[Add observation]

Observation 1
Feature(s)	GRS Io
Filter(s)	rgb
Date	2020-08-25 21:04:24
Julian day	2459087.3777777776
System I	269.84503°
System II	297.94547°
System III	25.778994°
Illumination	99.5%
Phase angle	7.900000095367432°
Solar longitude	15.4°
Eq. diameter	45.07″
Derotation	35.0 min