\ ( 26 ON TWO CELESTIAL BODIEs. 



April 22. In viewing Pallas, I cannot, with the atmoft 

 attention, and under the moft favourable prefent circum- 

 stances, perceive any (harp termination which might denote 



Pallas Is not a a difk ; it is rather what I would call a nucleus. 



difk^but a nu- Aprll 2g> Jn the finde ^ p aHas is Iefs than Cere ^ ^ . g 



alfo rather lefs than when I firft faw it. 



Of the Appearances of the nciv Stars, zvith regard to an Atmo- 

 fphere, or Coma. 



Ceres hasmoft April 21. I viewed Ceres for nearly an hour together. 

 J?J!? nt JLt C °" There was a hazinefs about it, refembling a faint coma, 



ma (perhaps . 



effected by the which was, however, eaiily to be diftinguifhed from the body. 



inftrument, or A jj 22> j fa the di(k of Ceres better defined, and fmaller 



more probably ■ 



by the atmo- than I did laft night. There does not feem to be any coma ; 



Cphere.) anc { j am inclined to afcribe the appearance of laft night to a 



deception, as I now and then, with long attention, faw it 



without; at which times it was always bell defined, and 



fmalleft. 



April 28. Ceres is furrounded with a ilrong hazinefs. 

 Power 550. 



With 5 1 6f, which is a better glafs, the breadth of the coma 

 beyond the difk may amount to the extent of a diameter of 

 the dills:, which is not very fharply defined. Were the whole 

 coma and fiar taken together, they would be at lead: three 

 times as large as my meafure of the ftar. The coma is very 

 denfe near the nucleus ; but lofes itfelf pretty abruptly on the 

 outfide, though a gradual diminution is ftill very perceptible. 



April 30. Ceres has a vifible, but very fmall coma about it. 

 This cannot be feen with low powers ; as the whole of it to- 

 gether is not large enough, unlefs much magnified, to make 

 up a vifible quantity. 



May I. The diameter of the coma of Ceres, is about 5 

 times as large as the ditk, or extends nearly 2 diameters be- 

 yond it. 



13 h 19'. 20-feet refle&or ; power 477. The ditk of Ceres 

 is much better defined than that of Pallas. The coma about 

 it is confiderable, but not quite fo extended as that of Pallas. 



May 2. 13 h 20'. Ceres is belter defined than I have gene- 

 rally feen it. Its difk is ftrongly marked ; and, when I fee 

 it beft, the hazinefs about it hardly exceeds that of the fiarsof 

 an equal fize. 



Memorandum. 



