Nice shot. Stunning tail!
I agree that the object you mention looks like an asteroid. I wouldn't know if it's that or some type of satellite. It's movement looks to be almost completely in declination, as it's RA drift looks only very slightly onger than the star trails. Declination movement suggests to me it wouldn't be geostat, but polar orbiting satellite maybe but then I'd expect it to be moving faster, so probably a asteroid I suppose?
