I’ll have to revise this processing, because of a slight green tint in the shadows and an excess of denoise and deconvolution, but I’m glad I set an ambitious target on this easy galaxy that is not so easy with my equipment and sky. The moon was full and brighter than usual, because of a close perigee, so it was time to experiment. This image is the sum of 162 5-minute frames at ISO400. That amounts to 12 hours! At least I was able to finally tame the thermal noise that has always bothered me to no end.
NGC2403 is an intermediate spiral galaxy. That means something in between a barred and an unbarred spiral galaxy. It belongs to the M81 group and is about eight million light-years away.
Here’s the full field: