October 2ndNova in M31
I took 4 images of M31 looking for novae.
Unfortunately this one was discovered 2 hours 17 minutes before my image.
A wider view showing the location:
Asteroid 2015 TB145This was discovered on 10th October and passed by the Earth at 1.27 lunar distances on October 2015.
The asteroid was forecast to be at magnitude 10, but was very hard to spot on images.
Perhaps its location at low altitude in the North West was a factor.
A negative full frame shows the trace more clearly:
(60 second exposure)
A 20 second image showed a tumbling object, perhaps space junk.
Calsky did not report any objects in this area.