Jupiter with the shadow of Io, one of its moons crossing the planet. This was taken at 8:53PM PDT. Note the change in moon positon in the next image which was taken 10 min later.

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 - 1.5 mom video at 30fps.
Processing - converted to avi format in AVS Editor, extracted, graded, aligned and combined frames in Images Plus. Used 500 best of 2748 total frames. Sharpened in photoshop.