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17 February 2023 at 1:13 pm #615775
I’ve sometimes had issues with DSS that I’ve never understood…it’s not just you!
It could well be that the comet centroid is being biased by the nearby field star. DSS is not very clever and needs a well-defined comet movement between each frame to distinguish it from the background stars. Try stacking the first, last and middle frames of the series and see if that makes any difference.