Lately I have been exposing 900s subs and over in Ha. I also improved my calibration routine so now when I stack I can see a lot more things and details including all those pesky slow moving things like asteroids. What's the best way of removing them? I'm using Sigma reject 2% with 2 iterations max. Works well for fast flying objects leaving a clear trail but I've got problems getting rid of the slow moving ones that would translate maybe 5-10 pixels over an hour or so. That ends up as a dotted lines in my stack. And there's a lot of them too.
Thanks for any tips.