I just looked at the animation Dennis, what an absolute cracker.
I don't think Mag 18.7 is at your mag limit for this exp time looking at that.
Have you tried .Gif-ing negative images? I find they show much fainter images.
I tried for Sycorax (Mag20.7) of Uranus last night but focus and faint haze beat me.
Did get 3 asteroids in the frame 'though.
Have you done NEA's?
Well done and keep at it.
