Jupiter with the shadow of Io, one of its moons crossing the planet. This image was taken at 9:03PM PDT - 10 min later than the previous image and the moon position has changed noticibly.

Details-

Sept 10, 2009 at Victoria Centre Observatory
Conditions - clear, 16deg C, with moderately poor seeing.Equipment - 14 in, SCT with modified Canon T1i and 2.5x Powermate at prime focus.
Exposure - 6m video at 30fps.
Processing - converted to avi format in AVS Editor, extracted, graded, aligned and combined frames in Images Plus. Used 1000 best frames of 10857 total frames.Sharpened in photoshop.