Here is the full processed version. Note the sunward extension from the coma (the actual tail is not visible). I measured mag 0.3, but then its likely not all the coma is visible.
Scott, this was a tough processing challenge! I made 5 sets of 17 second exposures. I was able to acquire 17 exposures in well under a minute and so didn't need to register them (my drive is good enough to achieve this). The comet was easily visible on a 17 second stack. After ending up with 5 images (each consisting of 17 exposures) I was able to register on the comet and stack these to get the final image. Actually there were 18 frames in the 5th set so all up this is a 86 x 0.0008 second stack!
Also I do not have a goto drive and rely on manual setting circles, all adding to the challenge
.
The comet has been brightening very rapidly, it is a lot brighter than it was yesterday. Its not suprising you didn't succeed the other day.
Terry