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I don't think it's a UFO, too slow? It took the object from 1018 to 0218 to disappear from the screen, that's 16 hours.
I think it's a lens reflection, a perfect circle.
Not a craft but you can apply the term "energy field" of you want.
A clocked craft, some kind of energy field ?
The term is actually coronal cavity.
edit on 4/4/2014 by Phage because: (no reason given)