This was part of the observing challenge for April -
Observe the major satellites of Jupiter and draw or photograph them then identify which each of them are. You can also follow this on consecutive nights and note (draw) how the positions of the Galilean Moons change from night to night
Below are perfect examples of the requirements for the challenge
Skully is currently writing his report which will be added shortly.
I believe that this is not the only part of the challenge he has undertaken. Keep an eye out for updates