With astrometry.net, I plate-solved all the Vulpecula double star images from the evening sessions on
Thu 18 Jun and
Fri 19 Jun. Consistent pixel scale numbers. But, as I suspected, the camera moved on Friday night, 2 degrees near the beginning, and 1 more degree half-way. Dang. I am still planning to analyse the drift images I took but I think I won't be able to use them.
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