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Seb
The colour is (lateral) chromatic aberation. It's from some optical element in the photon path. If you look at the opposite edge of Jupiter you'll see the blues partner colour: yellow. Blue-yellow and red-green fringing are the two common types, RAW converters usually have a feature in them to correct for it. There should be options or plugins to help remove it in non-RAW image formats (I've only used it when loading RAW images).
It should be very obvious on the bright edge of the moon, so might be worth doing some test shots swapping in/out anything you can that has a lens element in it to try to find which ones are causing the problem. You can also do this during the day by shooting something fine and in shadow backlit against a bright sky. Shooting bare tree branches against a bright sky is where its very noticable (or a TV antenna), where you have lots of solid "black" (underexposed) fine lines against a white "overexposed" sky. The colour fringing stands out strong and its an easy way to take shots through whatever optics you have to see which items give you the cleanest image and which are the worst offenders. Camera lenses or telescopes its all just optics and any element in the optical path to the sensor could be at fault.
Silly question, but how are you getting any usable images with this camera? Have you found Windows drivers or a registry hack that unlocks the auto exposure?
Maybe the auto exposure "stabilises" if you have a tracking mount (which I don't have) but I haven't been able to find any way to disable the auto exposure (there is always a tick in the box next to exposure that can't be unticked and the slider doesn't do anything as a result...its the only setting thats not fully manual). Even imaging the moon is useless for me currently with the drivers supplied on disc, so I've uninstalled to everything to be able to get the Toucam running again.
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