Io crosses Jupiter April 28, 2006
Note Great Red Spot 'Junior' a little below, and to the left of the Great Red Spot
Animation (starts after 5 sec.)
(In the last few frames, the moon is visible a little behind its shadow.)
20 frames, each from best 300 of 750 AVI frames
Animation of best 8 frames showing red spot "junior" following Great Red Spot