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Gooday Peter,
I think you will find that a bright star reflection is bouncing off the CCD chip and then reflected back off the CCD glass window and bouncing back onto the chip.
I get this with Alnitak and M45 bright stars as the attached crop shows.
Very annoying and not much that can be done about it. People say that by removing the glass window and re-installing it slighty tilted will fix the problem.
Regards
Bill
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