[Add observation]

Observation 1
Feature(s)	Oval BA Ganymede
Filter(s)	ir
Date	2018-04-22 14:56:48
Julian day	2458231.1222222224
System I	300.44°
System II	21.68°
System III	241.85°
Illumination	100.0%
Phase angle	3.4000000953674316°
Solar longitude	306.5°
Eq. diameter	44.23″
Derotation	5.0 min