I few nights ago I was able to capture about six hours of good data on the Crescent Nebula, in the constellation Cygnus. This image was captured using my Sky-Watcher Esprit 100 f/5.5 apo refractor on an iOptron GEM45 mount with a ZWO ASI533MC Pro one-shot color camera and an Optolong L-Extreme dual-band filter. The image was constructed from 119 3-minute subs plus calibration frames, processed in PixInsight, Affinity Photo, and Denoise AI. A false/pseudo-Hubble color palette was used in processing.
I love all the nebulosity that’s present in this image. One of the challenges of processing this image was to reduce the impact of what is otherwise a pretty intense field of stars. PixInsight provides the Morphology process and also makes use of StarNet++ to help reduce the stars a bit. It doesn’t look much like a crescent to me, though–more like a brain, or as someone else suggested, a cosmic gallstone. Has kind of an eerie look to it, doesn’t it?