On the hunt for novel Oiii emission nebulae, I ran into some interesting characters in the constellation Carina. I noticed this seemingly faint smudge of Oiii in a wide angle image, and performed a follow up observation with the FSQ85. This follow-up revealed quite an exciting structure! With my rudimentary catalog searching skills, I believed this to be new.
@Marcel Drechsler followed up on my behalf, confirming that it may in fact be new, but recommending we give Robert Fesen a try at it.
Robert with some effort determined that this structure happened to be already known, cited in this paper from 1995:
https://arxiv.org/ftp/arxiv/papers/0807/0807.5004.pdfThe authors of the paper leave their radio data as the figure for this object (not the most visually inspiring thing I've seen in my life):
So while not a discovery, still I thought it would be cool to grab the first-ever optical image of the SNR. It definitely needs more data, but I'm in search of greener pastures!
BTW I'm taking the opportunity to give this object a colloquial name, "The Blue Crescent Nebula". This is because it looks like a copy paste of the crecent nebula, but just in [Oiii]:
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