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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 "Al'RI. LINKS I '^KlJ i.N (i TAl Kl. l.iiK-. .\\tr;lK<- Kli- Aluitiniic im-nt. Hii<iclii«l iirifl. 4 ,5W01« Kp 4 .M« "lit) Ki-Ti ISl IIKI Mil lot 'iJ7 1. .I.V." iKHi 1 r-Mi! IllO tVit 11 :i'j.'i s'j!i !,■ :iiis (iHi I'P + 4-2 + II + J t - 12 - « + « 2 2K 111 u \.m- mcnt » 271 7ti<l Vr 1 ■-•:((■. 1117 IV 4.2:t:t :t2H Kl 4.14:i '.t2.S Kl- 4. 1171 !KI1 Ki t.lKi.! 7."iti |-. i.m.'i !I7:. K. 4.l)<).') .•.(17 K. AviT iKi AlKchrrn*- 1'4 3 6 6 1 22 4-4 3-2 2 17 urctl. 16 13 17 H 9 IS 22 IS 'I'lic ol»('i'\atiiiii.- of tills star nhtaiiicil al dtlnr -iIimtx atoiio witli tlirir residuals arcordiiif; to tlir I'lfiiiciits ulitaiiii'il Ihtc arc ni\('ti. 'I'iii'ii fdilow tlic liatii of our own ()l)st'r\atioiis ami tlic measures in a riiinhineii talile. MKAsriiKs OK fl TAlHI A'f MTHKIi OBSEUV ATOIilKS. ( t|>s< l\;ilrirv DhIc .lull 111 II u Pli:i«'. Vr lint v. Hc!-! 1 ll-C. Lirk PKl'i \(1V 18 1 J.1I7 7 ,111s 48-> si:f sss >,H)t"i 717 :i .-.2!» It (IOI< + + + 51 103 lis 7 1) 8 + - + 3 1 ,-> 0-3 . 41 KHKi 1007 Oct. Auk M M mil Ort. (Vt. (let fi 13 . . 7 (1 ,>».').i ,862 :u',) "•52 895 '.KKI -'111 1 '.111 1 s7ti - 44 43 3 4 - 61 8-2 «■ U Mt W Ison 1^ " N"v ;i <( :!(! ^i:«i 1 ftl)7 40 _ 3- » I'.iij .l:u, •'■ ',1 1117 S'J'.t ■ .-.Hi + 71 - 2- lis ri lu.ic \ I ii'N^ IF I hi: i)(i\u\ii i\ I in>i;ii\ ak un . ■i A 111.1. Ul' iJUbKUVATU)N6 Ol' (i TAIKI. CoMPIINKNT I. CiiMI'mNKNT II. I'lMf III.. Date. ICx. Julian Date. I'hXM'. Vrl \\t. o- V' 1. W 1 1 '-C. 1 l',«)S in. r 1 ,OlM (• N..V l:i |:i J, 11N,25'J 0>2 2 ■-".15 - I'.l 7 " - 17 ■j.iin II I).-,' 'I I'.UJ lid s , J.s5 • OJS 3-2,53 -h Ni'.i 1 11 4.s;ii 1' I'.h. 12 45 ■.1.445 602 2-577 + 21 1 + 7 ■ 7 4,8.50 11 111). 20 02 '.), 4.53 012 3-144 + '.10 7 5 - 5 9 - S3 3 1 4,8.54 II IVl). 21) CO |.I,4.50-63'J 2 ;ioo + 45-8 .5 - 7-4 4,856 11 Feb. 27 7.5 0, liJO (J2y 3-310 + 97-4 4 -I- 1-2 1,><."|<1 (• \\h.-2s .50 '.1,401- J'J7 -710 + '4-5 ,5 - 4-0 1,S70 11 Mar. ,5 . i;o ',1,407 003 3-151 -\ A.y-3 7 - 20 1,N-I M .Mar. 12 . r.5 ',(,474 -503 2 ■ '.M)8 + 68-0 5 + 0-0 l.^-l 1 Mar. in. . 55 !i, 475 500 ■340 + 95-0 6 + 6-3 .-,,171 11 .\iiu. 27 40 <,l,t')42S00 3 124 -4- 109 7 5 + 7-3 ."..17^ II .\iii:. 2'J 55 '.1.044 ■S57 ! - '• 1 11-^ 1 t 1 .■),'Jl'.i !■ Urt. 4 7.5 '.I.OSOH.;! 2 1 Oil - 20. 1 s -T 1 ii • IMI 1, 1 r>.Xi7 1'' Ort.7 7.5 !l,6f:i-M0 1.5.50 - 351 7 - 2-1 -fl'.i3 5 1 .5,'J4N 1' (let. If) 75 <l, 002 020 3 ISS ' -fios.o 4 + 4-0 ,5,2,52 11 on. 17 .. III <.M.)'.« '.HI '.K12 + 20 6 -f 2-6 .5,21)6 I' ()(■(.:«»... in !l.70t) 7:i'.i :; 015 -, 70 li 7 + 3-6 ■>.2'il 1" IV<-. 20 .57 , 757 6,52 ■301 + 93 1 7 -f 5-4 .5,:>iHi r Dim-. 21 l'.)l:l :iO ',l,7,58.00!l 1 378 - i:i3 2 + i - 4 .5.:jivj 11 .Ian. 1 110 '.i.7ri'.t iiMi 1 iiM - no .5 - t 1 .5,:i07 11 Jan. N 50 1 'i.77ii 010 1-463 - 21-2 7 + 7-4 ,5,:ii:! 1' Jan. 12 70 I •i,7.s01).50 1-932 - 30-0 7 + 5-6i + 170 1 1 .5,:i20 P ,Ian 22 0,5 i '.i.7'JO072 1-210 - 10 6 + 1-4! .5., Till II Jan. 2H 54 , 0.7'JO 642 -007 + '.IS 6 - 4-7l - 82-1 1 ,5,:{4s II I'VI). 6 <H) ■■ 0.WI5-5I.I:) 1 .S70 - 41 5 9 - 4 5 + 193 3 ,5,:i.59 r K.l) 12 r>0 0.811 -,556 697 1 + 42-0 5 — 8-0l .5.:wt 1" Feb 17 0.5 0,816 -522 2-091 - 31-1 5 - 20 + 143-8 J .5,i:i:i 11 Mar. 12 7,5 0,839 •,536 107 ! . lll^ 1 1 + 5o! ! ■|'hi' il(iai!i'<l nicasiircs nl tlic L'S iilatcs I'ollow. In a few rn-<fs tlir platos WiV rrliica.-urcii ami llir lurali ul' ilir ^•.-llll^ a.-~ liivrii in llir .-uinmar\ iit' inca-iirr.- \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 liccr- an In rlialiuc liir wi-i^lil- ;i-sif:il('(l. Tlli' CNrcplinn wa- plair llllllllicr .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. 119 MKAhlKEti OF (/ TAIKI. 4.Sf>l 4 , ■)H4 4,. '14 'I 4.:i:u 4 , ■•■22 l.isl 4,404 4.;i.v.' 4.:i4n 4.J71 4.-':)i) l.SW 4 , 1 t:i 4. 1171 4,()ti:t 4. II 15 4,(MV) nH';in V. V, Curv. N'cloritv l.'.KiJ \VI Wt ■y> 1 1 mi I .014 \vi wi + S7 0: '.Kill '.III ■ .". ,«! v.r Wt 25 I 1 :f0.7 \ ■Jl S ;iiio 1 2<.hr, 1 ■-•'.Ml 1 ■2S 1I1-4 i KM -Si 7.S .5 J - I'J J- 'i-J.W - .■) 41 + ly.i + Sl'iO .-,2 1 1 .■|l-2 47 11 4,H,'it) Vil. Wt .1.1 -.5 1 .■,10 1 .-,oo 1 + 4S 1 + .Vt :ll - 2.S-4!! ■17 - -JH + 21 t 4 ii'.Mi ; i:!l s i mil lj:!.s 14S-.'-, 13H-H V.I. Wt r2.-,-."i IIKI s l.'VI II i:i4ll 1 :!.■> ■ 2 121-2 HHi S + r2'.iii»; ~ 2!i 2:i f (HI .■) + Mill 111- 71 4 \ f s,s . 4 . S.-,ti I I , H.')!) \',1. \Vl ( l:i2 2 i:iii-2 7ii :ts 2'.i:t7 2S 4fi 4 121 2 120 II 122 7 i:ill \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.