Posted by David Mottershead at 11:53 on 2011 Jan 22
Thanks Andrea. Dr John Rogers (Director Jupiter section) also wonders whether I might have observed a satellite shadow (Io) as around the time I saw the dark spot on Jupiter Io was casting a shadow onto the surface (18:18 19-01-2011). If it was the shadow of Io, then that’s a first for me as I’ve never seen one of Jupiters moons shadows before.