Thanks Steve - was a complete fluke, as most of these things are. It was taken at about 5.30am, only 20 mins before sunrise - I'd been imaging Jupiter and had just finished and decided to pack up but the moon was nearby so I moved over to it and grabbed a few runs including that one.
The scope was properly cooled, the moon was at the zenith and the pre-dawn air was very steady. Turned out to be a good combination :-)
regards, Anthony
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