720 273.8 9.52 .780 338.6 46.62 1901.758 339.1 46.86 1901.08 274.1 9.34 The close pair is a difficult object. H gives for 1901.09 339.1 46.66 AB277?5:5' (1828). 75 74 MEASUEES OF DOUBLE STARS C and D (= S 2111 rej.). 8.5 ... 12 1901.359 164?0 23^91 .375 164.5 24.19 1901.3? 164.2 24.05 The principal star of this wide pair is a close and difficult double. The only other measure of C is : 1874.84 165?2 77^02 3n A Probably no sensible proper motion, as the me- ridian positions by Lament give 164?5 : 76 '74 (1844.5). The close pair has been measured at Mt. Hamilton : 1901.69 99?3 O.'2fi 3tt_ No other n 1900.551 .553 .742 .780 BandC 336? 6 337.1 341.1 334.1 1900.66 337.2 This is 27"/ and 3'n of /3 468. 0^66 0.68 0.62 0.65 P 1302. D.M.(22)4170. 8.2 ... 12.3 ... 8.4 R.A. = 20 h 39 m 32 s Decl. = + 22 45' 1299. 1900.' .1 1900. < 1900.- 1900.1 The close 1872, and sut time. Decl. =: - 22 15' \ P 1304. L, 41433. 8.1 . . . 1Z.V 1900.473 247? 6 21?28 R.A. = 21"14 m 7 s ) .512 245.6 21.40 Decl. = - 2 1' J 1902.567 246.5 21.71 1900.473 57? 1 3^29 1901.18 246.6 21.46 .476 57.8 3.23 .515 60.9 2.82 The large star has a small proper motion, 0'075 in 260?0. 1900.49 58.6 3.11 Found in looking for 2 2778. P 1301. L 37588. 8.5 ... 9.5 . . . 9.5 R.A. = 19 h 40 m 25 s ) p 1305. D.M.(12)4622. 8.8 ... 9.9 ... 10.5 Decl. = + 4 0' \ R.A. = 21 h 39 m 9 s ) A and BC Decl. = +10 14' J 1900.551 66? 3 56 .'76 B and C .553 66.7 56.89 1901.531 50? 8 0^97 .647 67.0 56.74 .760 45.7 0.98 1900.58 66.7 56.80 1901.64 48.2 0.97 74 S. W. BUBXHAM 75 A and BC 1901.531 90?9 88^46 .605 91.5 88.87 C and D (new). 12.9 . . . 13.9 1900.742 95?7 2^12 .780 101.4 1.75 1901.57 91.2 88.66 1901.758 102.4 1.69 .854 106.2 1.85 P 1306. D.M.(22)4484 T> 4 __ 01 h AQ m *yj s ) WA. Zl 4O OO / Decl. = +23 I' J A and B. 8 ... 123 1901.414 295? 7 31^25 .416 294.4 31.64 .433 294.9 31.05 1901.28 101.4 1.83 In measuring the faint star C as a check hereafter on the proper motion of AB as given from meridian positions, it was found to be a rather difficult pair. C has not been measured before. Porter gives the movement : A 0^203 in 90?0 B 0.212 in 84.3 He says that the value for the preceding star 1901.42 295.0 31.31 C and D. 12.2 ... 12.6 1901.414 346? 9 I'Ol .433 337.5 0.96 - .799 344.8 1.68 (Bradley 2953) is somewhat uncertain, and it is evi- dent that if the direction of the motion of A is cor- rect, the direction of B must be more than 90% since the stars are approaching each other. Comparing the measures of AB given above with those of Dem- bowski in 1866, with Porter's proper motion of A, we 1901.55 343.1 1.22 A and CD 1901.414 275?9 33^03 .416 275.6 32.88 .433 276.2 32.84 of B. The nearest approach of the components will occur in about 145 years, when the distance between them will be only 2". This system is like that of 61 Cygni, and a large number of similar pairs where the respective components have nearly the same movement in space. 1901.42 275.9 32.92 P 1307. 53 Aquarii R.A. =22"20 m 3'[ Decl. = - 17 21 \ A and B (= $ N. 41 = Sh 345) 1900.687 309?3 6'99 P 1308. D.M.(12")4837. 9.4 ... 12.2 . . . 133 RJL = 22 h 26 m 18* ) Decl. = + 12 34' \ BandC 1900.782 56?5 U20 .796 62.2 0.78 .854 71.9 1.32 . <4z oU9.7 b.oi .780 309.2 6.92 1901.81 63.5 1.10 1900.73 309.4 6.93 B andC 1900.742 339? 5 46 .'49 A and B ( H 1776) 1900.744 274?7 9^06 .782 273.7 9.44 1901.720 273.8 9.52 . < 80 008 .0 4b . bz 1901.758 339.1 46.86 1901.08 274.1 9.34 The close pair is a difficult object H gives for 1901.09 339.1 46.66 AB277?5:5' (1828). 75 YE 02287