360 Royal Astronomical Society. 



IX. Elliptical Elements of De Vice's Cornet^ with an Epherateris. 

 By J. R. Hind, Esq. 



" These elliptical elements of the new comet discovered at Rome 

 on August 22, have been computed from an observation made at 

 Cambridge on September 15, one at Greenwich on October 3, and 

 a third at Mr. Bishop's Observatory, in the Regent's Park, on Oc- 

 tober 22. The last position was obtained by comparison of the 

 Qoraet with a star in Prof. Santini's Catalogue, employing a wire 

 micrometer. The observations were corrected for aberration and 

 parallax, and the resulting elements are as follows : — 



Epoch, 1844, Sept. 15*55896, mean time at Greenwich. 

 Mean anomaly = 2° 22' 25"-53. 



O / // 



qr . . . 342 32 40'1 "1 Apparent equinox, 

 ft .. . 63 52 241 J October 0. 

 I . . . 2 54 27-14 

 > = sin-ie. . . 37 59 5965 



Log. semi-axis major 0*4893706 



Log. mean daily sidereal motion in seconds 2"8159507 



Period of sidereal revolution 1980 days. 



Motion direct. 



" An ephemeris computed from the above elements is given in the 

 Monthly Notices. 



" The following constants are adapted to this ellipse, and may be 

 used for further calculation, 



a: = [0-481 36001 sin (E+ 7°6 3 34)-l-810161 

 ^ = [0-3543699] sin (E + 339 39 41) + 0483894 

 z — [0 0292555J sin (E +331 32 ^4) + 0-313834 



where E is the comet's eccentric anomaly. 



" It is to be remarked, that this comet is in some parts of the 

 orbit liable to considerable perturbations from Jupiter's influence." 

 Mr. Bishop's Observatory, Regent's Park, J. R, Hind. 



November 7, 1844. 



X. Observations of De Vico's Comet, made at Ashurst by R. Sno\r, 

 Esq. 



The observations extend from September 24 to October 7. The 

 right ascensions and declinations of the comet are given as deduced 

 from the instrumental readings without any correction. In some 

 instances, when the comet was immediately compared with a star, 

 the position of the star is similarly given. On October 2, the in- 

 strumental right ascension and declination of fl Ceti are also given ; 

 but, in general, the corrected positions of the comet cannot be de- 

 termined till the stars of comparison have been observed on the me- 

 ridian, and their positions furnished. 



XI. Observations of Altitude and Azimuth of the Great Comet of 

 1843, made at St. Helena. By G. Brand, Esq. 



The observations were made with an altitude and azimuth instru- 

 ment by Gilbert, and they extend from March 6 to March 23. On 

 March 6, the comet was compared with the moon only ; on every 



