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there is a repeating RA pattern at the 230 sec worm fundamental, which suggests to me that the guiding is too slow to correct for rapid slope transitions in the PE. With 4 second exposures, mount response time and aggressiveness/hysteresis, your tracking loop is trying to (partially) correct for errors that happened maybe 8 or more seconds ago, which will mean that it could even be correcting in the wrong direction if the PE slope changes quickly. Have you tried guiding with short exposures - maybe 1 second - to speed up the guide loop? Also, do you have any raw PE data?
Last edited by Shiraz; 19-10-2014 at 08:03 AM.
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