I have had similar problems in the past with Jupiter. Both Gary & I reckon it was something to do with stacking, & registax not getting a good "register" point..
When we had a lunar shadow on the image the stacking seemed to work heaps better as you could register on the shadow.
I don't know if this is the problem here, but's it's something to think about. Wait a couple of months and then Jupiter will be much more socialble.
Cheers
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