[Add observation]

Observation 1
Feature(s)	Oval BA Ganymede Callisto
Filter(s)	ch4
Date	2021-06-26 16:26:00
Julian day	2459392.1847222224
System I	335.21768°
System II	197.69324°
System III	6.675373°
Illumination	99.299995%
Phase angle	9.800000190734863°
Solar longitude	41.8°
Eq. diameter	44.54″
Derotation	10.0 min