Jupiter and Moons

It was a clear night and I was trying to get a shot of Jupiter and the Moon close together, but that didn't turn out so well. So I zoomed in to Jupiter as much as possible, and set it to a long exposure, and to my surprise, I found some moons!

This is actually two shots in one, as Jupiter was too bright in one, and the moons were too dark in the other.

I'm not sure which moon is which, but they are Ganymede, Europa, Callisto, and Io.