PHD2 stability improvement after SGP dither


#1

I had an issue where about 1 in about every 15 sub exposures would not guide well and oscillate a few arc seconds (RA or DEC). I was using PHD2 and dithering / pausing between exposures. It only occurred immediately after the dither and would continue for the full sub exposure. The next exposure, or a stop/start would fix the issue immediately. (Paramount MX, SGP, Pulseguide or ST4, any guiding algorithm)

I posted my issue and log files in the PHD2 forum and the development team compared what occured after a stop/start with pause and dithering. They did a brilliant job and introduced the same reset into the guiding variables after a dither. I have been evaluating a trial version which has performed consistently for 50 subs. The code should be making it into the next PHD2 release and make the PHD2/SGP combination even better.


#2

Buzz,

Thanks for posting that.

If anyone else wants to try it, the changes Buzz is referring to are available in PHD2 v2.4.0rc1 (PHD2 2.4.0 release candidate build).

Andy


www.mainsequencesoftware.com