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That is Io you have there. You might like to get Jupiter 2 as a program that tells you about moons and GRS information.
The blurry edges are onion rings. They are compression rings caused by the camera not being able to download all the available grey scale. Many cheaper webcams suffer from this problem. To minimise the problem use the histogram to expose your planet at near full histogram. You will not completely remove it but it will look better than this. Which camera are you using?
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