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Try this,
since the comet is doing most of the moving.
Make your exposures duration as low as possible so that it does not streak.
The stars should also be points if your are guiding. Then take as many image as your can as the comet cross the centre of your fov.
If you can the register al your images on the stars, you will have only the comet moving. Then try to make the a registered image on the comet position. I use imagej to process my images, can do a region of interest selection that can be aligned to a first frame location. Works for me.
And visa versa , if you can set your guiding speed to match the comet movement, once you have it centred . The comet data should be good, and then who cares about the star data...8).
Kind regards, Alan.
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