Dr. Herschel’s Observations of the 
334 . 
OBSERVATIONS. 
A remarkable Conjunction of two Satellites of Jupiter. 
May 14, 1790. n h 30' 10"; correct sidereal time. The 2d 
and 3d satellites of Jupiter are so closely in conjunction, that 
with a 7-feet reflector, charged with a magnifying power of 
350, I cannot see a division between them. 
n h 34' 10". The shadow of the 1st satellite is still upon 
the disc of the planet. 
Intenseness of Light and Colour of the Satellites. 
July 19, 1794. i7 h i2 / 47". 7-feet reflector. The 1st satel- 
lite of Jupiter is of a very intense bright, white, shining light. 
It is brighter than the 2d or 4th. I speak only of the light, 
and not of the size. 
The colour of the 4th satellite is inclining to red. In bright- 
ness it is very nearly, but not quite equal to the 2d. I make 
no allowance for its being farther from the bright disc of 
Jupiter than the 2d. 
10-feet reflector, power 170. The 3d satellite is just gone 
upon the body; before it went on, it appeared to me to be 
smaller than usual. 
The 2d satellite is of a dull, ash-colour ; not in the extreme, 
but rather inclining to that tint. 
July 21,1794. i6 h 56' 45". 1 o-feet reflector ; power 170. 
The 3d satellite of Jupiter is round, large, and well defined. 
It is very bright, and its light is very white. 
The 4th satellite is also round, large, and well defined. I 
estimate its magnitude in proportion to that of the 3d satellite 
to be as 4 to 5. Its light is not white, but inclined to orange. 
