I noticed what I thought was the ISS going over head, but was unaware of any fly over for my location. I watched it as it went by and continued to be illuminated when viewing from behind. For commercial aircraft usually lighted appearance stops after the aircraft passes. This object stayed illuminated about the same after passing my location. There was no sound that I noticed and the object was over 1 mile in altitude. It appeared while I was looking up toward the west and was headed in a east direction.