Re: #APCC - V1.9 Tracking Error #APCC
I believe its not a flex problem as its very consistent.It's good that it is consistent, but it is possible that it is unmodeled flexure. The pointing terms best model a solid object with consistent flexure characteristics. When you have a large mirror on one end of the scope the flexure can be uneven as a whole across the scope.
That's what the dec-arc tracking is supposed to handle but the path that the hour-angle point creation strategy takes can introduce random flexures that are not there when doing a declination arc.