A few hours with the crab

Hi all,
I made it out last night to some imagine and ended up shooting M1.
This is a total of 180 minutes.Nine twenty minute subs.
I also discovered that since last time I imaged it appears something is on my chip.Anybody have any idea what this may be?It shows up in darks as well. You will see it on the bottom left of the image
Tec 140, St2000xcm at F7

Attached Image:

Jason,
Great image!

Weird artifact. Its really hard to explain that one. And its in the Darks as well... And if it's in the darks, why doesn't it subtract out...

Is there a possibility there is a light leak in your camera? I think the ST2000 has an internal shutter for darks, right?

There ought to be a site somewhere to post weird imaging artifacts - particularly after they have been explained. I bet there are some real doosies out there.

Nice shot Jason.