The STS-128 Space Shuttle Discovery had departed the ISS and was leading it by about 4 minutes. The Discovery is to the left and the ISS is the line to the right. Those are not double stars. When the Discovery faded in the east I placed the lens cap over the lens to keep from blowing out the photo with too much light while waiting for the ISS to come into view in the west. I forgot that the world does not stop and wait as well, thus two short star trails instead of one longer one.