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Hi Rob
Here is a screen capture from The Sky X Professional showing which (known) minor planets were in that region at the date/time.
It looks like there were 2 in the field, at Mag 18.5 and 19.6 respectively and it looks like they would have been almost stationary for the duration of your exposure (200 secs).
So, I’m guessing that either a satellite or maybe an aeroplane may have left the trail judging by its length? Generally, only a (fast moving) minor planet classified as a Near Earth Object would leave such a trail for such a relatively short exposure.
Cheers
Dennis
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