Quote:
Originally Posted by gregbradley
I haven't really made a big model yet. The biggest has been about 20 points or less. It was pointing fairly accurately after a couple of points. Object about 1/8th away from centre of the screen image.
I don't see it vary from night to night. I thought that did not change once you powered down and powered up.
I find go-tos are usually an indication of PA error mostly. How good is your polar alignment?
I found drift aligning using the CCD every night for 30 minutes and tweaking it slightly to improve it a bit more over several nights paid dividends.
Greg.
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PA is pretty good, the rate of drift is about 0.2 arc seconds/minute, so it's many minutes before it's noticeable. TPoint is esimating it in the range of 0.3' - 0.5' from the pole in each direction.
Go To accuracy per se is very good - the offset is repeatable, an offset for all goto's. For example the first and all objects will be off by the same amount and direction as every other subsequent object. I can move anywhere in the sky and have the object centered almost exactly where the last object was on the chip (within about 10 pixels of the last object).
I'm only just starting to learn the stuff I need to in order to get this working smoothly, so think I'll work at refining things like the initial synchronise, pc clock, more points in the TPoint model (currently 120) and so on.