AAPOD2 Image Archives

2023, December 2023 Charles Lillo 2023, December 2023 Charles Lillo

The Left Arm of Cepheus (287 hrs)

This area of Cepheus doesn't get a lot of attention. There's no Elephant Trunk nebula, no Bat or Squid nebula, no Wizard nebula, no Iris Nebula. So naturally, I wanted to take some time and get a really deep integration on it, to try for a unique view.

Maybe the most interesting thing in this photo is the small blue blob of Oiii (with a sharp Ha/Sii arc) that's about 20% over from the left side of the image, and about a third of the way up from the bottom. At some point during data acquisition, the Oiii just started showing up. I thought it was dust in my imaging train, but after re-taking my flats, the Oiii was still there. Jaša Rebula was able to figure out that the area had been cataloged as supernova remnant Te 12….

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