The Gateway to Astronaut Photography updates with new images from the ISS almost daily, at a rate of a couple hundred a day. This is an interesting oops...http://eol.jsc.nasa.gov/scripts/sseop/p ... 654442.tsv
Now I would have never noticed this had it not been for the following picture...http://eol.jsc.nasa.gov/scripts/sseop/p ... 654442.tsv
...which, as you can see is overexposed.
I should point out that the order in which I looked at them are reversed because I look at the latest image posted and work my way back. So the overexposed image actually was taken first.
So, whatever it is...it's not a lens flare. Next I used the negative of both images to show the movement of the object...