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DEPARTMENT OF THE INTERIOR 
 CANADA 
 
 Hon. Arthur Mkiohen, Minialer \\ \\ Corv. C. M.(i . lJe,.u!y MiuUler 
 
 MS 4-5 
 
 PUBLICATIONS 
 
 Dominion Observatory 
 
 OTTAWA 
 
 Otto Klotz, ],L. D., D. Sc, Director 
 
 Vol. Ill, No. 1 1 
 
 Orbits of the 
 
 Spectroscopic Components 
 
 of Boss 2484 
 
 BT 
 
 U. I.. IIARPKR. M.A. 
 
 '.\<M> I 
 
 o rr A w A 
 
 COVKKNMKNT I'uiNTINC ItlUKAU 
 lOlS 
 
-I i 
 
 Li 
 
 .1 •»< 
 
 t;? 
 
 •15! 
 
 t:t, 
 
 C:' 
 
 
ORBITS OF THK SPKCTROSCOPIC COMPONENTS OF BOSS 2484 
 
 BY \V. K. HARPER, M.A. 
 
 This star i(» = fl'' 10"'-8. 5= +47'' 14') was annoiiiiced by Adams as a 
 si)('Ctros('()i)ic I'inary in the I'uhllnitiinis of the Astrdiioniicdl Society of the Pacific 
 in Dpconiber, 1914. Professor Adams kiiully (•omimiiiicatcd tlio velocities of their 
 tiv<' T)latcs shortly afn i- I undertook the imcstigation of its orliit. In rep'y 
 to my (inery as to the presence of the s])eetrum of the seeond component, 
 wiiieh in tiie meant inu iiad been recorded here, he slated that lioth rom])nnents 
 of the magnesium line X 44M had beeti ineasure(l on one plate, though with 
 considerable luicertainty in the case of the fainter component. The measures 
 ai)i)ear later on. 
 
 The star is of photographic matiiiitude .") S and of ty])e .•\2. While .^ome 
 of the i^arly plati>s show mmierous lines, })robably because in many of these the 
 comi)onent spectra were suiierjiosed, thereby increasing the contrast, yet in 
 nearly- all the later i)lates, upon which the orbit maiidy dei)ends, the hydrogen 
 lin(>s with tile magnesium \ 44S1 and ( alciiun \ 'A'XV.i are all that are available 
 for measurement. The orbit ))rvives to be (piite eccentric (( = -,")) and for about 
 115 da\'s of its Ki-day period the sjiectrM ari' too close to b(^ resoKcd with our 
 present e(|\iii>ni(Mif . Fortunately, the general form of the curve was obtained 
 from the first few re\ olutions, so that onl\' a limited numlicr of observations 
 have not beeii made use of. W'iiile the influeiic(~ of the .secondary s{)ectnun 
 iljjon the measure.-; of the main one seems to be nuich h^ss than might be 
 expected. \ ct it was felt that the oid>' plates that could be de])ended upon 
 were those w h( nin 'he coini)onents were comiiletely sei)aratcd or centrally 
 superjjosed. Tiie practice was thus ado])ted of observing the star only at the 
 times when tic lines were comi)letel>' resolved, .\dams' observations taken 
 in conjunction with our own gave a period of l.")!)S() days, a value so close to 
 the even da\ that observations at an>- one season on the three particular nights 
 would give only three poii\ts on the curve. ( 'onsefiuentiy. it was very 
 disajjpointing tiiat the desired nights in the jiutumn of l!tl.'). when different 
 
 .".Jl'.Hl— -> 
 
392 
 
 I'l lU.K A11(IN> 111 IIIK Ki'MIM'iN niOKHX \ H M! V 
 
 5:5 
 
 pimx's (■(luld have Ihtu nl»rrvc.l, wnv i,,v ilic iiKi^t part cliiudy. Thr >tai- i> 
 still availalilc at tiiiir ol wfitiiiu;, Inii it i> felt .hat dh-.Tvatimis now wdulil not 
 add aiiv -<|)('cial wriiilil m 'lir (Ictcrinilial iuii. 
 
 As the -pcctrai lim> iiavr l)"i'ii resolved (ivcr Midi a limited portion (,!' llic 
 ,„.l,it. it is hoped that when the laru'e rellector at \ictoria is ready for use, 
 additional oiiservatMins, usinjt fiivater .h.-per-ioii, will he secured 'and the orhit 
 determined with jiivater iirerision. I'or lhi> rea>on the pre-iit (htermination 
 is considend oniv a preliniinarv our ( »u _'S. (.ut of the total ol' 4',) plates 
 secured, the spectra are si'parated, and these 2> measures of tlie primary, 
 toiietlier with 2 plates where the >pectra must he nearly supcrixiscd. are used 
 in the determination. The spectrum of the secondary componont is so j.oorly 
 dpfhied that only hi measures of it hav,' Ix'en aecept.Ml as at all trustworthy. 
 In some cases only a sinjile line is u>ed. These lA measures, duly weinlite,!. 
 have been coiiihined with the i'.ll .just mentioned in the solution. .Ml the 
 plates have been made on Seed 27 einulHon with spectroy:rai)h T whose 
 dispersion is :52H .\ per millime're at the minimum deviation. \ 4:?2."). 
 
 The hillowinti table jii\es the wave-len^';ths which were used I'or the lines 
 meastired. They were a-lojited from ;i -tar of similar tyjie. 14 .\iirio;a\ and 
 have not been revised for thi> star. The number of times measured on 2S 
 plato.s with the residuals for each line from the mean of th«- plate is also shown. 
 Aftor this table the d(>tailed measure> of the plates are given. 
 
 lAlll.l. e'l W.'iVl. i.i.m;iiis 
 
 q;;. 
 
 
 4. "J 
 
 1011 
 
 I.i4^> 
 
 7i:i 
 
 I4K1 
 
 477 
 
 111.". 
 
 .■tl."i 
 
 44(14 
 
 KlU 
 
 Ctlil 
 
 ri4."i 
 
 V.V2:> 
 
 li'.IH 
 
 «:«)- 
 
 '.171 
 
 4'.'7I 
 
 (;7."i 
 
 IJlHl 
 
 .');'.7 
 
 
 M.:tl. 
 
 Mriui 
 
 
 
 
 Moin 
 
 Moun 
 
 ^^ 
 
 
 .\l(r<'l)rair 
 
 li 
 
 \ 
 
 n 
 
 N'linu'rical 
 
 .\lt!i4>r:ur 
 
 
 K.-i.lu:il 
 
 l!r-i.l»nl 
 
 
 
 Kcxiiliiul 
 
 Ursuliuil 
 
 1 
 
 
 + 10 :) 
 
 
 42W0(Ht 
 
 
 .■,.<> 
 
 + .-,-3 
 
 s 
 
 III t 
 
 - 1 <) 
 
 
 42.33 425 
 
 11 
 
 i:i r. 
 
 + 4 4 
 
 1 
 
 77 
 
 - II :i 
 
 ■ :'. :i 
 
 
 4202 :«ill 
 411:! s:)!i 
 
 1 
 3 
 
 l.">-7 
 
 - .")1 
 
 
 1.-, .V 
 
 '12 
 
 
 4101 S'lM 
 
 (1 
 
 l)-7 
 
 - .5 '1 
 
 11 
 
 ',1 J 
 
 - II 1 
 
 
 1077 .S(12 
 
 1 
 
 
 ;■ 2-3 
 
 
 <l ,"i 
 
 II II 
 
 
 1071 HIM 
 
 7 
 
 1-8 
 
 - 14 
 
 
 l.'i :i 
 
 , !i :i 
 
 
 t(H>;{ 7:!0 
 
 3 
 
 2 9 
 
 + 2 
 
 \', 
 
 y 7 
 
 ■J li 
 
 
 404.-) (HO 
 
 8 
 
 10 7 
 
 + 4-1 
 
 1 
 
 
 I'l 
 
 t 
 
 3<i:t3 82.i 
 
 14 
 
 n-9 
 
 1 
 
 - 3S 
 
OHBirs OK IHK Sl'K(Tli(J.s(()l'lC COMl'ONENTS OK BOSS 24.S4 
 
 ;{«J3 
 
 MKAsriU-.S n|' BOSS JIM ipriiiKii 
 
 
 t>7'.MI 
 
 t isi H ) 
 
 hSO'.t 
 
 iwiii 
 
 Ii.s23 
 
 r,.s30 
 
 l^VfK 
 
 \ 
 
 
 
 
 
 
 
 
 
 \.l, Ut 
 
 \ .-1 W't 
 
 \'l. \Vl 
 
 \rl. 
 
 \\! 
 
 \.[, 
 
 \\l 
 
 \r\. 
 
 \\l 
 
 \.'l 
 
 Wi. 
 
 4.VH) 
 
 + £i 2 
 
 
 1 . 
 
 i 
 ■ ■ 
 
 
 
 + 720 
 
 , 
 
 + 2i\ \ 
 
 
 
 41H1 
 
 + an 
 
 i 
 
 -ir,.o i 
 
 - 5-2i 1 
 
 -34 2 
 
 1 
 
 <»2-7 
 
 1 
 
 7-0i ', 
 
 + 23 1 
 
 1 
 
 4:i40 
 
 i-13-4 
 
 5 
 
 + 15 J 
 
 -23-5, S 
 
 
 sti-2 
 
 1 
 
 12 Si i 
 
 30 -h 
 
 1 
 
 CfJ-) 
 
 r t) >» i; 
 
 7 a S 
 
 
 -2S.,li i 
 
 'M-f<\ i 
 
 3M^(i i 
 
 
 
 4271 
 
 
 
 423:i 
 
 
 
 1-8 
 
 1, 
 
 4143 
 
 +23 -H, } 
 
 ■ ■ ■ • ■ 1 
 
 
 
 
 
 
 
 
 4101 
 
 -22 0; 1 
 
 
 
 + 17-2 i 
 
 
 10^1 7 i 
 
 
 
 2-8 
 
 1 
 
 4077 
 
 
 
 
 
 
 
 
 31-4i 
 
 1 
 
 
 
 4071 
 
 + 4-7 
 
 i 
 
 
 
 
 
 
 
 1 
 
 
 
 
 40«:i 
 
 -271 i 
 
 . 
 
 
 
 
 
 1 
 
 
 11 
 
 3 
 
 4(Mr. 
 
 - 2 >i ', 
 
 -10-7 
 
 i 
 
 
 
 
 04 (1 i 
 
 1 
 
 
 
 
 4005 
 
 + 8-7 
 
 i 
 
 
 
 4-1-5 } 
 
 
 
 
 
 , , i . 
 
 104 
 
 . 
 
 .■i9:i3 
 
 
 
 -10-3 
 
 i 
 
 - 7ti } 
 
 -'1 
 
 I 
 
 + 1047 
 
 1 
 
 + 23-4 i 
 
 r ft- 4 
 
 • 
 
 WllKllKll 
 
 
 
 
 
 
 
 
 nican 
 
 - I 40 
 
 - s ;mi 
 
 - .'ttW, 
 
 -27 ■33 
 
 ■ 04 IJ5 
 
 -20 Ml 
 
 -T 10 
 
 \a 
 
 - '.Ml."i 
 
 -10 :i'.t 
 
 10 S3 
 
 11 71 
 
 1 1 70 
 
 - 15 4C, 
 
 -15 ■SI 
 
 \d 
 
 ■1)3 
 
 (!.■> 
 
 - 01 
 
 - 05 
 
 15 
 
 - 10 
 
 - OS 
 
 ( urv 
 
 - -'N 
 
 • 2.S 
 
 ■ JX 
 
 - ■2S 
 
 - ■ 2.S 
 
 - -28 
 
 - -28 
 
 T!ri(ii;,l 
 
 
 
 
 
 
 
 
 Vcl<K'ltV 
 
 .'i '1 
 
 I'l 1 
 
 h. s 
 
 - 3!) 3 
 
 ! 7n 
 
 i- 5 II 
 
 - 7 1 
 
 o2lO'J- 
 
"5 
 •I I** 
 
 
 394 
 
 I'l Bl 
 
 IIATIDNS Ot Mil-; DdMIMON nH^Kl(\ A H PU^ 
 
 MKA^l l!i:s <il' Hi ISS Jlsl iiinT[iiTyi 
 
 ' i'nuliiiiu'l 
 
 IIM 
 till I 
 Ci.M 
 
 t:in 
 i:i2:, 
 i:iii7 
 
 IJ'U 
 tJ7 I 
 
 V2:i.\ 
 
 t-"J7 
 V.'OJ 
 ll'.is 
 
 llllt 
 
 1077 
 41171 
 tOl'p.i 
 .104.-, 
 
 V,l \\t 
 
 ■Jll I. ', 
 
 II.S.V.' I IJ.Mll 
 
 \ I Wi 
 
 \,1 \Vl 
 
 V,l \\t \.l \v 
 
 >iitll 
 
 cl 
 
 11 
 
 p;iit 
 
 
 \» 
 
 
 Vi 
 
 ( 
 
 iirv 
 
 
 -l.Vl i 
 
 'I 111 
 li-. s.; 
 
 ■JO '.I ; 
 1^ 1 1 
 
 Jl i"i 
 17 :.l 
 
 IV.' 
 
 11 :* 
 
 :i2 D' i 
 
 - 5-3 1 
 
 + U 
 - 2 
 
 111 I ' 
 
 -l.> I 
 
 \ f 1 \Vt 
 
 0-1 ; 
 
 ■f 4-5| I 
 + 4-31 i 
 
 ,Vll 1 
 
 7 :.ii 
 is si 
 
 I! 
 
 ■js 
 
 11 II I 
 s ■_' 1 
 
 'I 1 ; 
 
 s :; ; 
 
 Jll 1 ;■ 
 
 -M .". 1 
 
 1 't 1 
 
 II 7 1 
 
 :..'i 1 
 
 III ; 
 I, 1 1 
 
 IJ II s 
 
 + 2') -4! 1 
 
 I III 
 
 I'l in 
 
 III! 
 
 IS 
 
 -HllHO 
 
 - in :«i 
 111'. 
 
 S-4 
 
 \,l \\i 
 
 N'.t 1 ; 
 
 S71 s 
 
 7S-3J ; 
 
 +02 0' i; 
 
 r i'-7i ; 
 
 ^•2:i.7l I 
 
 -12 Si ■ 
 
 - - >; i 
 
 - 5-H 
 -11-8 
 
 -20 2.'. 
 - Ill 
 
 +65' 5 
 
 + 2H-9 i 
 
 + 10 :!(! 
 
 -20 .".! 
 
 Oii 
 
 - - ■ 2H 
 
 -10 6 
 
 a. 
 
UKBIT.S OK THE .S1'K( ritUSCOI'Ir fOMrUNENTS UK BUSS 24S4 
 
 390 
 
 MEASURES OI' liOSS .'».st |,.-mi:ir .l.rvwl 
 
 \ 
 
 US' 17 
 
 O'.KKl 
 
 •I'HI- 
 
 
 ooi.-, 
 
 1.021 
 
 0032 
 
 0031 
 
 
 \il Wi 
 
 V,l, \V| 
 
 i 
 -• — i ' -^ 
 
 \,l 
 
 Ul 
 
 V.l 
 
 \\i 
 
 1 
 
 \.-l \\i 
 
 \VI, 
 
 \\t. 
 
 4.-.7J 
 
 • '.1 I 
 
 
 
 
 
 
 
 
 
 
 
 + S().l 
 
 3 
 J 
 
 i 
 1 
 
 J 
 
 4.')4<i 
 
 ( 
 
 i 
 
 
 
 
 r S'S 
 
 1 
 
 r 2-4 
 
 1 
 
 
 
 04-4 
 
 4481 
 
 ^ !i :) 
 
 1 
 
 . 107 ;i '. 
 
 ■ 2.t '.) 
 
 I 
 
 -21-2 
 
 1 
 
 t j..- 
 
 1 
 
 . (ti 1 
 
 L 
 
 02-9 
 
 441,1 
 
 
 
 
 
 
 
 
 
 
 
 
 4340 
 
 
 
 127 J ; 
 
 10 
 
 1 
 
 + 5-9 5 
 
 - 7-5 
 
 1, 
 
 
 
 04 ■« 
 
 4:!2-, 
 
 -14 2 
 
 1 
 
 
 
 
 i 
 
 
 
 
 
 
 4H(I7 
 
 ■ 2:1 :i 
 
 1 
 
 
 
 
 
 
 - 1-3 
 
 
 
 
 
 
 427 1 
 
 
 
 
 
 
 
 
 + 28-1 
 
 S, 
 
 
 
 
 
 42:tll 
 
 
 
 n.')(i ; 
 
 
 
 - 1 ,i 
 . 10 1 
 
 I 
 
 
 
 
 
 
 
 42.'!:! 
 
 
 
 
 1U3-6 
 
 J 
 
 414,', 
 
 
 
 '.t7 .") J 
 
 
 
 
 
 + 2-2 
 
 1 
 
 
 
 
 
 4101 
 
 
 
 
 
 1071 
 
 
 
 
 
 S8-8 
 
 1 
 
 10.;:; 
 
 • .".1 
 
 ', 
 
 
 
 
 
 
 
 
 
 
 
 ^ 
 
 404:1 
 
 
 
 so 7 ; 
 
 
 
 -:;i, 1 
 
 < 
 
 + 0-4 i 
 
 
 
 + 1100 
 
 ; 
 
 :i!i:!:; 
 
 -2'.l 1 
 
 * 
 
 ^o'.i.2: ; 
 
 + 20 ■ 7 
 
 
 
 
 
 
 + 56-9i ; 
 
 
 
 Wrigl.t,.,] 
 
 
 
 
 
 
 
 
 
 lllrrm 
 
 t- .". 00 
 
 + 100 01 
 
 -2s r,7 
 
 - 3 07 
 
 -I- 2 03 
 
 -r52-,i7 
 
 4- 90-3(1 
 
 \« 
 
 -2;iint 
 
 - 2:i SI 
 
 -23 OS 
 
 -2.V00 
 
 -2,i 13 
 
 -25 -40 
 
 -2") -02 
 
 W 
 
 02 
 
 + o;i 
 
 04 
 
 - l.-i 
 
 - 12 
 
 - 10 
 
 - 15 
 
 < nr\- 
 
 - 2s 
 
 •2S 
 
 - ■2S 
 
 - 2H 
 
 — 2s 
 
 - -28 
 
 - -28 
 
 liM.lial 
 
 
 
 
 
 
 
 
 Vrlunly 
 
 ~1S 1 
 
 f- 7i> V, 
 
 ► 1 4 
 
 -20- 1 
 
 -22-11 
 
 -f-2() 7 
 
 + 04 3 
 
:w() 
 
 IT 
 
 rHI I(\l loss (IF IIIF, DoMINIuV I )HSKKVAT()KY 
 
 1:1. 
 
 MEASURES OF B088 2484 (primary)— ConiiniKid 
 
 d 
 
 c;:. 
 
OHBITo OF lllK hl'E( TKU.S( Dl'K ( OMl'U.NKN Trt OF BOSS 2484 
 
 397 
 
 i.",t'.i 
 
 l.tii? 
 l.'Tl 
 l.':!G 
 l.'ii.i 
 nils 
 
 iiii>:i 
 4oi:, 
 aii.i.i 
 
 lIltMlJ 
 \a 
 \i 
 
 ( iirv. 
 
 VdiicUv 
 
 .ME.\;5L'lli;.S U¥ lii)6i J4h4 (primary;— Co(i/i«i«!<i 
 
 Vel. I Wi 
 
 ;(-• I, 
 
 .'kSd' 
 
 V,l, Ui 
 
 7:i I 
 
 III 
 I'l 
 
 74(l,s 
 
 \.l \\i 
 
 + 10-4) ; 
 
 + i-s 1 
 
 \.i \\i 
 
 j:, II. 
 1 1 
 
 r.^l 
 
 ■J3y t 
 1 •>■<>! ; 
 
 -'2 -2 1 
 ■Jl-:!' ; 
 
 74(>S 
 
 \\l. \\t 
 
 + 8()-4 
 
 05 :i 
 
 V.I. , Ui 
 
 48 tl 
 
 .Wl 
 
 .'.'I IJ 
 
 1 1 yi 
 
 07 
 
 rii 
 
 "Mill 
 
 + !l2-2i 
 
 71Kli 
 
 \'.l. 
 
 -MtS ti 
 
 2S0 
 •.'I-8 
 
 + 40 ". 
 
 vs l.i 
 
 , .) 
 
 . s7 
 
 II VI 
 
 , , 
 
 .40 
 
 ii:i 
 
 -t- 
 
 i;{ 
 
 Js 
 
 
 -V 
 
 +111 -2 
 
:<9N 
 
 IMBLKW: li>\ . .K I UK DoMIMHN ( )HSKHV il't )UV 
 
 •IS* 
 
 '4 
 
 MEASURES OK BOSS 2484 (ptimiay)— Continued 
 
 
 
 
 t.'ii'.i 
 
 IIM 
 
 4:i-lii 
 i:i()7 
 4'2(e 
 
 4071 
 4045 
 
 7I.S7 
 
 \\i 
 
 \ J 
 
 Radial 
 
 V*-It>ftl \ 
 
 + 41 ll } 
 
 +:!i-4! i 
 
 V, ', \Vi 
 
 +H2-' 
 ♦ :t:i 1 
 
 - l.i I 
 
 \;\ ■ \vt 
 
 + 14-7 5 
 
 :n 4l J 
 
 + 'J0 4 1 
 
 in 
 
 "ll .' 
 
 IS 
 
 V,l. ' \\i 
 
 III II ; 
 
 t:il '.I ! 
 
 ;."i:i7 
 
 \'('l \Vt 
 
 ;i(i Ml 
 
 lo J',1 
 
 n 
 
 7."i:n 
 
 V.l. \Vt 
 
 Vi-1. 
 
 Wt 
 
 "•I tn 
 
 1.". J't 
 
 ii:; 
 
 + Ili:Mi i 
 
 lii:i III 
 
 i:, liii 
 
 l.t 
 
 - 90 J 
 
 '.I 00 
 
 IS 4.' 
 
 II 
 
 is 
 
 -27S 
 
ORBIIS OF THE SI>E( rUdSCOPIC (((MP" )NF..\TS OK BOSS 24S4 
 
 399 
 
 MEASURES OF BOSS 2484 (primary)— <'<mhnu«i 
 
 X 
 
 7'i')7 
 
 7."i.')'.t 
 
 7.V1II 
 
 7.VHI 
 
 7tiOO 
 
 7l'i()J 
 
 7Ciii:t 
 
 
 Vel. 
 
 \Vl 
 
 Vol. \Vt 
 
 Vcl. 1 \Vt 
 
 • iiKi 1! ; 
 
 V.I. 
 
 T :i7 4 
 
 Wl 
 
 Vim 
 
 Wl 
 
 Vrl Wl 
 
 Vi.l 1 Wt. 
 
 44SI 
 
 + nsti 
 
 I 
 1 
 
 . 1 1 .'. 7 ; 
 
 J 
 
 
 
 4- 7H-()i ! 
 
 
 
 44114 
 
 
 Km 4 
 
 
 
 
 
 
 
 
 4:i4ii 
 
 IJ.'i 1. ': 
 
 '-^ 1 
 
 .•<7-2l J 
 
 .59 -8 
 
 ; 
 
 
 
 71 i; I 
 
 t (.4 2 J 
 
 4:t2.-i 
 
 
 
 
 :!4',t 
 
 >, 
 
 ' ('.7 (1 
 
 ■ 
 
 70 4 1 
 
 
 4:iii7 
 
 
 
 
 
 
 .•,0 7 
 
 1 
 
 
 
 4271 
 
 
 
 
 .-,1 (1 
 
 3 
 
 
 
 
 (14 kI 1 
 
 42:tf. 
 
 1117 :i ' 
 
 
 7(1 4 i 
 
 
 
 
 
 
 
 42:i:) 
 
 
 
 
 
 
 
 
 
 r,2 » 
 
 1 
 
 4 1 l.i 
 
 
 
 
 
 
 
 
 M ( 1 1. 
 
 
 
 lini 
 
 
 
 ii.i 4 ; 
 
 
 
 
 
 
 so -5 
 
 ^ 
 
 4(177 
 
 
 III! 1 , 
 
 
 
 
 
 
 
 
 4(171 
 
 
 1 111 .". ; 
 
 
 .■.1 1" 
 
 ; 
 
 
 
 IV.i l\ 
 
 73-2 J 
 
 4(H.:i 
 
 
 
 
 
 
 (i!t 1 
 
 1 
 
 
 M-o\ { 
 
 4(l4.'i 
 
 1 1 .'. .". ; 
 
 
 "1 1 ; 
 
 47 :. 
 
 '. 
 
 ' s2 J 
 
 1, 
 
 
 Mt 7 ' 
 
 :!'.i:i;i 
 
 • ',i."i J 
 
 
 . 1(17 -' ;, 
 
 • 117 (1 ; 
 
 • 74 S 
 
 ' 
 
 
 
 ' ii7 ..' '. 
 
 • "'' •"' i 
 
 \\i,i>;M.'.l 
 
 
 
 
 
 
 
 nii'iui 
 
 • Ins s) 
 
 • KCi 7,! 
 
 +',«• .!:> 
 
 • !'.( Ill 
 
 ■ 70 .'u 
 
 • 7 1 sj 
 
 • 7.1 M 
 
 \. 
 
 Jfl 7(1 
 
 _'( 1 7i 1 
 
 Jll 7ii 
 
 -2:i ii4 
 
 2,i ■•) 
 
 J 1 -'1 . 
 
 ■Jl 2(1 
 
 \j 
 
 II. > 
 
 1 1 
 
 IS 
 
 o:i 
 
 Ij 
 
 0*1 
 
 I,". 
 
 Clin 
 
 _'s 
 
 J\ 
 
 - 2N 
 
 - -28 
 
 — Js 
 
 
 
 - 28 
 
 Uiuli:,! 
 
 
 
 
 
 
 Vllo.it y 
 
 t .^7 
 
 1 
 
 • ^.'l ii 
 
 + 78-2 
 
 
 ■ 1 
 
 ! I'l 
 
 ' 1 
 
 • i: J 
 
 f4S 
 
 ' 
 

 "I- 
 
 •IS* 
 
 40(1 
 
 IHBUCAilONS UK THK UUMINK'N OBSKUVAToUV 
 
 M1'.A>1 UliS III- HI ISS 'J4M ispidmliiry I — '■'"i'iii"»' 
 
 l.'il'i 
 
 t;>tii 
 i:iii7 
 4J71 
 1J."*I 
 IIDI 
 tlil.'i 
 
 tiHL':i 
 
 Vfl. \\t 
 
 ;'i:!.; 
 
 Wi-igliti-.! 
 ini'uii 
 
 Ciirv 
 
 Itailiitl 
 
 Vi'liii'ilv 
 
 \ .1 W I 
 
 111. :i.' 
 
 I I 7i. 
 
 1:1 
 
 l:(l 
 
 7 His 
 
 \.l \\i 
 
 ml III 
 
 _■:. li. 
 
 I I 
 
 Kts r. 
 
 \ .1 w 1 
 
 i;i."i 
 I II 
 
 \.i, \\i 
 
 ^l I. 
 
 I III 
 1 1 
 
 \ . I \M 
 
 7.">:i."i 
 
 \(l \Vi 
 
 si 1.11 
 
 .■| 4ii 
 
 1:1 
 
 -Vi ;i ; 
 
 ,'.ll 
 HI 
 
 - 1.11 ml 
 - l.VJ'l 
 
 11 
 
 - M- 
 
(•KBITS OK rnK spEnuoscoi'ic; ( omi'uneni jf boss 2484 401 
 
 MKASl KKS (IF UOSS .>lf»4 (wi-ondiiry; -Cuitctuiled 
 
 A 
 
 T.VJS 
 
 7. ">.'»" 
 
 7."),"'.t 
 
 7.")tj() 
 
 7M)2 
 
 7tio;i 
 
 
 
 \.l 
 
 Wt 
 
 V.l. \Vi 
 
 V,l Wi. 
 
 j 
 
 Vil. 
 
 Wt 
 
 V,L 
 
 Wt 
 
 \il. \Vi 
 
 Vel. 
 
 \Vl. 
 
 44M 
 
 - lilt s ; 
 
 77 s i 
 
 - lot s 
 
 
 - 78-3 
 
 J 
 
 
 
 
 
 
 
 
 44111 
 
 
 
 77 '1 
 
 1 
 
 
 
 
 
 
 
 4271 
 
 
 
 1110 
 
 J 
 
 
 
 
 
 
 
 42;t;i 
 
 
 li.'p .'i; ; 
 
 1 to I) 
 
 1 
 
 
 
 
 
 
 
 414;i 
 
 
 112 .v: J 
 
 
 
 
 
 
 
 
 
 4101 
 
 
 
 
 
 HIS 7 i 
 
 
 
 
 
 
 4()4:) 
 
 
 
 1(15 -6 i 
 
 
 
 
 -.■>()!» 
 -7)0 1 
 
 
 
 
 ;!<«:} 
 
 
 
 -119-2 i 
 
 - ,S!) 4 
 
 4 
 
 -1U0| i 
 
 1 
 
 -.■)2-7i| i 
 
 i 
 
 « 
 I 
 
 4 
 
 
 
 
 
 
 
 W'eighltHl 
 
 
 
 
 
 
 
 
 Dlt'llM 
 
 !lll S(| 
 
 !W ',i:i 
 
 - Iilii 20 
 
 - Wi M 
 
 - 7iS 40 
 
 - 7i7i IHI 
 
 
 \. 
 
 1.-, 1.1, 
 
 .'(1 7il 
 
 20 70 
 
 20 70 
 
 - 24 ■20 
 
 - 21 20 
 
 
 Vi 
 
 \:i 
 
 ^ O.'i 
 
 11 
 
 ■IS 
 
 (Ki 
 
 17. 
 
 
 ( urv. 
 
 2n 
 
 2s 
 
 - 2s 
 
 ■2s 
 
 ■■2H 
 
 ■ 2s 
 
 
 Ua.hal 
 
 
 
 
 
 
 
 
 Vilocjly 
 
 — 121 • 
 
 -120- -124- 1 
 
 -120- 
 
 - 83- 
 
 - 80- 
 
 
 
 
 1 
 
 
 
 _J 
 
 
 1 
 
 
 1 
 
 
 1 
 
 
402 
 
 I'tUl.U AlIONS (IK Tin: DnMISKiN ( iHSKl{\ ATOUV 
 
 ^iMMAin 111' nrr\\\ \ MKAsriii,.-- <ir H(iss ■Jl^l 
 
 o 
 
 •is: 
 
 
 Plate I observer* 
 
 l).ilf 
 
 6790 
 t>800 
 6809 
 6816 
 6823 
 i;s:iii 
 i).s:ts 
 CMI, 
 
 iisr.i 
 
 t.: 
 
 711 
 
 1>S,(> 
 IISM 
 t>(*'i7 
 tt9tKI 
 6902 
 691.5 
 6921 
 U932 
 6934 
 6965 
 6986 
 7325 
 7333 
 7;t37 
 7;«N 
 7367 
 7t(W 
 Tiiil 
 
 :iu-> 
 
 7461 
 
 7468 
 7469 
 
 7486 
 7487 
 7S00 
 7334 
 7535 
 73:17 
 7538 
 7.544 
 7.557 
 7559 
 7.560 
 7599 
 "OOO 
 7602 
 7603 
 
 il 
 
 H-Y 
 
 (' 
 
 ^ 
 II 
 
 II I 
 II 
 
 ^ 
 r 
 "I 
 II 
 II 
 
 II 
 
 V 
 H 
 
 ^ 
 )■ 
 i: 
 (; 
 H 
 V 
 II 
 
 II 
 11 
 
 M 
 
 H 
 
 ^ 
 II 
 
 V II 
 
 a 
 
 Y-II 
 H 
 
 II 
 
 H-V 
 
 11 
 I' 
 
 Y 
 H 
 II 
 II 
 H 
 II 
 H 
 
 I'll" 
 I'll, 17 
 
 i " '^ 
 
 ,. _,| 
 
 M .r 1 
 
 ■• 1 ! 
 
 ■■ I 1 
 
 ■■ 1". 
 
 is 
 
 |.i 
 
 ■' :!ii 
 \|)ril :i 
 
 |:i 
 17 
 ,,, 
 
 M;iy :. 
 
 ■■ i;i 
 
 !(Vt, '.I 
 
 ■■ 111 
 
 ■■ II 
 I J 
 
 ** 'tt 
 
 Ai.v IJ 
 
 ■ :i(i 
 
 ntlii 
 
 Jan. II 
 
 •• 1 1 
 
 Feb 1 
 
 Miir. J 
 
 ;) 
 
 •• II 
 
 I'.t 
 
 " lit. 
 
 • I!t 
 
 April :i 
 
 ■Illllali 
 
 Date 
 
 ' 2,420,000 + 
 
 I'HIMAHV 
 
 I'hii 
 
 .")lii liii-J 
 
 .547 730 
 
 -.48 710 
 
 .■).■>(( 723 
 
 .■.58 776 
 
 .".till 7J1 
 
 .".l.l l,'M, 
 
 :rM m2 
 
 .■)(>•) ti.51 
 .•.70-730 
 .■.71li.5li 
 .i72 656 
 .■>7.5-635 
 .".76 -6.53 
 .587-591 
 .i'.M 5:J6 
 .■.112-583 
 (ilH)-678 
 
 r.()l-tv.'7 
 
 tiO.". 1.74 
 
 I it 17 liii<i 
 
 tij;) ii7J 
 
 (i;ii ."i7,i 
 
 7MI 927 
 7M Hil-J 
 7vJ '.I-J7 
 7>:i '1J7 
 
 Nil 
 
 si I 
 
 'M.". 
 sl'l 
 
 sirj 
 
 (•26 
 '.•34 
 
 ii.50 
 
 .T<1<» 
 
 .570 
 liS\ i 
 .570 
 VIi. 
 '.142 MA 
 '.142 WU 
 .M2 764 
 9.57 .581 
 •.1.57 «W 
 9.50-625 
 9.59 094 
 
 f<3 
 70 
 08 
 t>9 
 74 
 09 
 68 
 67 
 03 
 71 
 64 
 
 63 
 65 
 .59 
 .54 
 
 S'.t 
 69 
 64 
 
 lix 
 
 IkS 
 
 71 
 
 til 
 (hi 
 02 
 1(1 
 III 
 11 
 IHi 
 IJ 
 
 Vel. 
 
 Wt. 
 
 - 5 
 -19 
 -16 
 
 -39 
 
 fix 
 
 -2(i- 
 -41 
 
 -2ii 
 -Is 
 
 - S 
 -1-65 
 -10 
 -18- 
 -1-76 
 -I- 4 
 -2\> 
 _-.-. 
 
 -r2(i 
 + 04 
 -1-39 
 
 - 9 
 
 14 '.12 I 
 14 'J7 
 0-',»2 , 
 14X0 1 
 
 14 86 j 
 U 97 I 
 1.5 XO 
 
 .S 02 
 
 15 87 
 01 
 0-08 
 
 14 90 
 14 98 
 
 96 
 
 1 03 i 
 
 9 . .. 
 4 ' 
 
 8 ! 
 3 
 
 9 1 
 I) 
 
 1 I 
 3 
 
 -1- .5 1 - s 
 
 -r75-3 
 
 -*-42-X 
 - .".1 t 
 
 r 77 1 
 1 -1-80 
 
 + 33 1 
 
 - 1. s 
 
 -71 
 +99- 
 
 +31 2 
 + 43- 1 
 
 + 51 -2 
 ^10 9 
 + 21 4 
 
 + 38->« 
 + 87 
 -27 
 + 87 
 + 85 
 ■1-78 
 + 25-4 
 + 45 9 
 + 47-2 
 + 48 1 
 
 + 87-3 
 
 -27-8 
 
 + 87-9 
 
 + 85-6 
 
 + 78-2 
 
 o-c 
 
 Vel. 
 
 + 2-3 
 + 10 
 
 + 1-7 
 + 0-5 
 
 3 ' + 8-8 
 
 + 3-7 
 
 -I- 20 I 
 
 ' 
 
 -HI. 2 
 
 14 
 
 - 6-7 
 
 16 
 
 - 0-2 
 
 1 
 
 1 li II 
 
 :i 
 
 - 4 (1 
 
 2 6 
 
 - 2 
 
 1 
 
 - 6-9 
 
 -10-9 
 + 17-7 
 
 - 3-8 
 + 4 1 
 
 - 0-8 
 -171 
 -11-2 
 
 - 02 
 + 7-3 
 
 7 9 
 
 3 6 
 38 
 76 
 6 9 
 
 4 4 
 7 
 
 -131 
 
 Wt. O-C 
 
 79 
 
 -116 
 -129 
 
 81 
 
 -121 
 
 5 
 
 5 
 5 
 
 0.5 
 
 120 
 124 
 -120 I 
 
 83 
 80 
 
 -14 
 
 + 3 
 
 + 8 
 - S 
 
 - 7 
 
 -18 
 
 -15 
 ±0 
 
 + 1 
 ± 
 - 4 
 
 -\ 4 
 
 •C-Cannnn H H:ir|>(-i. P Plaskctt.Y Young 
 
OHHITS OK THE .SPEC TUUSroi'iC COMPONENTS OF BOSS 2484 
 
 403 
 
 Mor.Nr WILSON ORSKRVATIONS 
 
 Dste 
 
 lull:. II D'ltr I'll. 
 
 1912. .I;ltl 2.S 
 .\pril 2S 
 M:iv 2S 
 
 Dvr L'N 
 
 l!)i:i, Miir r. 
 
 I'HIMAHV .-^ECONDA-l 
 
 Vol. O-C 
 
 .4i!>.4iny7n 
 
 2 <).■) 
 
 -K! 7 
 
 .".21 Tl'i 
 
 1 S2 
 
 r 1- 
 
 .i.il 1)74 
 
 1." 7ti 
 
 + 76- 
 
 ■lir.-ori I 
 
 i; l',< 
 
 -22-8 
 
 W52-74S 
 
 l.Mll 
 
 - 9-4 
 
 Vel. 
 
 -151 
 
 The ;5() incasuros of tin- ])riMiiirv. previously rcfcrre,! to a.s luo.st trustworthy, 
 were jrrouiH'd arcordiiifr to pha.sr into ,S uorinai i)lacfs and the i:} moasurcs of 
 the .sccoiHlary into l] otlirrs. Thc'^o were romhinwl into one Icast-squaros 
 solution as indicated in the l',il,lirati<ins of thr Dominion Ohsmofory. \o\. I, 
 paKe .S27. 
 
 NOHMAI. I'LAIl-.S 
 
 + 23-2 
 
 •fi 
 
 + 45 1 
 
 •7 
 
 + 81-2 
 
 14 
 
 + 800 
 
 It 
 
 •r 68 r, 
 
 10 
 
 + 45 2 
 
 9 
 
 - 7 1 
 
 .■i 
 
 - 84 
 
 ..s 
 
 - 79 
 
 1 
 
 - Ml 7 
 
 
 Prpliminiirv l-'iiinl 
 
 14 S3 
 
 14 ,^4 
 
 - 6« 
 
 - 70 
 
 HOT 
 
 1.') 00 
 
 + 7 3 
 
 + 5-8 
 
 1587 
 
 1 .•> S8 
 
 + 16 
 
 + 8 
 
 07 
 
 ■OS 
 
 - 1 r. 
 
 - 2 
 
 111 
 
 fi2 
 
 + 2 
 
 t in 
 
 ■9H 
 
 119 
 
 - 3 2 
 
 - 3 1 
 
 2 fl7 
 
 2 ns 
 
 + 0-5 
 
 -h 10 
 
 1.1 lit 
 
 i.t f..=i 
 
 -t- 1-5 
 
 • 1 7 
 
 ri '.HI 
 
 11 91 
 
 -12-5 
 
 - Ill ti 
 
 I.-, '.i.i 
 
 1.". 94 
 
 . 1 2 
 
 + 1 
 
 (IS 
 
 99 
 
 1 
 
 ' 1 1 
 
 f 38 
 
 The follouini; were chosen as prejiiniiiary elements. 
 
 /' = l.VOSt; days 
 
 f = ol 
 
 w = 3.-)-)° 
 
 A" = 62 km. 
 
 Kx = 7") km. 
 
 7 =12 km. 
 
 T = J.l). 2,41i).4()S 1)4 
 
404 
 
 PIBLK ATIUNS OK THE DOMINION OBSEH\AT()in 
 
 i; ,. 
 
 "1 
 
 The iicriod was considorcd fixed from a comijarison of Mount \Ml.soi'. 
 oliscrvationss with our own and cliscrvation ('(luations were built up 
 connecting tlic residuals with ihi n niainini^ -i\ ch'incnts. Making the 
 transformations. 
 
 .r = 67 
 
 // = 5/\ 
 
 - = A' 1 
 
 (/ = 10(1, 6< 
 
 r = lOO.oo) 
 
 -r = [l-7!)()7:)lo7' 
 
 0: 
 'IS' 
 US' 
 
 The observation and resulting normal iMiuations are as follows; 
 
 iiliSI.US AIION IX^l AlloNS 
 
 s 
 'I 
 
 10 
 
 II 
 
 Weight 
 
 <i 
 
 1 (KXI 
 
 7 
 
 1 (KMI 
 
 1 1 
 
 1 (KHI 1 
 
 11 
 
 1 (HK) 
 
 10 
 
 1 (KX) 
 
 ■9 
 
 1000 
 
 3 
 
 lOOO 
 
 ■8 
 
 1000 
 
 1 
 
 1000 
 
 4 
 
 1 (XM) 
 
 2 
 
 1 (K)0 
 
 ,- sm 
 
 ^1 177 
 
 + i:)0,s 
 
 + 1 2117 
 
 f 974 
 
 + 071 ! 
 
 + 034 
 
 t 
 
 H 
 
 
 
 IC 
 
 — n 
 
 
 - -704 
 
 4- 
 
 ■039 
 
 
 ■77s 
 
 4- 6 = 
 
 
 ~ (CH 
 
 *- 
 
 li 1 9 
 
 - 
 
 S43 
 
 - 73 
 
 
 t -912 
 
 4 
 
 IM) 
 
 - 
 
 3tti 
 
 - 1 ti 
 
 
 ^ 1194 
 
 4- 
 
 (120 
 
 4- 
 
 017 
 
 4- 15 
 
 
 + -078 
 
 - 
 
 ■37li 
 
 + 
 
 ■742 
 
 - 2 
 
 
 •.i04 
 
 - 
 
 •521 
 
 + 
 
 •7H7 
 
 4- 3 2 
 
 
 - 128 
 
 - 
 
 ■.-.31 
 
 + 
 
 • :i04 
 
 - 5 
 
 
 - -222 
 
 + 
 
 •.")73 
 
 - 
 
 •34S 
 
 - 15 
 
 - ^w 
 
 + 1 03.'i 
 
 _ 
 
 7r>.-. 
 
 + 
 
 ■975 
 
 t-12-5 
 
 1 491 
 
 9fiO 
 
 - 
 
 ■158 
 
 4- 
 
 ■2S» 
 
 - 1-2 
 
 - 971 
 
 1 
 
 ^- •S20 
 
 + 
 
 •K31 
 
 — 
 
 ■952 
 
 - 4 4 
 
OKBIIS OK IHK SI'K(TK<)S(l)l>Il' fOMPONKNT.S OF BO.S.S 2484 
 
 405 
 
 NOHMAL KyUATlONS 
 
 7 •.")()()/ fCiSyrw/ 
 
 + <>-87(u- +,S-71(i/y 
 - • <S()tu- 
 
 - -m^z + -T^Sii + •47'> - 
 
 + 2-.")7.")/^ + ■()7t)r 4- 
 
 \V.\Sz + ■■.i-U]„ 4^ .()27r - 
 
 -f- 'Mik +:i- m:\ii - •082r - 
 
 ■2»6»r -2 320 = 
 
 ■]'-,{> I r -2()0i) = 
 
 •U.V)^' + .(if,;} = 
 
 + ■7\)S.r +207% -f- lyOz +;ifiti;{(/ - .082r - Wlir - 189 = 
 
 + •47i).r f ■()7()// f (127' - (IS2// fi;w:)r -l-8o2(r -3-7(J0 = 
 
 - ^OOx + liVJ// - O.V); - I Mi/ -lSo2r +2 (i47(r +:)164 = 
 
 From tlic-p tli(> following corroctiuns woro obtainod. 
 
 67 = -III km 
 bK = +\'M km. 
 5/\i= -i:?(l km. 
 
 OC - - •()()() 
 
 5w = +0°17 
 
 67' = -OOi;} (lay 
 
 Tlic value (if 1"/'" foi' the normal i)lac('H was rcdiK-cd from 105 to 95- 
 The prohat)lc error of a plate, based on tlie ;50 employed in the solution, is 
 ± :{S km. i)er seeond for the primary, and ± .')■;? for the seeondarv. 
 
 Th(^ following, tlion, are the revised olrmrnts, with their probable errors 
 which are given as i)rovisional for ihe time being. 
 
 /' 
 
 = 
 
 l.")-98() days 
 
 (' 
 
 = 
 
 ■504 ±025 
 
 a' 
 
 = 
 
 355° -2 ±7°0 
 
 0)1 
 
 = 
 
 175° -2 r7°0 
 
 A' 
 
 = 
 
 63 '34 km. + 3-35 km. 
 
 A'. 
 
 = 
 
 73 fM km. ±3-98 km. 
 
 7 
 
 = 
 
 -13- 11 km. ±3-50 km. 
 
 T 
 
 = 
 
 J.D. 2,419,408-027 ±143 
 
 (1 sin / 
 
 = 
 
 r2,()2t),()00 km. 
 
 (/i sin ) 
 
 = 
 
 13,981,000 km. 
 
 //( sin"' / 
 
 = 
 
 1-48 Q 
 
 ni^ sin' / 
 
 = 
 
 1-27 
 
Kt(i 
 
 I'l HI.H AlliiN> "I- niK l)iPMI\ln\ i iHSKUX A 1 c il( V 
 
 .;:3 
 
 
 I 
 
 III the acc()in|)an.viiiti uniph tlir contiiUKius curvr irincxnl.- tlic ])niiiai\ . 
 the (lotted rurvc \hv MTon(hir\ . Tli.' npcn riirlrs represent the tinm\}V(i 
 observations used in tl,,- least-scpiares solution, while the dots represent the 
 unused observations irr.Miped u-uallv two to-ether. The latter -^liovv the etTeet 
 of the blendin^r of the >|,eetra on the niea-ureineiil . a- they all lall off the main 
 rurve on llie -ide toxvard- th.' vhne Thi^ c.nditinn i~ preferred, however, 
 to usit;y; their erroneous \;due> in the -oliition. 
 
 Doniinion < )bsi'i-\atory 
 Ottawa 
 
 April, l'.)Ui. 
 
 'id* 
 
 '15* 
 IS- 
 
 a. 
 
 
 ^[ \ ! 
 
 Diys 
 
 l'lunl,-.lu.NAl. Vl 
 
 Ai. Vi-LOCiTV Ciiivi;s in Hos." 2V<i 
 
 • .,,1