A missile would NOT be that long and high when viewed from that far away.  Unless it was an ICBM... The size of the white object could be determined by viewing it at .24.  It fills the distance in the foreground from the beige barrier to the right of the frame.  Determine the distance to the impact site and you can then calculate the size of the object.  It IS NOT a missile...a missile would barely even be viewable from that distance...if at all.