UFO Sighting in Missoula, Montana on April 30th 2015 – Flew across the sjy, emitted light, then just disappeared

I was walking home from work at about midnight. Saw an object in the sky, kinda orangish heading South. At first, I thought shooting star but it was going too slow. Then it suddenly stopped after passing by me, flared out w/ blue/green light the just vanished. It hovered before vanishing for about 5 seconds while I watched it.