I caught Mercury on 10-21 at almost 15 degrees. The atmosphere was still pretty jumpy although seeing wasn't too bad higher up... It's at f/29 using my DMK. I was surprised how bright it was.
That's a good question Mike. I messed around with it a little more but it's really hard for me to identify a good way to ensure they are aligned properly.
looks though theres some detail on the surface, it would be interesting to compare to an official surface terain map to see just how much detail you actually have.