Delta shaped craft seen over UMO (1988?) Oct 15 - very quiet and still to slow moving

When I first saw this there was not many posts for this type of siting and I let it go except for one post I made to some Purdue researcher that I never heard back from.  However, this is what happened. I was coming back from the computer lab at UMO and noticed a light over the trees as I passed in front of the gym.  Anyway it struck me as odd and I pulled into the parking lot on the ball fields side and looked at it. I realized that it was on my way home about over by the dairy farm.  So, I got back in my car and went like I was going to the dairy farm and while on the way I could occassionally see the glow of the light ( bright white ). As I got closer I saw the source of the light was hovering over the edge of the field.  As I turned into the road that went to the farm I almost immediately pulled over and stopped and got out of the car.  I looked at the clock and it was nearly 8 pm. I looked up at the craft and some things that struck me were the following: it sat as still as if it were on a stand somewhere between 300-1000 feet in the air.  It did not appear to be that big (about the size of a small school bus but wider. ) It appeared to be pretty flat and shaped like a shortened home plate (more delta shaped than rectangular). As I stood there I could no longer see the source of the light because I was a little under it and behind it (the light source on the object) .  I could see the glow of it though.  The next thing that struck me was the sound it made.  It was very quiet but it sounded kind of like a jet engine with the volume turned way down.  No other lights or sound was evident.  The night was still as could be. I watched it for perhaps 5 minutes and at that point it headed towards Route 2 going to Bangor.  As it got close to Brewer I lost site of it because the road was under construction and I could not get into town quick enough to get across the bridge. It never went very fast.  It was still for at least 10 minutes in the beginning and then I followed it for another 5-7 minutes as it followed the river.
We presume "UMO" stands for University of Maine at Orono (Maine).  Date of sighting is approximate.  PD