Thanks for all the comments guys.
Good adjustment Mike, was really rushed to finish processing and get to work!
Thanks Erick, yes the moons are Europa (top) & Ganymede (bottom).
Check out the JPL simulator:
http://space.jpl.nasa.gov/cgi-bin/ws...ite=1&showsc=1
I think the shadow is quite large and suspect it's actually Ganymede but could be wrong.
p.s. the image was taken at 17:50UTC not 18:50UTC as shown on my image.