It was a challenging shoot. September 10th was practically the last day of Comet Nishimura's morning visibility, with only a half-hour window for imaging before dawn—20 minutes of which were ruined by clouds. At just 5 degrees above the horizon, instead of stars, you get their spectral characteristics. On top of that, I messed up the flats (don't ask). All in all, I spent about a month figuring out how and from which angle to process this. The stars had to be replaced using resynthesis in Siril; the rest came out something like this...
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