Any clues to this?

Image start time: 22:43 UT
Image end time: 22:51 UT

Dave,
Firstly, ice image!
Secondly, considering the time you took this, and considering the area that the image of M51 would cover, I would rule out satellites. Their lines should be bolder, as there would still have been "daylight" for them to have made a much stronger impression. But this is just my own theory. Do you think it could be gremlins in your camera?

Seanie.

Folks - I just went through the images again and I now have a strong suspicion these are artefacts, probably in the CCD. The two points show up in the same location in each image - the DSI software confused me because it stacks 'on the fly' so the artefacts trail. But when you blink them, they are in exactly the same spot in each image. I checked my dark frames but I don’t see any hotspots. I also checked some other images I took tonight but they're hardly comparable anyhow.

I think I'll put this one down to experience... :oops:

Best excitement I've had in ages since the Toffees got into Europe though

Dave McD

dave,
if you look at the zoomed in image of the 3 lines above i think that you might be right. unless my eyes are fooling me if you look closely at the right most and brigthest object there is a faint spot that appears to be rotating around the main object i think. if the software is doing self stacking it could be that they are rotating with the field of rotation. in the image, as for the toffees, getting excited once in a hundred years i'd have thought you'd be used to that now .
stephen.