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DEPARTMENT OF THE INTERIOR 
 
 CANADA 
 
 How. W. ,1 RcxHl. Umutrr, W. W. CoBT, C M.fl , Deputi/ Wnu(«r, 
 
 PUBLICATIONS 
 
 Dominion Observatory 
 
 OTTAWA 
 
 * , . V2V^ .^JV. F. Kino, C.M.c.., LL.D., Director. 
 
 V«^^^^-''^^'^ 
 
 Vol. I, No. 4 
 
 Orbit of 88 rf Tauri 
 
 BT 
 
 W. E. HARPER, M. A. 
 
 P 
 
 CAl 
 
 MT 40 'j 
 
 POl-'J/. 
 
 OTTAWA 
 
 Government PRrNxiNo LHire.\u 
 
 1013 
 
con.FPmYTf^"^MOl!F RlBUniHEUUt 
 
tiuLL ruLntLHi^ioUt BliiLIOIHEO'Jf 
 
 DEFARTMKNT OF TIIK INTERIOR 
 CANADA 
 
 H.iN, U I U'.IJK. Uini.-.r \\. U. O.lir, CMC. I), iiulj .\fimtler. 
 
 PUBLICATIONS 
 
 Dominion Observatory 
 
 OTTAWA 
 
 \V. V. KiN(i, CM.'.;., LL.l)., DlrccloT. 
 
 Vol. I, No. 4 
 
 Orbit of 88 d Tauri 
 
 BT 
 
 W. E. HARPER, M. A. 
 
 O T r .\ W A 
 (ioVBHNMKSi Fhi.misc; I!rilK.\U 
 
 I'JI :; 
 
4 \ 
 
(•i.'iii I <ii ^^ '/ r\ri!i. 
 
 Il\ W . 1.. Il.\i(l't;ii, M.A. 
 
 Thi- -tar wlm-c li^lit a-ifii-inii i- Imir Ikiiii- \\\\v[\ mimili- ,|.'clin:it ion 
 
 ,i,,ilh nine ilri'.rccs lilly mvc iiiiMc-. iilinldiiiaplii'- in:iiiiiil u.h- I..") was 
 
 aiinnuiiii il a< a ■.p(•l•!nl^(■(l|lil■ liinary by Moni'' in I.. <• K I ICJ I'.H), A 
 sfcdiiil aiiiiniiiircnu'iil a- \n ii> l)inai> iiatiiiv \\a> iiiadr la>l yrai' Iniiii llir M t . 
 \\il,Mili ( >l.MT\at(U> . l'ii,--il)l> a> it \\a- ;iivrii in tlirir li>l liy the nunihcr SS 
 llir\ hail ovcrhKiisrd ihr pic\iiiii> aniiniiiircniciil ni ihc -tar iimiiT the 
 (Ic-iiiiiaiiiui '/ 'I'auri ii\ liir l.ii'l'; astiniiniiici'.s. 
 
 'I'hc early (>lisci\ali(in- uf Moiirc. Ii\c in niinihri', have provivl of 'j;n',-u value 
 in (Ictnniiniiiii the iiciiod I'lciwcm ihr lii>t ch-ri \ at ion at l.ick and ihc la-l 
 (inr hcif an inlri-\al "i abnui 7."(() nciind- has rlapsrd. mi that it is pi)»il(lc lo 
 alTi\c at a value Inr the pciidd which niu-i he vcr\ ncai' the true value. '1 he 
 p(>ri(id :!..".7I1 days was con-ideied the l.e>t until the oh-ervalious were ;;n)Uped 
 and a solution made, when it was >een that liy inereasin;:; the period to ;!..")712 
 (lays :an increase of ahout nine secoiidsi a much lietler atireement with the 
 curve would l)e secured, 'I'lus latter value, then \va- the peiiod a<lol)te(l. 
 
 The star is of the hydroi^en type lieiiej; desisiuated .1_. in the Harvard 
 cia.'silieation, thoUiih it a|>proaches somewhat neaicr than that lo !• type us, 
 with proper e\|)osiu-e a numlii r of nu'tallic liiiis in the spectnuu are >een. I lu> 
 sin^ile-prism camera wa> used I hrouirhout , and of the '-'s plates secured S were 
 made on .-^eed M) enmlsion. 1 on Seed 'J:! and H'; on the rei:ular Seed 27. The 
 lines of the spectrum should he fairly well nieasurahle if the plates secured were 
 of uood (luality, l.ui the continued p(!or oli,-ei vintj weather of tlu> pa-t nine mouths 
 oi' ^o has rendereil ace<'plai)le almost an\ kin<l <if plate. As a result tile 
 
 42238— U 
 
I'l HI.K Al |IPN> iih int'. DilMIMllN i ill>l.li \ \ I i i|i V 
 
 V('l<»ritio> nlit:mir.| li:i\c ;i laicir |iiiili;ilil(' cinn- tli;iii ol liii>-, i-c uimiM Ik- ihc 
 (•il.--r. liut tlii' t;iirly liiiili iMiipr in \cl(icil\ nimiicii-alo lor tlii^ Ut a nital rxliril 
 :iiMi [iriiiiii- ni' a laiii\ accmalc lirlcriiiiiiatinh cf liic (prinlai clcinriil- Sdinc 
 lilies (I'lc t<i till' ^piri riini df tlic xruiid c-(>iii|i(iiiciil arc l'aiiitl\ \i>ililc. the (iiicr 
 Siniiiicil Sciil _':{ |ilaic> hciiiu moif -iiiial>lr in ncuiil ilir>c, I'lulhrr iiHiiiKin 
 will lie luailf (it llii.- later. 
 
 Hc>^i(li- till' tiiai;iic-iimi line ami tlic Hik > iluc to li\ ilioiicn ilicif ucrc \ i>it]|c, 
 a> |ilr\iijii>l\ Mil lilidiicil. liHlallic luii~ wliirj] wirr i|uilc fiiM|iiciilly iiifa.-uialilc. 
 Till- arniiii|iaii\ iim laMi' iiivr- ilic line- iii(i>i (iitiiniiinlN uica.-MMil ■ anidiii; llioc 
 it Will Im n"iic(| air iiiaii\ lim - iliic to imn. It ha.- licrn i-ii<|('Miai> to oliiaiii 
 corrriMrd \alii<> oi' ihi ua\( -Iriinili. |,\ roii.-iiifiiriji llic roidiials I'or carh line 
 In II! ilii mean ol the plate ami (i|iialili!i their -iiin to zelo. I>iit nuinir to the 
 |>o(il (|ilallt> ol the |)late> thi- pideediin' ha.- Hot heeli carried out in thi.-^ ciisc. 
 At best. oiiIn thre<' line-. A |:',.'._'. .\ i:?(l,S and X 4'_';5:i would si-ciii to be in need of 
 correction -o that the re\ i-ed \clocitie- would not dilTer iiiateriallx' from those 
 herein gi\eii. 
 
OKBIT or 
 
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 \va- ai'crjitcii. 'I'lir wci^ilit a>-ijiiiril a platf wa.- ha-ril |)riinaiil\ i>n llir nutnhcr 
 ami \Mr.ilit (if llir lilies iiica uiiil. Tlic plali'> wen- \vcii.;li!i'il in'li'p''mlrntly 
 iipnii i|ii ha-i- of the i|iialit\ of the ]ilalc liui (iiil\ in dii'' ra>c «a.- it fiiiimi 
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 .Vi.")J. W hrii 1 lii- plaii' \va> ma.dr the ti'iiiprrat iirr runtrtil wa- pdoraii'l its weigh i 
 was reducr'i frnin ;) in ."). 
 
OUUIT OF 88 d TALia. 
 
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 \V1 Ui 
 
 ll'.i-3 i 
 
 i:il.:i i 
 + i:!l S 
 
 IIKI .'i 
 1)4-2 
 .^,4 2 
 
 'I'l-.", 
 
 if,-i; 
 
 .',ii-2 
 r,s ;l 
 S4 2 
 
 1 
 
 71-2; 
 
 + 7:1-0 
 
 f 127-;!t- 
 
 - 2(1-42 
 
 - - 2S 
 ■2S 
 
 74 - 4.'i 
 2(1-11 
 
 ■2;! 
 
 -f 44-,'; 
 
121) 
 
 nniii \nii\> oi- iin-: I)"mi\hi\ i lH^^:l(^ \ inin . 
 
 MK \>ri(K> (1 
 
 I '/ TMIU 
 
 t, 
 
 .•.K4 
 
 ». 
 
 
 4 
 
 4S1 
 
 1 
 
 ii;v 
 
 I 
 
 mi 
 
 4 
 
 ii.'ij 
 
 4 
 
 341) 
 
 4 
 
 :!■.>.•. 
 
 4 
 
 :!i)s 
 
 4 
 
 ■.•<H) 
 
 4 
 
 ■-'71 
 
 4 
 
 ■JiKI 
 
 4 
 
 ■SM< 
 
 4 
 
 :;;!;( 
 
 1 
 
 14;! 
 
 4 
 
 ini 
 
 4 
 
 071 
 
 4 
 
 im:! 
 
 4 
 
 (14.". 
 
 4 
 
 .iKi:. 
 
 ;t 
 
 ii:« 
 
 V.l. Wi 
 
 111 1. ; 
 liiii :, 1 
 
 \". 1 \\i 
 
 nirjui 
 
 \ , 
 Ciii', 
 
 Volocil \ 
 
 11 1 1 ■, 
 
 10'.I!17 
 - '.".I HI 
 
 I -^1 
 
 V.l \Vl 
 
 Vol. ; Wt 
 
 rrn i 
 
 
 Wl. ! Wt 
 
 82'G ) 
 
 
 
 
 ff.'l 7(1 
 
 - M :i7 
 
 Js :iii 
 
 ■ ■> M 
 
 ■ 2H 
 
 Js 
 
 + !l."in 
 
 ■ 1 HI 1 
 
 .■t:i ; 
 
 711 II 1 
 
 Vrl. Wt 
 
 7r. 5 
 
 - 70 IKI 
 
 + LN.S7 
 111 
 
 •2S 
 
 - Ill II 1 
 
 1.7 II 1 
 
 ns:} 1 
 
 41 11 ;. 
 
 ,".:; 7 1 
 
 l> II 1 
 
 .■.:. s 1 
 
 1.". s 1 
 
 :>:t .-. 1 
 
 4-.'i 1 
 
 5ti-4^ S 
 
 - 110 'J 5 
 
 r..2;!7 
 
 Vel. Wl. 
 
 .>S.2 1 
 
 .I,-.' , 
 
 111 :i 1 
 
 i.J s I 
 
 .'..-.: I I 
 
 .-.N r. 1 
 
 4.-..; \ 
 
 11) 1 1 
 
 1(1 2 1 
 f.;i .-. I 
 
 11 H 
 
 - ."..'71 
 
 + 'j:! -r. 
 + 111 
 
 ■'Js 
 
 - :t,'i 1 
 
 'm-'2i 
 
HiBlT i)K SS (/ TMKl. 
 
 121 
 
 MEAbUREH OF d TALKl. 
 
 \ 
 
 
 ,5,2 is 
 
 5 ''y^ 
 
 ."i.2(i(i 
 
 .-,,2'M 
 
 .5,:iiKi 
 
 .5.:i02 
 
 o,:t07 
 
 X 
 
 V.l \\i 
 
 \.i \\t 
 
 \.'l \\t 
 
 V.l \Vl. 
 
 V.l \Vi 
 
 Vc4, 
 
 \Vt . 
 
 Yd \Vt. 
 
 •t..'iS» 
 
 4. 7)40 
 
 
 + i;i 1 
 
 - 1-2 1 
 
 1 
 
 + 47-2 1 
 
 1 
 + 124-6, i 
 
 
 
 
 
 - ST :v ! 
 
 lT-4 \ 
 
 12 11 \ 
 
 + S-6 \ 
 
 4,.V22 
 4,4S1 
 4,404 
 
 4.;t.w 
 4,:i4() 
 4,:i2."> 
 
 !"■■ 
 
 
 
 
 f S7 ■ s 1 
 S7 5 1 
 
 Hi-:, J 
 
 + ITS 1 
 
 + IM 1 
 
 ;!7 1 
 
 ^ 111 7 1 
 
 7 ;t 1 
 t •". 1 i 
 
 ,■>() H 1 
 44 1 
 
 12^1 1 
 
 l.l ',1 1 
 lil I 1 
 li.") ti 1 
 
 lOS-2 ; 
 
 (S9-4 J 
 84-2 J 
 101-2 1 
 
 mil ; 
 
 122 1 
 
 llil-T) \ 
 0,5-2 1 
 
 lO'.l-O . 
 !t.5 1 
 
 + 102 1) ;, 
 
 i; 
 
 - 2 ■ '.1 
 + l-:i 
 
 + « 1 
 
 -t- 11-2 J 
 - 12.5 i 
 
 4,;iiis 
 
 
 1 7 i 
 
 ^ 2ft i 
 
 4,-2<K) 
 
 
 
 4.271 
 
 4,2li<l 
 
 4. -jar, 
 4.?:i:! 
 
 
 - 4-0 1 
 
 + 2 2 1 
 
 
 
 
 + 12 1 i 
 
 <.)10 1 
 
 + .-.4 1 
 -t- 1.". () 1 
 
 + <■'•'.) 1 
 + T-O 1 
 
 +- I :i 1 
 
 7 .'.1 1 
 
 . l'l-."..S 
 
 ■1.". 
 - ^s 
 
 
 S..5 1 
 
 :!4-s i 
 1!m; S 
 :iO II ; 
 
 - 22 - T 1 
 ^ :i :i 1 
 
 
 O,-)-? 1 
 
 ,-.0 1 
 
 ,')H (t 1 
 f ,"i0 1 
 
 1 
 
 1 
 
 4 IIU 
 
 t- 0-7' 1 
 
 4,071 
 
 1 
 
 
 4,()ii;i 
 
 4.04,5 
 
 4,00.') 
 
 sti-2 ! 
 
 + H1.2 S 
 
 t ss .-it 
 
 ■ \r, 
 
 -2S 
 
 :i'.i 1 
 - 20 " 
 
 4 
 
 ! 
 
 -- HI 2 ! 
 - 11 -9 1 
 
 
 
 
 
 IIHMH 
 
 V, 
 liirv. 
 
 • .-,1 sr. 
 
 • 1 t :ii; 
 + 10 
 
 - ■ 2S 
 
 . 104 ;io 
 
 11) S'l 
 
 IMI 
 
 - 2K 
 
 - MV2 
 
 - ll-:i.5 
 
 02 
 - 2-S 
 
 ~ 24-1.5 
 
 - 10-41 
 
 ■ 12 
 
 -28 
 
 - 1 5S 
 
 - HI-2T 
 
 02 
 
 -2H 
 
 liatliiil 
 Vr'loiity. 
 
 t lOS (1 
 
 + 2<lti 
 
 + CO 
 
 + !i:m 
 
 - i;i :i 
 
 - 41 
 
 - 21-2 
 
122 
 
 ■i Bl.U .\ll«iN> Hi IHK DOMINION i 'IISKU\ A lOU V. 
 
 MK \>1 KKS ol '/ T\t HI 
 
 
 
 , i:i7 
 
 Id 
 
 ■JS 
 
 .'>'J 
 
 _ 
 
 1!) 
 
 
 ■2S 
 
 I{:t<lilll 
 
 111** 1 
 
(iHIUl I'V SS il lAriil. 
 
 12:^ 
 
 Tsinn the adcliKMl value cf the pcriorl. flic .•l.scrvations of the main 
 impDUoiit \v(>rc coiiiliint'U into ten tiroup- a- fullows: 
 
 NOHMAI. ri.A( K.S. 
 
 .\Ic:l1i I'luisr. , Ml 'III \i-l 
 
 1 
 
 ^; ijii 
 
 2 
 
 ■ZM 
 
 H 
 
 ■771 
 
 4 
 
 1 :(•■.-> 
 
 5 
 
 1 rjil 
 
 fi 
 
 1 '-^',1 
 
 7 
 
 _' 170 
 
 8 
 
 ■J. ",77 
 
 9 
 
 ■2'XH 
 
 10 
 
 :M21 
 
 + 102 '.IS 
 + 97 -^i.-. 
 + ;i7-7il 
 
 - IS 91 
 
 - :t7W 
 
 - 37-.>l 
 
 - .'tj :tl 
 + 21 10 
 
 + r.O!X) 
 
 + 78 00 
 
 lllill. 
 
 1 
 
 1 
 
 l{.>!.lllall)-C 
 
 l']iiu;itinn- 
 I'.pliiiiipns. 
 
 1 s 
 
 + i.ir, 
 
 + 07 
 
 2 :i 
 
 + -57 
 
 + 09 
 
 1 :> 
 
 - 337 
 
 + 07 
 
 1-5 
 
 + GO-l 
 
 - 12 
 
 1-2 
 
 - 2-97 
 
 - 03 
 
 2 
 
 - -97 
 
 •00 
 
 2 
 
 - llif, 
 
 - 12 
 
 6 
 
 + 7:)i 
 
 - 14 
 
 10 
 
 - -92 
 
 1 + -08 
 
 1-8 
 
 - 1 22 
 
 ! + -14 
 
 A iilot of tlu'sc showed that ihe eceeiii r'leily \va-> very Miiall. Where this 
 is the case the value of a- eaniiol he ih teriniiied with any irreat dejiree of aceuraey. 
 Sexeral trials were made with w in d.ilTerent (luadranis and correspoiHliny; values 
 for 7 and a value for to ahoiit (r .-eemed to he hesl, judirinu: hy the sum of the 
 squares ,,| the vsidual-. V.'ere it not for the third and ei'ihth normal plaees, 
 ,,.i|.n,.,ilarly the former on aeeouni of its irreati'r weitiht. a value of the 
 recent rieity praciicall\ zero wonl.l -nil the ohscrvation- almost as well as any. 
 Where l.olh spectra are present. a~ in this ra^e, the tendency of the measured 
 velocities around the 7-liiie is to deviate from what should l)e their true value 
 towar.ls this hue. and conse(|uently the velocities of lhe.se two firoups are 
 somewiiat ill error. A sli^lil error in the <leterminatioii of th<M'l(>inents will result, 
 pariicula; y in the ease of r which will have a somewhat larfjer value than its 
 true one. Imt. on the whole, the tendency will h- for th- errors in each uroup to 
 iieutrali/.e one another. 
 
 I 
 
124 
 
 ITHI.K \llnN> (11 nil. DiiMlMiiN i iHSi;H\ \ Ic iin 
 
 Tlic values a(loi)l('(l as prclitiiinary were tlic follnwiiin. 
 
 I' = Arul2 (lays 
 
 r= 02 
 
 w =0'" (tixiMl) 
 
 A' = 71 km. 
 
 -y = -^ -JO-.^s km 
 
 T = .). 1' LM17U1S171 
 
 Tho valiio of a' was cnnsiilcreMl fixrri: nthcrwisp tlip solution would horome 
 iiidotorminatc llirounh the cocMiciciits of to and T lu'ing nearly equal owing to 
 tlio small \alu(' of < . 
 
 With these elements were computed, acconliii!; to the ditTerential formula 
 of l.ehman-Filiies*, ol)servati<m e(|Uations connecting the four elements 7, A.', 
 r and w with the resiiiuals. lor the sake of hon;ogeneity the following 
 sul'stilutions were made. 
 
 J = 67 
 // = «A' 
 z = K.r 
 K 
 
 " = (l-e') = 
 
 M. o7' 
 
 )liSKHVATI(I.N KgUAllONS inH d TAIRI. 
 
 
 J 
 
 w 
 
 z 
 
 u 
 
 
 1 
 
 t IHUI 
 
 + -082 
 
 + -848 
 
 - 2S4 
 
 - 3-66=0 
 
 2 
 
 1 .IHMI 
 
 + •92!) 
 
 + fJSl 
 
 + -4,^1 
 
 - 2.38 = 
 
 3 
 
 1 (Km 
 
 + -193 
 
 - -944 
 
 + .(in'J 
 
 + S-Bl =0 
 
 4 
 
 1 (HK) 
 
 - ■7;« 
 
 + 141 
 
 + -BUS 
 
 - 6-57 = 
 
 A 
 
 1 000 
 
 - -o.-w 
 
 + -sao 
 
 -t 2!I7 
 
 + ,86=0 
 
 6 
 
 1 IKK) 
 
 - -'.mr, 
 
 + 941 
 
 - • ItiC) 
 
 - 1-40 = 
 
 7 
 
 1 tMM) 
 
 "- ■ 77it 
 
 + 271 
 
 - -587 
 
 + -84=0 
 
 8 
 
 1 IMHI 
 
 - 197 
 
 - •905 
 
 - .968 
 
 - S-48=0 
 
 9 
 
 1 (HKI 
 
 + -421 
 
 - .(iss 
 
 - -930 
 
 + 2 m=o 
 
 10 
 
 1 (KHI 
 
 + -701 
 
 - OKO 
 
 - -752 
 
 + 1 3.S=0 
 
 •Astronomlche Xaclirichten U242. 
 
OKBIT Ut !SS d lALUl. 
 
 125 
 
 Thcsf wlu'ii transformed into iionnal ciuatioii.s w.mt us lollows; 
 l.VTOOj- +O.K)/y +:5s:.4c -\m)u ' 11-,SSS = () 
 U-77(i,7 - '.'Tti: ' iVi.')!/ + llti;5 = 
 TIJiWJ - l^.')/* -l.s-7'J2-() 
 
 r)<,).'>4i< + •:«2 = () 
 
 from which thu following .■t)iiTctions weiv ui)tuiiK'ti. 
 67= + ' M l<m- 
 6/v = +i;J l<m. 
 6< = + -0:i.') 
 57'= • •()(»») 
 Thf sum of tl. stiuar..^ of thf ...Mtluai. fur .hf normal piaffs wa> roduml from 
 1,S2S to i:i(>4 ami ouf solution was foun.l to 1.. MiHirifUt Tin. ..orrfft,..! values 
 of the elements, with tlieir i)rol)aMe errors follow; 
 I' = :iry7\2 (lays 
 e= -Oiw-t OU) 
 
 £0 = 0" 
 
 A' = 71i;} km.- 1 11 km. 
 7 = +29-72 km. ajyf km. 
 .4 =75-04 km. 
 /i-G7-22 km. 
 
 r = J. D. 24171<)Sl71i Oil 
 a M/i (•-3,487,600 km. 
 
 The .lata regarding? the seeoml eomponent are eolleeted in tlie K.llowiug 
 
 table. 
 
 D.\TA OF SKCtiNl) ( OMPONKNT. 
 
 Velocity liKreitHKi) th Line. 
 
 ; 
 
 
 
 NiiiiihiT 
 
 Wt-it!ht. 
 
 m, 
 
 Plate 
 
 
 
 
 
 
 
 
 
 //( 
 
 
 ('4Hu(rtjiu'in I. 
 
 Cniiipuni nt 1 1 
 
 
 
 
 
 (cuuiplitt-'l) 
 
 
 
 
 
 
 
 
 
 
 -65 
 
 4,HoO 
 
 + 72 '.1 
 
 - 113-0 
 
 - 
 
 
 '40 
 
 5.21>.l 
 
 -tiO 7 
 
 + \M \i 
 
 - 
 
 
 •38 
 
 r,.Ti7 
 
 -ti2 4 
 
 + U>4 » 
 
 - 
 
 
 '46 
 
 5,313 
 
 -05-3 
 
 + 140-4 
 
 - 
 
 
 • 66 
 
 5,3'2<l 
 
 + 73'.) 
 
 -111 H 
 
 
 3 
 i 
 
 •41 
 
 5,34H 
 
 -tit) -7 
 
 + 11)3-3 
 
 ' 
 
 •52 
 
 5,309 
 
 -.58S 
 
 + 114 1 
 
 
 
1 ■_'••. 
 
 I'ini.ii \riiiN~ "I iiiK KiiMiMiiN iin>Ki<\ \r'ii(v. 
 
 Tin niiinli:"- i)f line-; ami wir^lit vU-v ut' I'lHir-r U> tlic second coiiiiiuiiciit. 
 It i.s llius .-.•(■II ihai till' iiifdrriiatiuii uc lia\i' icuanlinv. it i- iin-iiin' imlci'il tliiMii;li 
 there is no <lotilit as to its reality. 'I'lie s|ie(iiinn appeal^ in In' -t iliipln-ale ut I hat 
 of tlie main coniiunieiii 'i'lie ratio o!' llie niasM- is i:i\cii in the la-t roliunn 
 anil 1 lie \\.ililiteil li:eaii tii\es 
 
 III, 
 
 — = 17 
 m 
 
 Tlii- ratio i.- niiieli -inalli'i' than ilie aviia'^e. Uie limiieil niinilni' already known 
 \ai-\ini: from d 7 lo iinil>'. Tin' \alue oi' m .-//. / i- '2-7. 'I'lir piohalile eiior 
 
 ,,f a plate i- oil km. per -ecoml The elir\e repl(-enl~ the eoin rleil elelii. Ills, 
 
 ihe Lriiiiiped \clniilie- lieinu. shown. 
 
 .MintADI \1 
 
 In the int(>rval lietween llie eoinpletiun ot ihe toi-e;.'oini: ami its piililieai ion 
 in ihis extended t'oini llie delermiiial ion of the .-aliie nrliit liy \\ ilxin ol t!ie l.irk 
 ()l)servator\ ha- eonie to hand. The -tar, a- pre\ iou.-ly .-taled. \va- aiinoimced 
 a- a liinar> li".' .Moore of the l.irk oli-er\ alol\\ lull lietol'e delinitely eommeneinu: 
 work on it here in I'eliniary. l'.H2. we iiad t he eoii-ent el' I )i-. ( 'ampliell lo iiinreed 
 with the determination, lie -ii^iie-ied in a h'lter lo Dr. I'la.-kett ilial a- Dr. 
 .Moore wa- leaxiiisj; lor Saniiajio wr had lnUer take I he star on om- li.-i. The 
 )ieriod wa- deiermiiied li.\ the wiiier on Sept. I'.l. I'.tlL'. hut wa- not announeed; 
 otherwise the dupliealion oi ilie woi'k iiiitihl lia\i Ini; ,t\(iided. as only one 
 oliservatioll, outside of the original li\c, had been made at ihat time at the l.iek. 
 
 The elemenis as ulitained liy W'il-on from 'Js ihree-pri-m plates are as 
 
 follows: — 
 
 P = :i r>7\-2\ days 
 
 A" = 7G;5-J km. 
 
 7=+2S-tl'.l km. 
 a sin ('=:5,7lN.il(i() km. 
 
 Owin^ lo the greater di-peision ii-ed. their plate- have a much lovsir prolialile 
 error (' 1-2 km.) than oiii's ' ii-li and eoiiseiiuent ly ihe element- just jii\en 
 should tie nioi'e neaii\- eo!-|iii than our own. The oiilv noiieealile diHereiiee 
 i;i the iwo ill teiminat ion- i- in ihe negative ma\imum. Then' eii'\e show.- a 
 maximum nei;ali\e \alue of IN km. We ha\e nejiatixc velocities t U and 42 
 
OKBIT OF 88_ti lAlUl. 
 
 127 
 
 km but tho solution roducos tho maxiiiiuii. tn mI.uuI :?s km., h. ih;.t there i.s 
 this .lifferenee. Our .■ee.ntrieity is ()().V. ;,t l.i.k tins is tuuiui \n l.e tl. 
 
 T1i()Um;I> ttiis <iiiTereiice is iiraelicaily iie;;liui 
 
 lie it eaU,M> .-(line ol tlie (iisere|i;mey 
 
 + 90 
 
 + TV 
 
 + JO 
 
 4- X 
 
 ♦ /o 
 
 „ ,1... neuativ maximum, an.) this latter a<r.in„i.- Nvh..l!y lor th.- .liO.'reure m 
 :, km. in A', 'l-he p.'ri.xls are tli.' same. The masimum positive %eloeiti<s are 
 the same; tlie (ltta\VH maximum oeeurrinn d IM)1 .iay> later than the l.iek. 
 
 0„, i„„,ortant it.TU revah.! l,v ti,e Ottaua plates, an.i of which': .nentioM 
 i. ma.ie in the Liek .h^termination, i.- the pre>ene.^ <,l th.' se,-oml speelrum. 
 While th.. lines ar.. not of th.' lust <|Uality l..r n..a,MUvm.nt tiier.^ is no d.nil.l 
 as to the reality of their pres.'n. .■ an.l thus u.- .an .hl.Tmm,. th.. ratio ut the 
 masses of tli.' two e.imijoiicnt.s. 
 
 April, I'JKJ 
 
 r 
 
 iti^^ 
 
 z J 
 
 Vilocity Curvi' cf i I'miri.