[Add observation]

Observation 1
Feature(s)	Ganymede Io Europa
Filter(s)	ch4
Date	2018-09-05 09:32:06
Julian day	2458366.8972222223
System I	333.18237°
System II	98.55104°
System III	354.7567°
Illumination	99.299995%
Phase angle	9.800000190734863°
Solar longitude	317.0°
Eq. diameter	34.39″
Derotation	10.0 min