I think the object could be about a kilometer long and 150 kilometers high and would appear about this way. Assuming that it is a rock in orbit and not something stranger.
I don’t think this would be dirt on the lens because it changes orientation. I don’t feel the need to give a definite explanation until we have more data.—>Sherlock Holmes — “It is a capital mistake to theorize before one has data.”
Astrobiology Associates 