Abell 82 is at the very end of the list of popular astroimaging targets. This planetary nebula has apparent size similar to size of well known M57 Ring nebula, but Abell 82 is much, much fainter object. Distance to this nebula is estimated to 1,000 light years. It is not well examined object. According to https://www.aanda.org/articles/aa/full_html/2011/02/aa13984-09/T4.html page, its central star is supergiant of spectral typ K0. But this kind of star would not be able to excite surrounding nebula to shine in Ha and Oiii wavelengths – it requires more UV light. K0 type star also could not born planetary nebula, because when PN is created, central star rejects its outer shell and become white dwarf, and K0 supergiant still contains these outer part. It is possible, that this K0 supergiant is a binary star with companion of white dwarf – planetary nebula origin. Abell 82 itself is located in Cassiopeia – close to NGC7789 Caroline’s Rose open cluster.
Both transparency and seeing were moderate during the nights when I captured subframes to this image. Maybe it was not the best idea to picture such small object under such conditions. But I just wanted to check how this Abell 82 looks like under my suburban sky. And once I checked first frame, I decided to continue. Or I was to lazy to change target 😉
Image technical data: Date: 30.09, 05.10.2018 Location: Nieborowice, Poland Telescope: Meade ACF 10" Corrector: AP CCDT67 Camera: QHY163M, gain 100 Mount: SW EQ6 Guiding: SW 80/400 + ASI290MM Exposure: RGB 35:25:30 x 30 seconds, Ha 95 x 300 seconds, Oiii 45x300 seconds Conditions: seeing average, transparency average