Circle next to Cluster
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I saw A similar image...I think it is the remnant of a supernova.
There appears to be some nebulosity associated with the bright cluster. I could only see the ghost in B&W.
That can happen when one of the frames has a synthetic cluster in it.
Same frame, different object name AAP0000d45
Nice -- I totally missed it in the color image.
#ghost easily seen in b/w