> I am using TPoint with my 8"LX200 on the Meade wedge and permanent pier.
> Upon doing a calibration run of 250 stars I end up with a pointing
> accuracy of RMS 72.29 arc min and a population std dev of 74.1 arc sec
> using 19 terms to describe the pointing algorithm. I would like to get a
> feel for the accuracy of other similar systems using TPoint (or other
> mechanical/software pointing systems). My second question is how long an
> exposure could I take without noticible field rotation if my polar
> alignment is out by 5.4 arc min below the pole and 10.3 min to the east of
> the pole (I'm using a FL of 1260mm and ST6)? Is it worth realigning the
> scope since TPoint corrects for position? Is there a quick formula?
>
> Thanks in advance
> Marc Castel
>
Hi Mark -- You might find some helpfull info on my TPointers page below.

BTW, 250 points sounds like much more than you really need. 35 - 50
will give you about the same results.

Best regards

Frank


Best regards,

Frank Loch

Try Deep Space 99 at http://home.early.com/~floch/index.html

TPoint & DEC Bearing Mod at http://home.early.com/~floch/observatory.htm

For Astro Art try: http://home.early.com/~floch/astrob.htm

For Gemstone information try: http://ourworld.compuserve.com/homepages/FLoch/

For exquisite Jewelry try http://www.lochsjewelers.com

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