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" I am about 90% certain that it is something in my optics." sounds better than "I looked at some similar Hubble images of the region and this object does show up so it is not a processing artefact but it is indeed a real object."
I searched for hundreds Nasa and ESO photos of keyhole nebula, and I did not find any similar.
"Failing that maybe I just found my first UFO" or it is happenning something there, now. It worth to check. Why not ? The majority of images was obtained one decade ago. The ring is very strong to be not percepted easely.
Despite of all, the image is very good, Chris. Again, congratulations.
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