[PRejto (Peter)]

OK, while I "endlessly" trouble shoot I noticed that my PEC wasn't working as well as it has since last May. I've not changed anything on the mount, or even removed it from the pier. I don't even recall removing the scope.

I used Pempro to redo the PEC curve. The first thing that stands out is that my peak to peak uncorrected error has increased from 2.6 arcsec in May (Red curve) to 4 arcsec (green curve). The two curves are both similar and different. Currently the new curve works better than the old curve, but perhaps not quite as well as the old curve worked back in May when I measure .4 arcsec after correction. Currently the best I can get is .9

I feel pretty confident about the data as they both used 7-9 worm cycles of data at 0 degrees on the meridian at .65 (green) -.75 (red) arcsec resolution.

Is it usual for PEC curves to just change over time? Could it be an indication that the mount needs lubrication? Something else, or should I forget about this and just accept that it's working now?

Thanks,

Peter