nucdoc

Wow, just wow!

Excellent, nice colour balance

Nice, the core is well maintained and not blown out

I would also say it looks like PA.  I see this when I image planets, for planetary imaging I use a secondary mount in my back yard, it is set up with simple alignment with a polar scope, I do not spend time doing drift etc, as this is not needed when I use a video camera shooting hundreds of frames over only 60 seconds.  During the exposure the planet slowly drifts, and eventually I have to put it back in the centre after I have shot several 1 minute data sets. Looks just like what you are showing

Mark

I also had a look at your data, and agree with the others here that your subs are fine, and they integrate with no problem.  For this exercise I used PI just to make sure that the images would align and stack properly.

I see that you solved the problem, so congrats.