Hello,
I recently started to use Scheduler for all my acquisitions, even single targets.
In Scheduler/Ekos/Alignment settings I have "Reset pipeline if verified image delta exceeds" enabled and set to either 0.5' or 1'.
I find this thing very useful.

My guiding is reasonably good at around 0.5" total. Without any bias in any direction..
Yet, the target drifts away beyond the delta quite often - every 5 to 20 min.

I wonder why...
Any idea?

Thanks!

The answer to your question is usually flexure. That is, the pointing of the guiding telescope and the imaging telescope bending slightly away from each other. To quite John Hayes, "at one arcsecond everything is made of rubber". That was the reason I created this feature in the first place, because I was suspecting that in my system.

In the end, the usual solution is a off-axis guider or an on-axis guider.

Hy

Ah... Makes sense.
Thanks!