Repost of green spot, last post didn’t work

Can anyone tell me what this is? Or just a camera artifact?

Possibly an asteroid, or supernova? If you look at the single-exposure images, it exists in only “CCD r 604779 N27”. There’s no entry in the JPL horizons database.

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Very cool. I was thinking it had to be weird, don’t think I’ve run across one in the past.