Hey again! I stacked 50% of my 7500 shots of andromeda from multiple nights (no calibration shots) and wanted to see how things fared. It’s a nice result, except for the fact that I can’t plate solve it because of this interesting artifact. See the following FIT file for what I’m talking about:
And this screenshot for a quick peek at what I’m referring to, in every bright star:
Has anyone seen this before? I’m unsure what could have caused it, except for maybe some concept of the stacking results (average with rejection, winsorized sigma clipping, 3/3 low/high) leading to those channels overflowing or underflowing? I just can’t see that.