900GTO and STV Average Tracking Errors


Feb 12 10:14 PM

 


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#11935 Feb 12 10:14 PM

Several nights ago, I was tracking Comet Machholz and noticed the

STV was reporting "instantaneous" -X (i.e. RA adjustments) values of

4-8" while the +X values were 2" or less. The STV was configured

for 8 second exposures since the comet is approaching 5.0

magnitude. I had polar aligned with a polar scope only. Keep in

mind these are values while tracking the comet. Does the 2-4 time

larger adjustments in the -X axis indicate a balance problem? I

also had a 10-20 mph SE wind which may have added to this peculiar

behavior. Later, I imaged Orion with the STV tracking a star. The

-X values dropped to 2-4" while the +X values were 0.4-1.2". I'm

quite sure I had balanced everything fairly well, especially the RA

axis since it's the easiest to balance. I was using my FSQ-106N,

Pentax 67, and STV. It makes me wonder if the combination of the

wind and the downward swing of the "gear tooth" added up to the

errors I was seeing in the -X axis. Finally, I was standing in

front of the mount and camera in trying to shield it from the wind.

Any suggestions or comments would be greatly appreciated. Are these

values common during breezy conditions? I noticed the stars were

blinking to with probably average seeing around 2-3". As a side

note, with no wind, I usually get X values averaging around 1" or

less while polar aligned with the polar scope.



Thanks in advance,



Wade



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