I am using a trial version of SGP (version 184.108.40.206). I cannot seem to get SGP to recal my AP mount via centering with a plate solver. Two nights in row now the mount has “taken off” during an attempt at centering.
I used the AP driver to reach the approximate location of M 104. The mount read RA = 12 40 01, Dec = -11 37 35. I started SGP, loaded my M 104C sequence, and used frame and focus to take one 10-sec image. Before starting SGP I focused the telescope using focus max, so stars were sharp and easily visible. I right-clicked on the SGP image and selected plate solve, giving my first guess as the actual coordinates of M 104 (RA 12 39 59.2, Dec -11 37 23), and scale 1.67. My local version of Astrometry.net plate solver worked quickly and accurately, showing that the center of my frame was actually RA = 12 43 03, Dec = -11 23 32. Note: M 104 was nowhere to be seen in this frame!
Next I went to target settings and entered M104’s actual coordinates (see above) and clicked the center now button. SGP went into its centering mode, taking an image and saying that the frame was off thousands of pixels in each dimension. It then attempted a move (I think) and took another image (I think). Same result - thousands of pixels off. On its third attempt the mount took off. Two nights ago I aborted immediately. Last night I let it go to see where it was headed. Weights swung vertical, then past vertical a bit, then reversed direction for a second (all RA motion). This looks scary with the telescope near the floor! Then Dec took off, unfortunately in the wrong direction - the scope was going to hit the pier. So I aborted, got out of SGP, and saved the log file.
Can you tell me what’s going wrong? Driver error on my part? After the abort, mount coordinates were way off, apparently reset incorrectly by SGP.