slow moving orb of light over Grand Junction

I am a night shift custodian, and I was standing outside the office after checkout, chatting with two of my coworkers.  As we were talking I looked up at the sky, which was cloudless and had no other obstructions to my field of vision.  
As I'm looking I see a very slow moving orb of light barely moving.  I live in a high air traffic area, so I'm very used to seeing airplanes.  This was definitely not one, as it had no flashing indicator lights, and was far too slow.  
My coworkers all looked to see what had caught my attention.  We looked at each other briefly, as if making sure none of us were crazy, then looked back.  
The orb had vanished.  We only looked at each other for roughly 2-3 seconds, and based off of rate of travel, there is no way it could have escaped our field of vision.  
I have heard two other confirmed reports, one from a friend, who I never shared my story with, and the other is a complete stranger, who caught it on film.