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Strange tracking in RA on PMX
while guiding for my latest images i noticed a clear issue which resulted in egg shaped stars. i have attached an image of the tracking plot and you can see the issue. the line that is being traced is in line with the RA axis. i have run PEC and re run it (i will do it again with PEMPRO3 tonight) and it still has the issue. everything is solidly connected, no matter what part of the sky and what guiding settings i have, the issue is consistently in the RA axis. The 2 possibilities i have come to are
1) the use of a CW extension bar might be introducing flex and causing a pendulum effect. but would it be this severe? (the error is around 7 arc seconds)
2) does the gear need to be greased. i assume that if the gears are not running smoothly it could cause an issue like this but that is an assumption.
i am open to any other suggestions or trouble shooting recommendations. i am keen to solve this issue because if i can, it looks like i can get some really good images, if the tracking in Dec is anything to go by.
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