317

I add an ephemeris of Iris for the ensuing niontb wliich

Nr. 668.

18 30 13192 7 24 1;l 16 37 4,29 20 31 2,67 7 24 59,3

E i g e n b e w e g u n g (lee S t e r n s 20 M a y e r i .

,4rgelander hat die Rewegung dieses Sterns, der in den pundamentis nicbt vorkommt, nur aus der Vergleichung seiner eignen und Flarnstced's Reobachtung hergeleitet: da er zu den stSrkstrn bewegten Steriien gehErt, so ist eine genauere Untersuchung nicht oline Intercsse, Ich stelle hier die s lmmt- lichen altern iirid neuern Beobachtungen zusaninien, urrd be- merke, d n h die Palernritarriecheo Reeultate a u s den jetzt ver-

iiffentlichten Originalbeobacbtungen Piazzi's und Cacciatore's abgeleitet sind. Die constaoten Di5erenzen habe icb nach meinen ,,I71itersuchungen liber die Fixsternsysterne" angesetzt, und das Gewicht einer Flanisteed'schen Beobachtung = A; eirier Mayer'schen = 3, einer Piazzi'scheo und Cacciatore- schen = $, eirier Riimker'schen = 4 uad einer der iibrigen Beobachter = 1 gcsetrt.

Auf 1850 reducirte AIL Decl. Fehler. - - -

Flamsteed 1706 I 10'5' 51"9 1 4-4'33' 14"O +1"9 +3"2 1756 I 6 43,l -5'6 2 32 20,9 - 4 " l +7,0 +2,2 1797 4 7 2,3 4-192 4 3 1 32,O -290 -0,9 +1,5 1806 3 7 10,4 +1,2 3 31 21,3 -290 -1,3 +0,9

Cacciatore 1824 5 7 22,l +i,2 5 31 1,5 -290 -3,2 +1,4 Argelandcr 1830 12 7 31,5 0 12 30 51,3 --097 +O,l -0,l iliy 1831(34)2 7 33,6 -077 2 30 46,3 -173 +0,7 -1,9 Taylor 1832 5 7 32,6 5 30 47,2 -0,4 -1,9

*?/y Pzazti

1812 6 7 14,3 +1,2 6 3 1 13,7 -290 -2,3 0,o

Riimker 1836 I 7 37,9 1 30 45,3 +1,6 +0,7 Challis 1837 3 7 38,3 -133 - --0,i Henderson 1837 4 7 36,8 +0,3 3 30 45,4 -076 0,o +i,6

Airy 1838 4 7 37,O +0,9 6 30 43,8 -094 0,o +1,2 ~ l m i s m i 1849 5 7 47,3 5 30 31,9 +0,4 +1,7

1838 4 7 38,6 + 0 , 3 4 30 12,9 -076 +l,O +O,i C/tnl/k 1838 6 7 38,8 - 1 9 3 - -0,4

Hesultat: 1850. 10' 7' 31Y36 +O"818 t + 4 30 28,91 -1 ,124t . Eine Bewegung voir IU389 in] Bogen des griirsten Kreises, untl m a r eine fast ganz durch die Sonnenbewegung zu er-

klarende, niaclit cine Parallaxe von wenigstens 0'1 sehr wahrscheinlich. PIadZer.

S c h r e i b e n d e s H e r r n Hind a n d e n Herausgeber . Mr. Bishop's Observatwy , Regents-Piirk, London 1849. March 27.

My dear S i r , H a v i n g been compelled to attend strictly to medical tlirec- tions for several months I have done little i n tlie way of cal- culation or observation arid must beg your kind itidulgence for the irregularity of my cnrrcspondence. I hope I shall now be able tn attend to work again.

I have to return you m y best thanks for the cnrrtinoation of your valuable journal. I notice in the last number an in- vestigation on the elements of Iris, from wliich it would ap- pear tbat in JdL and 1 think [da there is some error in m y results a s previously published. 1 suspected this was the m8e some time since bnt have been too unwell to examine the alculatinns.

It is calculated by Mr. Pogson and will be quite accurate enough for idcntifying the planet with certainty.

12h Grrenw. M. T. 1849

March31 April 2

4 6 8

10 12 14 16

ah/

AR. h i e . -- 9~~27"19a60

27 i3,69 27 14,45 27 21,71 27 35,38

28 21,15 28 52,99 29 30.64

27 55,21

d. h i p . 497 '8XA. P.

6 58 4,l i 4m528 4u79 7 3 4,9 7 7 35,0 15 17 4,66 7 I 1 36,O 7 15 5,9 15 43 4,53 7 18 5, l

' 7 20 34,O 16 9 4,41 7 22 32.7

-- - +6'52' 33" i

Nr. UB.

i2h Greenw. M. T. 1849 AR. Irir. d. Irir. 497'8XA y. ---- -

April 24 9~32"56'01 +7'25' 25#7 26 34 0,25 7 24 54,2 17"33' 4'06 28 35 9,30 7 23 53,8

Mag 2 37 41,OO 7 20 27,2 4 39 3,30 7 I8 1,9 18 32 3,86 6 40 29,71 7 15 9,3

30 36 22,95 7 22 24,7 18 2 3,95

8 9 42 0,07 4-7 I1 49,9 19 2 3,74

1 have calculated the following elements of the binary 21938 near pBootis from all the observations known to me

1 may also add the follorving orbit for AOphiucbi, wbich rvili he found very similar to that published by Prof. M&&w in his U n t e r e u c l i u n g e n i i b e r d i e F i x H t e r n - S y a t s m e I have supposed that Sir w. Heradel's angle of 1802 re- quires a correction of 180'.

Perihelion Passage ....... ,1791,214 Position at Perihelioti. ........ 177'50' Node............... ....... 30 23 lnclinatiori to plane of projection 49 40 Angle betweeii x ati fi on orbit 135 24 Excentricity ................. 0,4772 Semi -axis major. ............ 0%47 Period ..................... 95,88 years.

at the present time including several valuable measures taken I by Mr. Domes in 1847 and 1848.

I have uot compared these elements with the whole so- I riee of nieasures hu t a partial cunipariron of observed and

calculated angles induces me to place some cnnfideiice in the ...... I Perihelion Pasfiage.. .1851,75 Position at Perihelion. ........ .2 19' 0'

orbit. I Node.......................lO4 50 Inclination to plane of projection 58 2 Angle between w and fi ....... 103 22 Excentricity ................. 0,8775 Semi -maim axis ............. 3"08

1 1 can hardly understand W&'dZer's elements for rophiuchi. ~ The numbers appear to me to he something like the follow-.

Period o i Revolution ......... 458.65 years. i ing. I .

Periliclion Passage 1821,8, the angle = 106' Node about 48~30t, E~~~~~~~~~~~ o,575, Period years, The comparison with some of the most trustworthy measur1's I 1300,

l is very satisfactory. J. B. Hind.

1847 April 26

Oct. 19

- 20

1848 Juni 12

Moudsterne Leobachtet auf der Sternwnrte zu Gustau.

6. Sterneeit.

1Ih22' 31'88 I1 29 9,16 I 1 36 46,66 11 53 4,15

21 23 33,28 21 38 38,52 21 52 35,93

22 13 48,30 22 50 43,05 23 9 17,66

14 4 51,24 14 10 57,04 14 21 26,27 14 42 31,20 14 48 31,59

- s Leonis u Leonis Mondrand 1. x Virginis B Aquarii d Capricorni Mondrand I.

y Aquarii Mondrancl 1. y Piscium

virgini is hVirginis Mondrand 1. a' Lihrile € Librae

Herr Staatarath M & d h hat mir uoter dem 7'- April eine

G . Steroaeit. - 1848 Nov. 2 19"30' 5 1'1 3

20 12 30,05 20 20 13,20

- 5 21 38 40,91 21 58 15,81 22 I 1 6,57 22 22 38,67 22 44 43,58

Mondrand I. g Capricorni p Cepric dCapiic I Aqurrii Mondrarid I. u Aquarii h Aquarii

S t e r b e d e c k u n ge n. G. Sternreit.

1847 Dee. 20 Eintritt 2461 Tauri urn 23'49"55'12 1848 Febr.15 ,, 54 AGcmin. ,, 5 23 10,98

Mai 6 ,, XXXVI (vide Urait.) 12 6 8,88 - 7 2, XLIl ( - ) 12 38 27,87 v. Zobedtitz.

Antwort anf den Aufsatz des Herrn Dr. Peterr, , ,Ueber B e r r n Prof. McEdlers U n t e r s u c h u n g e n U.LI.W." (Nr. 661-663) gesandt, die eobald ee angeht ahgedruckt werden SOU.

S.

. -

Altona 1849. April 23.