Brightness of the Satellites of Jupiter. 341 
22 h 58' 4". Appearances as before. 
October 15, 1796. 2 i h 23' 42". 10-feet reflector; power 600. 
The 2d satellite is uncommonly bright; its apparent magni- 
tude is also larger than usual. 
The 4th satellite is very faint; it is not brighter than the 
belt, but is of a bluish, ruddy colour. 
The apparent magnitude of the 2d satellite, after long look- 
ing, is very nearly equal to that of the 1st ; but at first sight it 
seems to be larger, owing to its superior brightness. 
The apparent diameter of the 2d satellite is certainly larger 
than that of the 4th. 
23 h 35' 42". The light of the 1st satellite, compared to that 
of the 2d, is considerably increased since the last observation. 
It is now nearly as bright as the 2d. 
October 16, 179b. o h 23' 49". 10-feet reflector; power 600. 
The 1st, 2d, and 3d satellites of Jupiter seem all considerably 
bright. 
The 3d is much larger than the 1st, and the 1st a little larger 
than the 2d. 
The intensity of the light seems to be pretty equal in all the 
three ; that of the 2d, however, is perhaps a little stronger than 
that of the 1st; for, notwithstanding its apparent less diameter, 
it seems to make as strong an impression as the 1st. 
October 25, 179b. 2i h 44' 48". 10-feet reflector; power boo. 
The 1st satellite of Jupiter, compared to the 3d, is small. 
The 3d satellite is bright and large. 
The 2d is brighter than the 1st. Compared to its usual bright- 
ness and magnitude, it is very bright and small. 
The 1st satellite, compared to its usual brightness and mag- 
nitude, is faint and small. 
Yy 2 
