What is your guide exposure time?
I am wondering if you’re guiding a bit too aggressively? The RA looks like it is over compensating and chasing itself.
Hi
Am with Colin on this. At 100% aggressiveness you are bouncing around. In good seeing it should be no more than 50 to 70 %. If you focus just on RA, you can see from the graph that you are over correcting.
The intent is to make as few corrections as possible so you need to drop your aggressiveness. Also worth upping your guide exposure settings unless you managed to sneak in AO as part of your sponsorship?
If I don't dither, my graph is FLAT - all night. If I dither, i get weird spikes (out to about 0.5 arc sec) , but still round stars (actually, tighter than NOT dithering )
I was wondering what others might get with a cgem. Mine isn't too far off that but yours looks better than mine.
What exposure time are you using ? I'm finding about 1 sec is best for mine. If I go much shorter it gets very bouncy bouncy. If I go out to 2secs or more it's terrible!!
I'm using an asi290 with a 50mm WO guidescope with 200mm focal length.