Hovering craft with blinking lights of different colors, no sound, then vanished

I was in my backyard at about 1:45 AM with my dog and I always look up at the stars to find certain constellations, the moon, shooting stars, etc. This time I noticed what I first assumed was a helicopter hovering in the western sky. But it was much higher up than helicopters usually are and seemed too big to be a helicopter and there was no sound coming from it. I could not really tell the shape of the craft because it was dark out. I could only see the lights, some of which were blinking. There were at least 3 lights, white, blue and red which made me think it was a law enforcement helicopter but again, too big and too high. I watched it for about 30 seconds to a minute and then turned to go back inside my house, then looked back and it was gone. I had looked away for exactly 5 seconds because I have a trail camera set up on my patio to take 10 second videos of wildlife triggered by a motion detector and it captured videos of me and my dog while we were in the yard. So I can see exactly how long it was from when I looked away to when I looked back and couldn't see the object anymore. I don't know if flew off at a high rate of speed or simply turned off its lights.
If I had to guess at the shape of the object I would say it looked cylindrical like the body of a large commercial jet without the wings. I can only go by the lights which were at different heights and beside each other which suggests the craft had width and height. It was too far away to judge the depth so it could have been disc shaped. The lights did not shift with regards to each other so they were all in fixed position on a single object.
From where I was standing in my backyard the object was in the western sky above the hill known as Glassford Hill but I really don't know if it was directly over the hill or farther west over Prescott.
I don't know how long it was there before I noticed it, but I only watched it for about a minute, then looked away for 5 seconds, then looked back and it was gone. It was clear night sky and I could see all the usual stars and constellations, no clouds.
I do recall hearing a brief distant roar that I thought was a jet of some sort but it was too brief and did not coincide with the sighting of the object. But I remember that sound puzzled me as well and I just thought I would mention it. I don't know if it had anything to do with this object or not. My memory of the sound is not as clear as the craft sighting memory. I believe I heard the roar a bit before noticing the object.