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I had that same effect when Io was right near the limb. Mine wasn't quite as close to the limb as yours but I noticed the same thing.
I'm sure it's something to do with the contrast - when it's on the planet the contrast is low, but when it's near the limb the contrast is higher.
I don't think it's entirely a processing artifact though, because I saw it appear brighter during the raw capture run.
Good question!
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