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In my 30 sec exposures (27th May) the asteroid trail was the hypotenuse of a triangle, with sides 30 pix and 50 pix, giving a trail length of approx. 58 pixels.
This works out at 1.93 pixels per second.
At an image scale of 0.364 arcsecs/pixel, the movement is then approx. 0.7 arcsec/pixel which ties in the value reported by The Sky X Pro.
Cheers
Dennis
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