Quote:
Originally Posted by CDKPhil
The star I centred drifted about 50 arc seconds in RA over 40 minutes.
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Don't want to sidetrack Peter's thread, but...
Phil, if you have a large scope like I do then that's probably flexure. With an EdgeHD 14 on an ME I was getting about one arc second per minute of time drift in RA. It was flexure. Turning on ProTrack made it (appear to) stop. Quite impressive. Sounds like ProTrack is NOT working for you. That's not good.
It's not the number of pointing samples, it's the model. The pointing samples are the raw data that is used to compute the model. Once a model is in place, the pointing samples are not used. It's the model that is used. The better the model, the better ProTrack will work. Sometimes you can get good models without having to collect a large number of pointing samples. Sometimes you can't and just plain have to collect a bunch of pointing samples.
One of my favorite ways to graphically see what's going on with tracking is to set the Declination track rate in Telescope->Tools->Bisque TCS->Parameters so as to intentionally cause significant star trailing.