At 8:40pm i was walking from my parking spot to my condo. as i came around the building i saw a very bright red-orange light moving slowly in the east traveling north to south. it was moving similar in both speed and altitude as a plane on approach to lambert international, but the airport is the other direction and i never see them travel this vector nor anything creating a ball of light this size and color. i watched for about 90 seconds as it moved steadily along and then flickered twice and completely disappeared. it was still light enough to be able to see the fuselage of a small plane farther south, so i have no idea where this went.