%92 ' PLACET JUNO, 



Sc fe fa atI ° n8 ° A The clIameter of tIlIs grille was ,02. It fubtended air angle 

 P ne J nno ' f 0^429, and was of fealing-wax ; had it been a iilver one, 

 it would have been ftill more vifible. 



With 879,4. All comparative magnitudes of the afteroid 

 and flars, remain as with 496,3. 



The minute double ftar q Ophiuchi * was feen in high per- 

 fection, which proves that the air is clear, and the telefcope 

 in good order. 



The afteroid being now in the meridian, and the air very 

 pure, the comparative diameter feems a little larger than that 

 of an equal ftar, and its light alfo differs from ftar-Iight. Its 

 apparent magnitude, however, can hardly be equal to that of 

 the fmalleft globule obferved this morning. This globule mea- 

 fured ,01353, and at the diftance of 9620,4 inches fubtended 

 an angle of 0",214. 



When the afteroid was viewed with 879,4, more hazinefs 

 was found than an equal ftar would have given : but this the 

 Bo6tor afcribes to want of light. What he calls an equal ftar, 

 is one that in an achromatic finder appears of equal light. 



Oct, 7. Mr. Harding's afteroid has continued its retrograde 

 motion. The weather is not clear enough to allow the ufe of 

 high powers. 



Oct, 8. If the appearance refembling the fpurious difks of 

 fmall ftars, which I fee with 410,5 in Mr. Harding's afteroid, 

 fhould be a real diameter, its quantity then by eftimation may 

 amount to about 0",3. This judgment is founded on the fa- 

 cility with which I can fee two globules often viewed for this 

 purpofe. 



The angle of the firft is 0",429, and of the other 0",214 ; 

 and the afteroid might be larger than the latter, but certainly 

 was not equal to the former. 



With 496,3, there is an ill-defined hazy appearance, but 

 nothing that may be called a difk vifible. When there is a 

 glimpfe of more condenfed light to be feen in the centre, it rs 

 fo fmall that it muft be Jefs than two-tenths of a fecond. 



To decide whether this apparent condenfed light was a real 

 or fpurious difk, he applied different limitations to the aperture 

 of the telefcope, but found that the light of the new ftar was 

 too feeble to permit the ufe of tbem. From this he concluded 



* See Cat. of double Stars, I. 87. 



that 



