a group of galaxies in the constellations Ursa Major and Camelopardalis, including galaxies Messier 81 (Bode's Galaxy) and Messier 82 (Cigar Galaxy) and interstellar dust

Probably my most agonizing astrophotography to date. I collected signal for last year's hour-long session on the "leftover" time from shooting other objects this winter during the remaining dark time, trying to align the field on the stars based on last year's data. It resulted in 3 separate sessions of 1.5-2 hours per night. Due to the limitations of my equipment and tracker, I set exposures at 30 seconds, so I ended up with a lot of frames - almost 1000 together with last year's session. I couldn't manage to stack such a quantity in PixInsight; it required 2.5 TB of free disk space and used all the RAM, and in the end, it still gave some error and wouldn't build the final stack. After the 4th attempt (each taking over a day to process), I had almost given up and wanted to abandon the whole thing, but decided to try a different approach. I stacked the individual sessions from each night separately and then stacked those stacks into one, and "oh, miracle!" it finally worked! But by then, I had no mental energy left to process the result :)) I only returned to it just now, after 2 months. Let it be like this for now, maybe I'll redo it later, or better yet, reshoot it :))