I really enjoy doing these super dim targets that look like nothing in the individual subframes and only really pop once you get 10, or 20 hours on them.
This one is interesting because I did some of the imaging at 1x1 binning on the ASI294 but most of it was 2x2 (I was doing some experiments with binning). Overall I have about 400 six minute subs across Ha, Oii, and Siii for a total of about 40 hours of imaging. This is also from my backyard in Pasadena, CA.
Regarding the target, I could not find a lot of details about this, but did find a source of info here:
http://www.arizonanightskies.com/lbn-576.html.
“LBN 576 (also known as Abell 85 and CTB 1) is a faint supernova remnant lying almost 10,000 light years away. Coincidentally, it is also around 10,000 years old. Until recently it was thought to be a planetary nebula but recent studies confirm it to be a supernova remnant, the closest one known to Earth. Supernova remnants result from the explosion of a star in a supernova and are bounded by an expanding shock wave. They consist of ejected material expanding from that explosion. Also appeared on “Starship Asterisk,” the main discussion venue for the Astronomy Picture of the Day (APOD) October, 2014.”
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