520 Royal Astronomical Society, 



The following expressions for the comet's co-ordinates enable its 

 geocentric positions to be more readily computed : — 



x = [0-50302] sin (e + 138 '5 32) — 1-10654 



y— [0-50843] sin (e + 55 35 24) — 1-38397 



z = [9-94451] sin (e + 74 56 1 1) — 0-44213 



e denoting the eccentric anomaly. 



The errors of the computed places for all the observations which 

 have reached me are as follows : — 



11. A. Declination. 



Nov. 22 Paris —303 -19 



Dec. 



The first observation of right ascension at Paris must be affected 

 with a considerable error. 



[An ephemeris of the comet for January and February 1844 is 

 here given in vol. vi. No. 3 of the Monthly Notices.] 



In several respects this comet is very remarkable ; and it may 

 afford room for speculation regarding its identity with the lost comet 

 of 1770. The orbit resembles more nearly the elliptical orbits of the 

 planets than those of the periodic comets yet known. In its aphe- 

 lion and perihelion it approaches nearly the orbits of Jupiter and 

 Mars ; and it must occasionally experience great perturbations from 

 the former. It also passes within comparatively small distances of 

 the orbits of the minor planets. 



I have to-day received Professor Schumacher's circular, dated the 

 5th instant, communicating Dr. Goldschmidt's elements, which are 

 nearly the same as mine. They may be considered as confirming 

 each other. 



I obtained an observation of the comet on December 25. Another 

 on December 20 is not yet reduced, the star of comparison being un- 

 determined. 



Mean time at Edinburgh. R.A. Declination, 



hms hms / /; 



Dec. 25 11 31 58 5 10 4*6 +3 1 42 



Edinburgh, January 10, 1844. 



V. A Letter from Professor Henderson announcing an additional 

 Observation of the Comet of Faye, for which we refer to the Monthly 

 Notices. 



VI. Elements of the Comet of Faye, computed by J. C. Adams, 

 Esq. of St. John's College, Cambridge. Communicated by Professor 

 Challis. 



The observations used were made with the Northumberland Tele- 



