Jupiter's moon Io is on the left hand side, just starting to transit the disk; the dark spot is Io's shadow. The famous Great Red Spot, a monstrous storm, is visble lower right on Jupiter.
Philips SPC 900NC webcam,Meade ED Apo 127mm telescope A webcam was used to take a video clip that was then divided into frames which were registered, stacked and processed using Registax4 software.
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