Royal AstroJiomical Society. 63 



x= [9-98351] . r . sin (358 55 9 + v) 

 ?/= [9-50659 J . r . sin (144 52 34 + v) 

 z = [9-99340] . r . sin (86 5 25 + v). 



Mr. Cooper's observation on August 31 gave the follo-wIng 

 position : — 



Greenwich M.T. R.A Dec. 



August 31-46583 2° 54' 2-0" +55° 37' 7-3" 



De Vico's Sixth Comet {September 23, 1846). 



This faint telescopic comet was discovered by Father De Vico, in 

 the constellation Ursa Major. M. lliimker has reobserved the stars 

 of comparison, and computed the following places from the original 

 observations : — 



Rome M.T. R.A. Dec. 



h m 8 o I II o I II 



1846. Sept. 23, 8 6 36-5 128 2144-5 +64 14 234 



10 25 34-9 128 48 295 +64 14 185 



M. Wichmann rediscovered this comet at Kdnigsberg. 



Konigsberg M.T. R.A. Dec. 



h m 8 o I II o I II 



1846. Oct. 15. 8 39 19 187 33 51 +44 30 23-3 



16. 7 45 11 188 36 239 +43 29 6-2 



The following observations were made at Altona and Hamburg : — 



AltonaM.T. R.A. Dec. No. of 



li m 6 o I II o I II Obs. 



1846. Oct. 21. 6 42 197 193 11 40 +38 20 46 



Hamburg M.T. 



21. 7 5 18-2 193 12 46-1 38 19 47-3 2 



22. 16 20 50-1 194 17 34 3 36 57 52-6 12 



The elements, as computed by M. Powalky at Altona, and by M. 

 Niebour at Hamburg, prove the identity of the comet of Wichmann 

 with De Vico's Sixth Comet. 



Elements of the Sixth Comet of De Vico (September 23, 1846), 

 by Mr. Hind. 



Tlie following orbit depends on the observations at Rome, Sep- 

 tember 23 ; Konigsberg, October 15 ; and Altona and Hamburg, 

 October 21. All the small corrections taken into account. 



Time of Perihelion Passage, 1846, Oct. 29-74708, Greenwich Mean Time. 



Longitude of Pcriiielion 98 .^^ 49-9 \ True Equinox, 



Longitude of Ascending Node 4 41 3-7/ 1846, Nov. 0. 



Inclination 49 41 17"1 



Log. distance in Perihelion 9-9193956 



Motion direct. 



The co-ordinate constants for the uj)parent equinox at the begin- 

 ning of November, are, — 



