Astrophotogaphy with a Digital Camera

I've been using a FinePix S7000 to make astronomic images from Topeka. Most of my images are of Jupiter and its four major satellites for an astronomy/physics lab I'd like to write (I hope to create an activity book of astronomy with this and other lab exercises). Last night, after photographing Jupiter, I used my planetarium program to identify the satellites in the image. I found out that the planet Uranus was just above Jupiter and upon checking my image, i realize I recorded the planet.

The picture was five seconds long with a zoom of six power (optical zoom, not digital). I'll keep photographing the planets to monitor the motions between them and the fixed stars.