I have a satellite receiver with a built-in hard-drive (like a TiVo) which has immaculate frame by frame advance and I have watched this closely.
I don't know optics and/or camera terms, but what you are seeing is a diamond shaped artifact probably caused by a combo of the ccd chip and lens at extreme zoom trying to resolve a bright spot 200,000 feet away.
The lower darker half is just a (larger) ghost of the brighter top half.