Low-altitude disk flying slowly; red lights around perimeter.

I saw a disk fly directly over me at an altitude of about 50 ft. and a speed of about 10-20 mph, travelling from west to east.  It was about 10 ft. diameter, had a series of evenly spaced red lights around the perimeter, and made no sound.  The object made no changes in speed or direction during the time that I could see it.  I was around 9 at the time, and my memory of it is somewhat jumbled, but I am certain that this happened.  It was a quiet night, and the sky was overcast.  I thought at first that it was a helecopter, but it made no sound and was perfectly circular.  I think I saw a circle on the bottom of it, but otherwise it was dark.