Quote:
Originally Posted by lhansen
I checked the tpoint model numbers and the dec values range from 0 to 90 + and -.
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Lars, this is key and I would need you to clarify it further.
When you examine the column for the Dec values of where the scope
appears to be pointing, do any values appear whose absolute values (i.e.
ignore the +/- sign) are in the range 90 to 180?
The column for the Dec values of the star that you sampled will
always have absolute values in the range 0 to 90 but those for the mount
need to also supply information to TPoint that the OTA was flipped.
If you can attach the data I can have a quick look.
Quote:
I also looked at the error vectors and there is a strange pattern - Measurements made with the scope on the east side of the pier, looking west have error vectors that point due west, with the reverse pattern being evident on the west side of the pier. I interpret that as either, my pier could be rocking? I can check that - or the mount is not properly attached to forks of the mount base.
Any thoughts?
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As mentioned in my previous post, some classical error terms such as CH
reverse their vector direction when the mount is flipped, so the pattern
you saw is not strange but in fact normal.
It is typical to achieve a small RMS when you begin sampling just on
one side of the meridian, but as soon as you do a flip see the RMS values
go out the door until you sample some more.
But it is key that whatever automation you have in place that is
conveying the mount's position to TPoint is also able to denote
which side of the meridian the data was sampled on.
If not, you can be chasing your tail.