I believe it is impossible to get a visual sighting of something that small at that height. There are thousands of objects in orbit around our earth. A bag of groceries at 300 miles up would take more seeing ability than a human set of eyes can provide.

Pssst, Jim: You saw the ISS just the same way I saw AO-51. Neither of us saw the bird without it being illuminated by another source for us.

Clint Bradford