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DEPARTMENT OF THE INTERIOR 
 
 Hon. W. J. RoCHI, MmuHr. 
 
 CVNADA 
 
 \V. \V. CuHY, C.M.U., D.putu .Vmulfr. 
 
 PUBLICATIONS 
 
 OF THE 
 
 Dominion Observatory 
 
 OTTAWA 
 
 fT^'' 
 
 <-f.i>'^w 
 
 „ y,o>' VX. F. Kino, C.M.G., LL.D., Direclor. 
 
 Vol. I, No. 13 
 
 Orbit of I Persei from the H and K 
 
 Lines 
 
 BY 
 
 J. H. CANNON, M. A. 
 
 D 
 
 CAl 
 
 MT U03 
 POl-13 
 
 OTTAWA 
 Government Printin<; Bureau 
 
crniFPOIYTFrH-llOME BIRUOIHEOUF 
 
Erni E POLYTECHrJlOUE BtP 
 
 I IP 
 
 T I I r r, I I 
 
 DEPARTMENT OF THE INTERIOR 
 CANADA 
 
 Hon. W. I. Rnr.,r, Sl,n,.l^. W. W. C<iRT, CMC, Dnmly SfmMf. 
 
 PUBLICATIONS 
 
 
 OF THE 
 
 Dominion Observatory 
 
 OTTAWA 
 
 W. F. Kino, C.M.G., LL.D., Director. 
 
 Vol. I, No. 13 
 
 Orbit of I Persei from the H and K 
 ,)a- Lines 
 
 BT 
 
 J. B. CANNON, M. A. 
 
 62643—1 
 
 OTTAWA 
 Government Printing Bureau 
 19U 
 
A~- rSS- JL 
 
OIJIMT OF ^ PKUSKI FROM IHF // AND K LINES. 
 
 BY J. B. < ANN(»N, MA. 
 
 £ Pcrspi is one of those stars in whi"h tho v 'oritios n'ven by tho // 
 aiul K lines of caleium ditTer greatly from those from tlie broad hnes of 
 hydrogen and hehuni. The spcctnini is placed by .Miss Cannon in the 
 Oc.5B class. The lines showing are those of iiydroRcn, helium and ealoium. 
 A few iron lines appear, but not with sufficient fretiuency to make them 
 useful for measurement. The hydrogen an(' helium lines are very broad 
 and ill-defined, the latter lines especially b ing very poor. The calc um 
 lines are fairly good, sometimes both being easily measurable, sometimes 
 only one and in some cases neither appears sufficiently defined to make 
 measurement possible. 
 
 The first published measures of this star appeared in tho Astrophysical 
 Journal, Vol. XVIII., p. 383, 1903, five measures being given of the broad 
 lines in an article by Profes.sor Frost under the heading— "An Orion Star 
 of Great Radial Velocity." The range (9 kilometres) was not considered 
 sufficient ground to pronounce it a binary. Later in the Astrophysical Journal, 
 Vol. XXIX.. p. 236, 1909, Professor Frost announced another measure of 
 this star giving a range of 30 kilometres. In that note he remarked that 
 the H and A' lines have a moderate positive velocity with a range of about 
 25 kilometres, these lines differing greatly in the velocities shown from the 
 values derived from the broad lines. 
 
 Observations on the star were first made here in 1908, a few plates 
 being taken. It was then dropped from the observing list until 1910, and 
 6204.'?— 2 
 
:<.-)ii 
 
 ITHIKMION-* I'K IH^ l>"MIM"N ' '11>K1(\ \ I i 'II V 
 
 , , ■, .1,. ■,,„.r,n< nf "'n<t-n i.u! 1011-12. AltlmUL'li tllO 
 
 plates wivr lakcii hi ilic >ra.^ons n. ..m ii .i-- i 
 
 l,r..M.l liiu- u<Tr inraMirr,! at lir-'. uli^v inraMin'inrnt waM'"-^*''!'- •'-^^'■" 
 
 as // aiul /\. it wa- not iVIl that ili,.-r ,lilTii-c lim- w<.iil'l !"• "f aiiv ai'l m 
 
 aMvrtaiitttij: a.ivthi.m it. ivnanl tc, tl„. ..rl.tl of the >iaf. aiM atimiiot, «a< 
 
 piv.-n aliito>l ..Nc'iiMsrlv ,., tl„. // M, 1 /v 'in'- of ralntim TIm-.' Im- wm- 
 
 „ut alway- fuuna ot, ilir platr,. l.iit t;rnrtallv otir or uthn- of ilirtn 
 
 was urll .-.HHmh WHil.c.l to 1„. iMraM.iv,! Of thr I'.MtS plates uiilv tu„ 
 
 nave ineasMHs „f K wlii.l, unv .•oiim.I.tcI ivhal-l.'. of tlir later |>late^. I'.MO- 
 
 n-rj. II I'lati- were PmmI elio'.mll to he lIM-ful ill llie ilelenililiat ioii of the 
 orl.it. The later plate- were all Se.'-l 2:i ana uere iniieh better than the 
 earlier ones of Se,d ■.':. althouiih the Ime-iirained plaie di.l not -erve |„ 
 make the l.roa.l lin.'s inea-nral.le. As -tate.l ahove. these l.road lines were 
 nieastire.l at first An attempt was also made tu p't measures on the 
 memlier- of the -eeond series of hvdroiien with a view to (leterininiliil the 
 wav.-leniiths „f th.'se lines in this .tar. l)iit the Utter iinpo-Ml.ility of any- 
 thinj: definite in tlii- regard led to the atumdonmeiit uf the attempt. 
 
 Th,. wave-l.^n^iths t.sed for // and K were W.SC.L'.-, and :VXV.\S2r, 
 rosp.^etively. A' was. with very few eNee,)tions, stroiiiier than //. Some 
 plat.'s wetv found in which // and A' t;ave widely ditY.Tent results. In 
 such a ease, if the lines were e(,ually titxid, tlie plate was left out of 
 consideration: if one was nnu-U l)etter than tlie other that line wa.s used. 
 
 Croat aid was trivcn in the work l.y the u.so of Verkes measures of t.'ii 
 plates kindly sent me l.y Professor Frost, and of nine more plates loaned 
 hy I'rofes.sor Frost and measured l.y me. As a check on tiie measures (.f 
 a i.hite. h.'r.. and at Verkes, two plates IBlll iuid lMi)2 were measure.l 
 at l.oih i.laces. o„ ,„„. ,,f the.se. IIi4t)2, the measures were i.ractically 
 the same, l.ut on the other, not to(. well-defined, a dilTerence of ten kilom<-tres 
 was found. Of the nine jilates taken at Verkes and measured hero, 
 unfortunat.ly tour (.f them {tavo // and K difTerinp; considorahly. wiiile one 
 of them fiave <.nly // measurable. Otherwise the Verkes plat(>s fit tlie 
 accepted curve as well as can he oxi.ectcd from a spectrum which sivos 
 onlv one and at most two lines on which to base rosults. 
 
iiKBir »i 
 
 SHSEI KKDM IIIK // AND A MNEH. 
 
 357 
 
 TiM.' I i;i\.- ^crkes plaic- in.aMir.il iit Ycrkrs; Tuhlo II. Yrrkes 
 plat.T. iiKiiMHv.l l.v Caruiun; aii.l Tal^l.' ill. nucs Ottawa ohservatioiiB. 
 
 iMiii; 1 
 m;rkl.s ohst.Kv \Tii'Ns mi:a>i iu;i) \i \i,uki> 
 
 I'Ulr 
 
 nil 
 
 ll'i 
 I tl 
 IT'i 
 ■jci.i 
 
 4ti.-, 
 
 Date. 
 
 I (lori 
 s,.,,. ■.'.•, 
 (p,i iii 
 11,1 J:f 
 Nov- 7 
 !).•<•. 1 ... 
 
 l!H)t 
 April l.i 
 Sopt . HO 
 Dei- :«) 
 
 IW. 
 AiiE 10 
 
 ' ! ' ! I 
 
 Julian l)ii> l'llH..<i' l.llii-< \'l ^^' '*-*^- 
 
 nr.,l->l Ml 
 
 (i :i71 
 
 lilt K| 
 
 .-, (lis 
 
 411 :s 
 
 .-1 1H7 
 
 42(1 7W 
 
 fi.Vt.'i 
 
 t.'<(l !<)'> 
 
 ■-' lltil 
 
 ITU .VI 
 
 (M1!I7 
 
 .".Ml iK) 
 
 11 .">:(J 
 
 7.-.» <i:i 
 
 1 1I.H7 
 
 M.5 .if. 
 
 1 :).-)! 
 
 4i7,4;t;j .s'.i 
 
 .-, MK) 
 
 ■J'l i. 
 
 + tl 
 
 f II) 
 
 + -2:1 
 
 4 1(1 
 
 ■Jl 
 
 1+ 23 
 
 + 4 5 
 
 + B-2 
 
 -I6-6* 
 
 - 8-7 
 + ll'4 
 + 0-5 
 
 + «7 
 
 - 8-1 
 + 4-3 
 
 + »-6 
 
 *Canriiiii'« Mi-a»uri>, -flit, Hinnlual -li li 
 
 s.M) 
 S7'J 
 
 mr, 
 
 Uflfl 
 
 ijos 
 
 1216 
 
 r.'fio 
 
 r.'H!) 
 
 1350 
 
 TAiii.i; 11 
 
 VEKKEri l'L.VTi>-Mi;.U!L"Hi;i) BV CANNON. 
 
 Plntc 
 
 1 
 i 
 
 Uiiti'. 
 
 i 
 
 IB' 
 
 ' 
 
 i 
 1006 
 
 
 I 
 
 Oct. 12 
 1907 
 
 Jan. 4 
 
 Oct. U. 
 
 Oct. 18. . 
 
 Oct. 20.. 
 
 Nov. 30. 
 
 Dec. 16.. 
 1908 
 
 Jan. 20.. 
 
 RcrnarkH:- 
 
 1109. 120H 
 
 1289 
 
 1350 
 
 ;/ and K ilifTiT. 
 
 // is hii^hlvj+jvc 
 
 // IS much morc3+ ve. 
 
 6i643- 2i 
 
:i5K 
 
 prBl.IC.VTlONS OI- THK DOMINION OBSKIiVA TOUY. 
 
 TAUI.F. Ill 
 
 oITVWA (IHSKKVVTIONS oK { I'ERSEI. 
 
 PIhIi' 
 
 1974 
 
 1W>'.' 
 
 37ii.'i 
 ;!777 
 3M7 
 
 :Wii 
 :)■-■< 1 
 
 3921 
 
 3929 
 
 :i93ti 
 
 3957 
 
 3962 
 
 3974 
 
 3991 
 
 4020 
 
 405C 
 
 4067 
 
 45S2 
 
 4634 
 
 4645 
 
 4676 
 
 4685 
 
 4690 
 
 4718 
 
 4729 
 
 ■ 38 
 
 4745 
 
 4758\ 
 4759 J 
 4779 
 
 
 P' 
 
 c 
 
 c 
 c 
 p 
 c 
 c 
 P' 
 
 Date. 
 
 1' 
 
 C 
 
 P 
 
 C 
 
 I" 
 
 P 
 
 c 
 
 H 
 C 
 C 
 H 
 C 
 P' 
 P' 
 P 
 P>-C 
 C 
 I" 
 H 
 H 
 
 C 
 
 P' 
 P' 
 
 c 
 
 190S 
 Nov. -20 
 Dec 4 
 
 I'.IIO 
 Oct. 10 
 Oct. 19.. 
 Oct, 2.5 
 
 Dec. r, 
 
 DtT. 12. 
 
 Dec. 16 . . . 
 1911 
 
 .I:m -< ■ . . . 
 ^Jiin. 9 
 
 }Jan 12 .. 
 
 Jan IG 
 
 ■Jilll IS 
 
 jjan. 19 
 jjan iiO 
 iFcli. 10 .. 
 [Feb. 27.... 
 IMar. 6 ... 
 iMar. 7, . .. 
 Sept. 13. 
 
 Oct 1-2 
 
 Oct 13 
 
 Nov 2 
 
 Nov. 3 
 
 Nov 10 . . 
 
 Dec 
 
 Drc 19... 
 
 Doc 25 
 1912 
 
 'jail. 1 . 
 
 iJan 10 
 
 'Jan. 10 
 
 'Jan. 12... 
 
 in. 
 60 
 40 
 
 62 
 S5 
 45 
 60 
 76 
 42 
 
 40 
 
 43 
 
 65 
 
 48 
 
 45 
 
 60 
 
 60 
 
 50 
 
 55 
 
 50 
 50 
 55 
 60 
 tiO 
 BO 
 59 
 62 
 67 
 40 
 40 
 
 55 
 51 
 49 
 90 
 
 Julmn Day ''lia«c. Liuea 
 
 2.41H,2Wi s;t 
 280-72 
 
 957-83 
 964-81 
 970 91 
 9,011 61 
 018-68 
 022-79 
 
 042 54 
 046 54 
 049-55 
 053-58 
 055-57 
 056 -5S 
 067 -6t) 
 079-56 
 
 mn 5S 
 
 11)2-50 
 103-52 
 293 89 
 
 403 5,S 
 412-50 
 412 5:5 
 414 60 
 
OKBIT OF ^ I'KKSE' FKOM THK H AND K LINES. 
 
 359 
 
 Plate. 
 
 4801 
 
 4819 
 
 4828 
 
 4831 
 
 4833 
 
 4839 
 
 4843 
 
 4S4B 
 
 4863 
 
 4818 
 
 48W 
 
 4874 
 
 T.\H1.E III. 
 OTTAWA OBSEUVATIONS UF £ yEHHEl-Concliukd. 
 
 t 
 
 I 
 O 
 
 Uutc 
 
 P' 
 H 
 C 
 V 
 
 r 
 
 H 
 C 
 H 
 II 
 C 
 H 
 C 
 
 I'.t .. 
 
 ■20... 
 
 1 
 
 10... 
 
 12 . 
 
 13... 
 Fib. 14... 
 Feb, 20,,. 
 Feb 23.. 
 Feb. 28... 
 jMar. 5. . . 
 Mar. 6. . . 
 
 .liin. 
 ,I:m. 
 I'el). 
 Feb. 
 Feb 
 Feb 
 
 a 
 
 m. 
 93 
 93 
 108 
 90 
 90 
 98 
 87 
 90 
 87 
 92 
 86 
 89 
 
 Juliiiii Day. 
 
 Fhuwe 
 
 l.ll.ea. 
 
 Vel 
 
 Wt 
 
 ■J. 421 Ii2 
 
 5-543 
 
 // A- K 
 
 + 
 
 21-0 
 
 428 56 
 
 5 533 
 
 K 
 
 + 
 
 15-U| 
 
 434 ."il 
 
 4 . 533 
 
 H A- K 
 
 + 
 
 21-8 
 
 443-52 
 
 0-593 
 
 K 
 
 + 
 
 21-2 
 
 445 55 
 
 1-672 
 
 II A K 
 
 + 
 
 11 9 
 
 440 53 
 
 2-652 
 
 II A K 
 
 + 
 
 7-3 
 
 447-53 
 
 3 6ri3 
 
 II A K 
 
 -t- 
 
 21 
 
 4.^3-56 
 
 2 732 
 
 11 A- K 
 
 + 
 
 14-U 
 
 450- 58 
 
 5- 753 
 
 K 
 
 4- 
 
 17-S 
 
 401 .54 
 
 3-763 
 
 II A K 
 
 + 
 
 21-0 
 
 407. 55 
 
 2 822 
 
 K 
 
 + 
 
 14 2 
 
 468-55 
 
 3 813 
 
 ^ 
 
 + 
 
 150 
 
 0-C". 
 
 _ 
 
 
 
 5 
 
 + 
 
 
 4 
 
 + 
 
 
 2 
 
 - 
 
 
 2 
 
 + 
 
 
 6 
 
 + 
 
 
 
 
 - 
 
 
 
 
 + 
 
 2 
 
 y 
 
 + 
 
 1 
 
 -7 
 
 - 
 
 3 
 
 -2 
 
 •P-PUlkett. ll = Harper. P'-ParkM-. C-Cannon. 
 
 3908 025 
 3933 S2 5 
 
 1B= S,10 
 
 Vel \Vt 
 
 MEASIRF-S UF £ PEllSKl 
 Verkeb I'lateB. 
 
 1H= S79 
 
 Vel. \Vt 
 
 lU' '.i:i5 
 
 Vel. : \Vt 
 
 12 10 1 
 
 Weinlltol 
 
 niejiii 
 
 V, 
 
 Vj 
 
 Ciirv. 
 
 Radial 
 Velocity 
 
 - 12 10 
 
 + 20.90 
 
 + -04 
 
 30 
 
 + 14-5 
 
 - 15-18 J 1+ 38-05 J 
 
 15 1" 
 
 19 -S9 
 
 -02 
 
 30 
 
 + 4 45 
 
 + 38 05 
 - 18-74 
 
 + 11 
 -30 
 
 + 19-3 
 
 IH' 1199 
 
 Vel. \Vt 
 
 in> 1208 
 
 IB' 1210 
 
 Vel. \\t 
 
 20 54 i 
 
 _ 
 
 20 
 
 54 
 
 + 
 
 20 
 
 24 
 
 -t- 
 
 
 07 
 
 " 
 
 
 30 
 
 
 
 
 -5 
 
 23 44 i 
 
 Vel. Wt 
 
 IB' 1260 
 
 Vel. Wt 
 
 3. 20 1 + 005 i 
 0-05 H ... 
 
 - 23 44 
 
 + 17 09 
 
 + -14 
 
 30 
 
 - 5 9 
 
 - 4 19 
 
 + 16.90 
 
 07 
 
 30 
 
 + 12-3 
 
 05 
 
 2. 47 
 
 07 
 
 30 
 
 + 34 
 
i(iO 
 
 I'rni.icArioNs ok thk. domimon (mM;i{\ mokv. 
 
 MEA-sruKs or I i'i;usi:i c.iuunutd. 
 
 X 
 
 1H> IJs'.i 
 Vel. Wt 
 
 I If i:i.-,o 
 
 
 
 1 
 
 
 
 
 
 V.-l, Wt 
 
 Vrl. Wt 
 
 Vil Wt 
 
 ! 
 
 \.l Wt^ 
 
 V.l. 
 
 Wt 
 
 V.l. 
 
 Iwt. 
 
 
 ^ l^ Hi 1 
 
 1 
 
 • I.! '.>1 1 
 
 
 i 
 
 i 
 
 
 1 
 1 
 
 3<M)H li J.'i 
 
 
 1 
 
 1 
 
 . .1 — 
 
 3',«;t vj,-, 
 
 
 
 ! 
 
 ( 
 1 
 
 Weightwl 
 
 nu'jui 
 V, 
 Vd 
 
 Ciinv 
 
 r lS-4i; 
 
 10 ;(■< 
 
 1- 14 
 ■30 
 
 + 4:1 (11 
 
 - Jl 11 
 + 11 
 
 - -30 
 
 
 
 
 
 
 Ka.li:il 
 Velorit> 
 
 t 7 it 
 
 -t 1^ li 
 
 
 
 
 
 
 3<H)S t)'2.") 
 3'j;W HJ.-i 
 
 \\v ttlltlil 
 
 \, 
 
 Curv. 
 
 I'.i74 
 
 \-.l Wi 
 
 MKASIHF.S Ol- £ 1'1;HSK1 ('oulvuwd. 
 Uttawa I'ltttcn. 
 
 I'.i74* 
 
 + 17 31 i 
 
 \'cloritv 
 
 . 17 :il 
 • J :i 1 
 
 ••-'S 
 
 V,! Wt 
 
 + 15-28 I 
 
 . l"i ^^ 
 
 t ^ ;!. 
 
 21 
 
 + 19 1_ 
 
 Clink Mi.-t.-iiriiiicm 
 
 V.l Wt 
 
 V.'l. Wt 
 
 + 32-94 I 
 
 ;74(i 
 
 V.l. Wt 
 
 V.l. wt 
 
 11 
 
 ■2» 
 
 + 2a m I 
 
 ( ■-".I n, 
 
 4 lid 
 
 11 
 
 •28 
 
 (i .;7 1 I 
 
 10 73 1 
 
 '.I .'4 
 
 ii:i 
 28 
 
 ■J4 1 I i 10 :t 
 
 - 12 10 i 
 
 •28 
 
 v.l. Wt. 
 
 + 1 Oli I 
 
 •J (17 
 
 + 14 70 
 
 14 
 
 •28 
 
 17 3 
 
(JUBII OF k I'HKSKI KKOM IHt; II ASl) K LINKS. 
 
 :wi 
 
 MKASrUK.-i OF £ rKU.SKI Conlunml 
 
 
 3777* 
 
 .1M7 
 
 :iS17' 
 
 UMil 
 
 li.MU* 
 
 asM 
 
 :v.nr, 
 
 
 X 
 
 \r\ W t 
 
 , 1 
 
 V.l \\i 
 
 i 
 Vol. Wt 
 
 Vel. Wt 
 
 \,-\. Wt 
 
 1 
 
 \\\ Wi, 
 
 \,i 
 
 Wt. 
 
 3<.t:i:r»2.') 
 
 + 210 1 
 
 1 ;jo .SI) i 
 
 r 11 -t i 
 
 ,- 2.s^<ir) i 
 
 1 
 
 f ,•(.-.■ Ill 1 
 + 2;mi7 i 
 
 1 
 l^ . 
 
 + i.l-U i 
 
 + 20-20 
 + 19 ."..i 
 
 i 
 
 « 
 
 Wi'inhii-.! 
 
 \ . 
 
 V, 
 Ciirv, 
 
 , II 27 
 
 t 1 1 711 
 
 11 
 
 ■2s 
 
 , an s<; 
 
 II.') 
 ■2S 
 
 f 41 :!0 
 
 - :,02 
 
 ■ 0.") 
 
 — 2S 
 
 + 36^0 
 
 f 2S ■'■•.■) 
 
 - S .")2 
 
 ■04 
 
 ■2S 
 
 + ;t2^'.t4 
 
 - S .V2 
 04 
 •2.S 
 
 + 25- 13 
 
 - 10 .ll 
 
 ■ U\ 
 
 — ■ -S 
 
 + 23 
 
 - I'.l 
 
 98 
 14 
 02 
 28 
 
 Kadiul 
 Velocity 
 
 + 14^7 
 
 + 31-5 
 
 + 200 
 
 + 241 
 
 + '^ - 
 
 + i -, 
 
 •Cliw!- Mi'usurcment. 
 
 MK.VSIHK.-; Ol- £ I'KK.-iKl ( .."/iM...i. 
 Oltawj. I'liili-s. 
 
 
 31.11 ."i 
 
 * 
 
 3021 
 
 1 
 \fl Wt. 
 
 3'.i2',l 
 
 3030 
 
 30." 
 
 a',i,"i7* 
 
 3'.l(i2 
 
 X 
 
 Vel. 
 
 Wi 
 
 \A. Wl 
 
 i 
 
 1 
 
 V,l Wt 
 
 i 
 V,l Wt 
 
 Vfl. Wt 
 
 V,l Wt. 
 
 1 
 
 :i<.ios-ri2.', 
 3033 S2.") 
 
 , J7 74 
 + 34 00 
 
 1 
 
 t 47 -AY. i 
 + 0.')-40' i 
 
 + 24 03 J 
 
 + 24 03 
 
 - 21 110 
 
 •- -02 
 
 • 2s 
 
 + 2-7 
 
 + 4H0',I 5 
 
 + 34 •20 1 
 
 j 
 +■ 2S-37 ; 
 
 -f 30 15 1 
 
 + 2071j 1 
 
 Wi'iKhtiil 
 
 lln-rili 
 \ , 
 
 Cmv. 
 
 i :ill ll."i 
 
 I'l 11 
 
 112 
 
 2s 
 
 + 10 tt 
 
 4- .->0 III 
 
 - 20 01 
 
 I'l 
 
 - •2S 
 
 + 35-5 
 
 + 4SO0 
 
 - 23 01 
 
 ■07 
 
 — 2 s 
 
 + 24^7 
 
 + 34 20 
 ~ 23 02 
 
 - 04 
 
 - 28 
 
 + 2M-37 
 
 - 23 1)2 
 
 1)4 
 
 - 28 
 
 + 2740 
 
 - 23 01 
 
 07 
 
 - ^28 
 
 Kdilial 
 
 Vcli).-ilv 
 
 + 103 + 4 1 
 
 + ^ ' 
 
 •Cliifk .Mciusuri'iiii'iit. 
 
3(i2 
 
 PrBLUATIONS OK THK DOMINION OBSEUVATOKV. 
 
 MKASriiES OF i rEKSEI-r,.iirmu(vi. 
 Ottawa Plates. 
 
 
 3974 
 
 .1991 
 
 4020 
 
 111211" 
 
 lii.M; 
 
 40.W 
 
 tlM17 
 
 X 
 
 V,l W I 
 
 \ ■■! 'A 1 
 
 Vrl, \Vl 
 
 V.l \Vi 
 
 Vrl \\1 
 
 1 
 
 Vil, \M 
 
 1 
 
 Vrl. \Vt. 
 
 3968 025 
 3933 ■y25 
 
 
 + 42-10 1 
 
 + 42^9:J 1 
 
 + 45 84 1 
 
 1 ■■ 
 
 + 46^G8 J 
 
 1 
 
 !■ ■■■ 
 
 + 45 01| 1 
 
 1 
 
 + 43-76; I 
 
 + 34-19, i 
 
 Wfifthtcil 
 
 itu'an 
 V,, 
 
 Curv. 
 
 + 43 711 
 
 - 27 il^"' 
 
 - 211 
 ■28 
 
 t- 42 10 
 
 - 2S3> 
 
 13 
 
 ■28 
 
 -r 42 93 
 
 - 2s^'.«i 
 
 21 
 
 - 2S 
 
 ,- 4,-, M 
 
 - 2s ijli 
 
 21 
 
 - ■ 28 
 
 -t- 4li lis 
 
 - 2S 47 
 
 13 
 
 - 28 
 
 r 45 01 
 
 - 2s 47 
 
 13 
 
 ■28 
 
 r .'A 19 
 
 - 2H 30 
 
 19 
 
 •28 
 
 lluJuil 
 Veloi'ity 
 
 ^ ltJ2 
 
 + 13 3_ 
 
 + 13-5 
 
 + ie-4 
 
 + 178 
 
 -r III 1 r 5 4 
 
 •Check Measurement. 
 
 ME.\srRES OF £ PEK.SKI— ''„i,(iMif.(. 
 Ottawa Plates. 
 
 
 4552 
 
 4634 
 
 4634* 
 
 41115 
 
 404 S* 
 
 41170 
 
 41170* 
 
 X 
 
 Vel. ' Wt 
 
 V.l Wt 
 
 i 
 
 V.l \Vi 
 
 1 
 
 V.l. Wt 
 
 Vil. Wt 
 
 1 
 
 V.l W t 
 
 V.-l ' Wt. 
 
 i 
 1 
 
 3968 625 
 3933 825 
 
 - 23().S i 
 
 - 4 81 1 
 
 - 33 1 
 
 + 10 11 1 
 
 + 12 15 1 
 
 + 996 i 
 + 10 56 5 
 
 + 5^24j i 
 + 19-63j 1 
 
 Weighted 
 
 ini-an 
 V, 
 
 v.. 
 
 Curv. 
 
 - -23 08 
 
 -i 27 114 
 
 +- 02 
 
 ■28 
 
 - 4 81 
 
 + 19 99 
 
 -r 07 
 
 ■28 
 
 - 11 33 
 
 .f I'l il'l 
 
 + (»7 
 
 ■28 
 
 f 111 11 
 
 t- 19 112 
 
 02 
 
 - .28 
 
 + 12 15 
 
 + 19 02 
 
 112 
 
 ■28 
 
 . 13 2il 
 
 T 11 43 
 
 1)9 
 
 ■28 
 
 -, 14 80 
 
 f 11 43 
 
 1)9 
 
 - 28 
 
 Ka,ll..l 
 Vi-loi'itv 
 
 -. 4 3_ 
 
 + 155 
 
 + 19-4 
 
 + 29-4 
 
 + 31-5 1 + 24-3 
 
 + 25-9 
 
 •Check Measurenicnl 
 
ORBIT OF i PKHSEl FROM TIIK H AND K LINES. 
 
 363 
 
 MEASrUKS OF i PEIISEI— ('onliiiuni. 
 Ottawa Flutes. 
 
 4«85 
 
 \.-l. \Vt 
 
 3yt>H-(')2.") 
 
 3'J33-K25 
 
 Weixhtcd 
 
 mean 
 
 V, 
 
 \\, 
 
 Curv. 
 
 486.5* 
 
 4690 
 
 V,-l. Wt. 
 
 r 4-l« J 
 
 + 4 16 
 
 + U) 94 
 05 
 ■30 
 
 + 6-32! 
 
 Itiidiiil 
 
 Velocity I + 14-H 
 
 + 6 32 
 
 + 10 94 
 
 05 
 
 -30 
 
 V,-l. Wt 
 
 4690* 
 
 + f frl 1 
 
 + 8-t)4 
 
 + 7-63 
 
 + -07 
 
 -30 
 
 Vcl Wt 
 
 4715 
 
 V.-l Wt 
 
 + 16 9 
 
 + 10 07 1 
 
 + 1007 
 + 7 63 
 
 + m 
 
 30 
 
 + 101 
 
 4715* 
 
 Vel Wt 
 
 4729 
 
 Vel. Wt. 
 
 + 31 80 { 
 
 + -MM 
 
 - 5 38 
 
 - 02 
 ■30 
 
 + 30871 4 
 
 •Chi-ck Measurement 
 
 + 30 87 
 
 - 5-38 
 
 -02 
 
 30 
 
 + 18-22! } 
 
 17 5 I + 26 2 I + 25 2 
 
 + 1822 
 
 - 11 75 
 + 06 
 
 - -30 
 
 + 6-2 
 
 MEASURES OF { PERSEI— Con/inued. 
 Ottawa Platea. 
 
 Weighted 
 
 
 
 mean 
 
 + 
 
 16-72 
 
 V. 
 
 - 
 
 1 1 75 
 
 V, 
 
 + 
 
 06 
 
 Curv. 
 
 - 
 
 30 
 
 Radial 
 
 
 
 Velocity 
 
 + 
 
 4 7 
 
 •Checlj 
 
 Meaaureiuent 
 
 + 33-93 
 
 - 20-90 
 + 10 
 
 - 30 
 
 + 38 35 
 
 - 21-63 
 
 -07 
 
 - 30 
 
 + 12-9 
 
 + 16-4 
 
MA 
 
 I'l BLICAIION^ <>1- nil. UMMIMON ousKin \rnuv. 
 
 MKAsriu.s oi' £ i'i:i;si:i cimiimiai. 
 
 Uttawii I'hitca 
 
 3908 ta.') 
 3933 S'jr. 
 
 Weinhteil 
 
 iin'an 
 
 V, 
 
 V,, 
 
 (.'urv. 
 
 V,l \\t 
 
 \,1 \\i 
 
 + 42-52 1 
 
 *■ 42 ■".-' 
 
 - Jl i'..S 
 
 117 
 
 30 
 
 + 44-41 i 
 + 47-09 1 
 
 \ , 1 W 1 
 
 ivl'l 
 
 \r| \\t 
 
 Hailml 
 Vflurity I + 20 -r) 
 
 •Chr.k Mi:iMinii»-m, 
 
 r 411 .■>■. 
 
 - 23 sT 
 13 
 30 
 
 + 40 4-| i 
 + •45-H4 1 
 
 T tl 01 
 
 - 23 ^7 
 13 
 30 
 
 l^l'i* 
 
 \v\ \\i| V.l Wi 
 
 + 33-50 1 
 + 40-10 1 
 
 t I'l 
 
 .is Ml 
 
 2,". 71 
 
 U.'. 
 
 •30 
 
 + 42-03 
 
 . 12 '."3 
 
 - 2.". 71 
 
 (t."i 
 
 ■30 
 
 + 45- IH 1 
 
 + 50 00 1 
 
 + 40.03 
 
 - 21'. (to 
 
 («l 
 
 30 
 
 V,-l \Vt, 
 
 .■)4-83 i 
 
 f .-,4, S3 
 
 - 2H 30 
 
 (17 
 
 ■30 
 
 .'1 s I • 20 1 
 
 M!:\srHi'..s nv J iT.r.sKi <;,„iinH,'i. 
 
 Ottawa I'lttltii. 
 
 (Sir 
 
 v.l w 
 
 \ ,1 w t 
 
 4s3.i* 
 
 30()S 02.') I 
 
 3033 v2.-| I- 1.". 1"! 
 
 Weighted 
 
 mrriti 
 V, 
 Va 
 
 Curv. 
 
 + 4.-. 1X1 
 
 2s 30 
 
 07 
 
 -30 
 
 + 4H.HS ■ 
 
 + 32 o:i 1 
 
 2S .'.<) 
 ■ 12 
 -30 
 
 V.l \\l 
 
 V,-l \\t 
 
 + .72-0t> i 
 + 30 10 5 
 
 |sl:i 
 
 \V1 \\i 
 
 + 40 SI \ 1+ 45-Oi: { 1+ 39-tiO } 
 + 3301 1 1+ 52-501 1 1+ 44-43 1 
 
 Vll, W!, 
 
 Vil...-llv 
 
 13 I'.l 
 2S .'.0 
 
 ■ 12 
 
 ■ ;«) 
 
 :ir> ■ 2."i 
 
 2s III 
 (17 
 3U 
 
 10 
 ■30 
 
 ).; 11. 
 
 2'l (13 
 
 11. 
 
 ■30 
 
 + 47-34 1 
 
 t 47 ,i4 
 
 - 20 I HI 
 
 20 
 
 ■30 
 
 I 1 nil I • 17 s 
 
 •Check M.^ii-iiriiii.iii 
 
UUBl 
 
 T OF i J'KKSKl moM TIIK // AND K LINKS. 
 
 :u\'> 
 
 MKASria>! OF £ I'KltSKI '■„„r/.w..r 
 UtUwa rUttes. 
 
 Uadiul 
 Velm-ily + -1 '' 
 
 Tho iHTiud finally decided on after a great many trials was G-951 days. 
 There are sonu- fairly large residuals but the probable error of an average 
 pl,l, is ♦30, and that is v.ry satisfactory when one considers that many 
 values are dependent on one line which is not always very well dehned. 
 
 The observations were grouped into eleven norn.als which appear in 
 Table I\'. (The phases are from the Hnal 2'j. 
 
 lAlU.E IV. 
 
300 
 
 I'lBl.UAlln.NS OK nii: DOMINION OBSKHVATOHV. 
 
 Prpliniiiiiiry tlomciit.s for the orbit follow;— 
 
 Period =t)'.t.")l (lays 
 
 .' =1 
 
 w =150° 
 
 /v' =7-7r) km, 
 
 T =2,llS.2H»;M'.t .1 1). 
 
 y =+ir)-92 km. 
 
 ()l,sorvati..n .H,uations wore form..! un.l a soluiion put through uith 
 
 utioii to thr true valiios ot thf 
 
 the object of sjettinii a closer approxim 
 elements, 'I'ho ()b>ervatioii (-(luations found were: 
 
 No. 
 
 TAIU.K V. 
 0B.-KKVAT10N l.yf.VTIONS 
 
 i 
 
 1 
 
 
 •4lil • - 
 
 U9 
 
 + 
 
 ■786 
 
 2 
 
 1 , + 
 
 ■786 
 
 87H 
 
 + 
 
 ■ 139 
 
 3 
 
 1 ; + 
 
 911 
 
 ■925 
 
 + 
 
 019 
 
 4 
 
 1 + 
 
 '881 
 
 - 
 
 ■.')19 
 
 - 
 
 303 
 
 5 
 
 
 + 
 
 ■807 
 
 - 
 
 ■130 
 
 - 
 
 ■ 499 
 
 e 
 
 
 + 
 
 ■446 
 
 + 
 
 ■ S39 
 
 - 
 
 •8'J<) 
 
 7 
 
 
 
 •497 
 
 + 
 
 •235 
 
 - 
 
 ■962 
 
 g 
 
 
 „ 
 
 1064 
 
 - 1 
 
 UOI! 
 
 - 
 
 261 
 
 g 
 
 
 _ 
 
 1024 
 
 - 
 
 m-> 
 
 ■+ 
 
 299 
 
 10 
 
 
 _ 
 
 ■699 
 
 + 
 
 ■ 7- ( 
 
 + 
 
 740 
 
 11 
 
 1 
 
 — 
 
 ■268 
 
 + 
 
 ■975 
 
 + 
 
 93.J 
 
 in which. 
 
 X =57 
 
 z =K8e 
 U = A'5aj 
 Kubl 
 
 
 
 
 
 
 
 
 (1-t 
 
 ')i 
 
 
 
 _ 
 
 694 ' 
 
 _ 
 
 396 
 
 _ 
 
 057 
 
 + 
 
 21H 
 
 + 
 
 410 
 
 + 
 
 840 
 
 + 1 
 
 0tJ6 
 
 + 
 
 253 
 
 _ 
 
 395 
 
 _ 
 
 ■812 
 
 — 
 
 919 1 
 
 Wi'inlit . 
 
 -r 0.S0 
 
 3 
 
 - 0-419 
 
 1 
 
 + 3 (XK) 
 
 10 
 
 + 1100 
 
 2 
 
 - 2 780 
 
 2 
 
 + 2 020 
 
 15 
 
 + 3 830 
 
 10 
 
 - 4 560 
 
 10 
 
 + 1 550 
 
 2 
 
 + 920 
 
 15 
 
 - no 
 
 15 
 
„UHir OK ; 1'Kltr.Kl KKOM TIIK // AM> A LINKS. 
 
 ■M\7 
 
 The result inn lumiiiil (Miuuti.)ii> sNiTc:— 
 
 17 5x +2()U7v -1<)04^ +l-7o2» -2mr +(i Os;^ = () 
 
 9.5547 -lH7tL' -1 405. +l-4'J',tr fO 1H() = U 
 
 0-7^1)2 +0')'.):^/ -()-.',5:5r +512H = 
 
 7-230i( -t)-9st;r -1 242 = 
 
 G-b-i.-M' +1-357 = 
 
 Solving tin.,, equations ,he e<,rnH.ti....s to the var.ous ele.nent.s were 
 
 found to be :— 
 
 5y =--52 
 
 6A' = 1 00 
 
 5e =-11 
 
 6w =-22^-47 
 
 57' = - .4<H) (lays. 
 
 There is one pecti'iari^v about these corrections, viz., 5. has the value 
 -.11 vhereas the prernninary value is only 1. This would seen, to 
 indicate that the orbit is circular and . indeterminate. This will be further 
 seen from the o.sciUations in the value of . in the following operations. 
 
 New preliminary values were taken in which, 
 
 c =05 
 
 a, =60° 
 
 A' = 7 -75 km. 
 
 T =2,418,247-607 J. D. 
 
 y =15- 00 km. 
 
 It mipht be stated here that the value of Ipw wa,s reduced by the 
 least squares solution above, the corrected « being taken as zero, from 74-7 
 to 73-2. With the new pr. liminary values, vprr was 72-5. It was 
 appar.>nt that anv solution would fail to make much reduction in the value 
 of Upvv, the signs being well .hstributed in the residuals. However a 
 least squares solution was made with the new preliminary values. 
 
:«)S 
 
 IM Hl.ir.UlO.NS OK IHK ixiMlMiiN (.ll>l-.ll\ A lolO . 
 
 Tl,.. ..l.s..rviiti(.n rnuntmns f,.rinr.l In.,,, i!,r „cw i.rrr,n„„iiry vii 
 ,is,m: ih.' >a,iir s,il.stit,iti„i,s a> t,rf..rc, w.tc as fnll<,w8:— 
 
 l,ic 
 
 OBwKRVATlON ^.^i^ ATUI 
 
 NS lUti.M SIO'MI llil I.IMIN MIV \ AUK; 
 
 1 I 
 
 2 1 
 
 3 t 
 
 4 1 
 5 
 
 + 
 + 1 
 
 + 
 
 ll'i 
 
 •HIT 
 
 + 
 + 
 
 ■<.m 
 
 + 
 -*- 
 + 
 
 ■ H7t> 
 
 ■ .VJ.'» 
 1)16 
 
 ■ :»H2 
 
 + 
 
 ■ HtM 
 
 ■J64 
 062 
 
 I 
 
 - 1 120 
 
 - MX) 
 + 3 010 
 + H90 
 
 - 3 3'2I» 
 
 1 It 
 1 II 
 
 ■2 
 
 -f 
 
 ■H4'.t 
 
 + 
 
 0«K) 
 
 - 
 
 WKt 
 
 + 
 
 (ilH 
 
 
 + 
 
 ■.Wl 
 
 -t 
 
 147 
 
 ■WW 
 
 - 
 
 ■'.IHCi 
 ■KM 
 
 + 
 + 
 
 1 (,3H 
 ■844 
 
 + 0^4M) 
 + 2 470 
 
 i l> 
 
 7 
 8 
 
 10 
 11 
 
 1 
 
 + 
 
 ■ is;i 
 
 + 
 
 ■213 
 237 
 
 + 
 
 IM 
 
 ■Jfil 
 
 - 4 620 
 + 1 370 
 
 1 
 ■2 11 
 
 1 
 
 71,7 
 
 + 
 + 
 
 •H'.tl 
 
 ■ 252 
 
 + 
 + 
 
 •tUS 
 ■883 
 
 
 OIH 
 ■S37 
 
 - 160 
 
 - 1 MO 
 
 IS 
 1-5 
 
 N(,riiml equations rcMiltinn tiici\'froiii were; — 
 
 17 -ox +-':nt;v +;Mw.-.: +\:mu -i •:<()> -7 -400 = 
 
 .(■711// -0071-- -l-»)t:5// +l(W.lr -Mt4=0 
 
 1()'J72.: -'2-.")7'^// t 2 .')17'' -l(iSS = 
 
 77:5.".-' -7-7i:)r -:MV.t = 
 
 7-7r_'r +:i-2sa=0 
 
 SdlviiiK tlicM', the corrections found were 
 
 ^y = + -.S4 km. 
 5A' = + -12 km. 
 !,r = + -022 
 
 6a, =+81' -SO 
 
 67' = + 1 -oil liiA-s. 
 
,„„.. .., c ,KK.K. KK..^. un, . ASO ^ ...XKS. 
 
 369 
 
 wliclK'r Mir 
 
 ,icw viilnrs nf thf .IriiKnl - 
 
 ^ =i:. HI km- 
 /v' = 7 s7 kill- 
 
 , = (IT.' 
 w =111 Mt 
 
 ,, „,,-..,■ ,..„>,„„-«,...»>.."> 
 
 It i- rai 
 till' iii-iuiii;il ^^ 
 
 lictwrcn CDtlipil 
 
 ..,lu...u, sva- .ua.l<. lor -L- >ak,- of .-.Mnpl.t ."..■ 
 
 ■n,, „,w ul.~r,vat.on rMuattups fuliuW.- 
 
 TMil.l Ml. 
 oasEUVATKiN i:gl VIIUNS i3) 
 
 -n„ ,,,nr>pon.riufi nunual .■quafun.s wore:- 
 
 ,,.,,+,,..4. +0.24.. 4-1-51.. -1-776. -l-37o = 
 
 .,.4;?0// -i-:n7. -i-r.r.:5. +i-*.o(.' "^ ■;.^; - 
 
 S, _ .',o7»/ + -(Xm. +l-t)o2 = 
 
 7.578. -7.394r -fl.:?71=0 
 
 7-2«2r -1 -073 = 
 
 (;.72Sz 
 
;i7(t 
 
 IM Ill.K \11'-N> i>l- IIIV DOMINION OH-iKIlVVToHV. 
 
 lOrr.T'tum- n-uliii.u fn-m lli- .-..hiti..n <.f Hm-c n,uiiti..M- w.Tf:- 
 
 6y ^ L tlO kill. 
 
 lli = + (10 km. 
 
 «w =-42" tV2 
 IT = -MO (lays. 
 
 Hpticc tho finally a<'cc>!>t<'ii clfiiifnts; — 
 
 p = ()'».') 1 flays 
 K = 7S7 kn>. 
 7 =ir)-4() km. 
 
 r = im 
 
 V =2.41S,21S ."^OS ,1. D. 
 
 A summary follows >howinn results of th.^ various solutions ma-lo in 
 the (Irfrmnuuion. Tl.r prohahlc errors are added in the last eolumn. 
 
 SUMMARY. 
 
 Klfrnfnt 
 
 K U:llf-.\mplitll.|r , 
 
 T Vi'l "f sysii'in 
 e KiTPntnnty 
 
 JAnpilnr <list;iiiin cif 
 (,) ■ IVruistriin from as- 
 
 rpndinK nfMlr. 
 T Time nf IVri^ytrfm ik\s- 
 
 II i-in 1 ' Mujoraxis A smcnf 
 
 iiirlin. 
 Prol). Krrorof N(ir. 
 
 Place, \Vt, I'nity 
 2pir 
 
 Prrlmimary. 
 
 After l»t . New After 2iia 
 
 Solulum Preliminary Snlutum 
 
 After nrrl 
 
 Sclutiori 
 
 .-, '.i.-pl ,l:nK f.051 (lavs ■ 6-951 days fi flSl HayK 
 
 7".i km. 7 S7 km. 
 
 l.'i l»i km. 15 40 km 
 
 141° 
 
 SO 
 
 •24y 
 
 118 
 
 b9 
 
 5 
 
 -■87km,+n KO 
 1.-, 40 km ±0 fiO 
 ■034 ±114 
 
 99°1S± IS" 49 
 
 •2W :f0H±i r)7's 
 
 7t ,«00 km 
 
 + 2 3 km. 
 68.2 
 
uumr "I 
 
 J iT.u-'n n!i>\i I in // wn s links. 
 
 ;i7i 
 
 M,,., u,.. ,.,,,,,.1..., ■; ti- ^-H.it .l<-nM„M.i.m frn.n tl,. .•al.-nun 1mu-s, 
 
 „,. n..>l.- U .!.■ l.n,a.l In,-- ..r- n^. 1 TU, d,tTuM.a... u, U.. 
 
 |,„„- 1 .V,.,-, :u„l .nn.MU-' u.H-.r.u,.. ^ of ,1,. nu.-un-s from -1..,m 
 
 „,,,.. n ,,u..'' >.,„ it.l.. .„ ...n,n. anv HliaM- .nt.,n.K.n,m .nm, .l.-m 
 
 S,„,.. uaonnaunn n, n.ar.l .•> .1,,... Hn, M hav.. l..,.. ^.■.•v ,n„.n.^tn.., 
 
 ,„„ i, ..,.„. ,l,a, >.. far w.. >nuM !„■ .unfn, u„l> -lu fa-, wind, ....us 
 
 ,,.,,..,1 ,h,. l.roa,l IH,..^ -iH.w a nn.,'!. In.l.T ,„m.>v,. v.lnrnv .hau ,ln- 
 // am! K lines. 
 
 lloininion Oh^rx atory, 
 Ottawa. 
 
 .luiic I'.n.'. 
 
 fT". 
 
 
 
 
 "1 
 
 
 
 
 
 
 
 
 
 
 
 
 1 
 
 
 ' 
 
 
 
 
 
 
 ' 
 
 
 
 
 
 
 ©- 
 
 
 
 
 
 
 
 -'- 
 
 
 
 
 
 
 
 
 L,/" 
 
 
 
 
 
 
 
 
 
 
 20 
 
 
 
 
 
 
 
 / 
 
 ^ 
 
 
 
 
 
 >> 
 
 \s, 
 
 
 
 
 
 1^ 
 
 c 
 
 
 o 
 
 
 ^ 
 
 
 
 
 
 
 
 
 \ 
 
 «_— - 
 
 o 
 
 1 . 
 
 10 
 
 
 ^ 
 
 
 
 ^^ 
 
 
 
 
 
 
 
 
 
 C 
 
 1— 
 
 1 
 
 o 
 
 ^ ■ 
 
 + 5 
 
 
 
 
 1 
 
 1 
 
 1 1 
 
 i I. 
 
 
 
 1 1 
 
 i 
 
 ( 
 
 
 -1 
 
 1 . ,. 
 
 J 
 
 i 
 
 
 \ 
 
 
 4 
 
 
 r^ 
 
 
 b 
 
 
 ? 
 
 
 8 
 
 
 9 
 
 Veloti!> rurvc nt i 1 itml.