[Add observation]

Observation 1
Feature(s)	Io Io shadow
Filter(s)	rgb
Date	2021-08-21 22:08:00
Julian day	2459448.422222222
System I	33.318977°
System II	186.58238°
System III	10.527687°
Illumination	100.0%
Phase angle	0.30000001192092896°
Solar longitude	46.8°
Eq. diameter	49.06″
Derotation	30.0 min