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What am I seeing on Jupiter?

I am observing Jupiter at about 170x and can see a dark spot.Could this be a new hole in the cloud band or could it be the shadow of IO in transit?

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  • 1 decade ago
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    There was an Io transit between about 0300 and 0500 EDT on Sunday Aug 22. Since Jupiter is close to opposition, the shadow transit should have occurred at a similar time.

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