I shot some video which may be more illustrative. I was so jumpy that it was incredibly difficult to get anything useful from it. I took several video passes, then PIPP'ed and Registacked them, then got the final output image from different videos and put them in a GIF. The final Gif consists of three frames pulled from two different video passes. My scope does not track, so it would have traced a different path through the optics each time. Click on the GIF to see a larger version in a new window. The feature is about one third along the terminator from the left limb.
With the movement, you can see something that seems to remain constant, even in spite of the boiling and warping of the shape of the planet itself.
I'm open to the idea that this might be something else, but I'm not sure what it could be - also curious if there is in fact detail to be seen on mercury at all - I haven't heard of it before). If I get the opportunity I'll have another go tonight.
Cheers
Markus
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