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I don't know what is going on with your image Michael. It is
incredibly noisy for ISO 800. Was the ambient temp high at
the time of acquisition? When enlarged, the stars can be seen
to be strangely coloured, aquamarine and bright pink. If the
individual frames are all good there shouldn't be any stacking
artefacts to remove. It is not a difficult object to photograph,
except that it is a bit small. I suggest that you forget Startools
and PS for now, and do all the basic processing in DSS, it has a
fairly comprehensive user guide in the help tab.
raymo
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