Right in the middle Vega and Arcturus was a bright circular light that looked like a planet but disappeared after only 20 minutes.This even took place August 6, 2016, at around 9:30 PM, just before dusk turned into night in Boise, Idaho. It was a beautiful evening, and there wasn’t a cloud in the sky. Mars and Saturn were visible in the southwest skies, along with Jupiter in the west, just below and to the right, of the crescent moon. Vega and Arcturus were barely visible and directly above of us. Right in the middle of those two stars was what I thought was Venus. My wife was nearby and I showed her what I thought was a cool looking planet. That’s how bright this circle in the dusk sky was and it looked like it was reflecting back the Suns light just like Venus does. She told me, “Go get your phone and use your Sky app and see if it’s Venus for sure.” I observed this for about 10-15 minutes and the object was STATIONARY the entire time and it appeared to be in outer space and not in our atmosphere. I went inside and got my phone and when I came back outside and looked up the object was gone! Naturally! So in any event, I still fired up my Google Sky app pointed it up where the object was and that’s when I found out that Venus was on the horizon in the western sky and I just couldn’t see it because the tree tops were obstructing the view. I’m VERY certain this wasn’t an unusually bright star that only appeared in the sky for about 20 minutes. If this was a satellite, then it was as big or bigger than the ISS (which I have seen dozens of times flying overhead west to east) and it had some form of exotic propulsion system, or maybe the solar arrays changed location and were no longer reflecting back the light, rendering the object invisible, I don’t know. This being my 4th UFO sighting tripped me out big time because i! f this was some type of UFO then it was absolutely gigantic, like maybe a huge mother ship. I just hope someone else also noticed this anomaly. I have looked in the same spot for the past couple of nights around the same and the object has never reappeared.