Witnessed an object with 3 lights forming an equilateral triangle on its bottom plane that hovered and made no noise.

Two friends and myself were on our way to Mason City, IL from Lincoln, IL via IL Route 10.  About 2 miles before New Holland, we noticed an object hoving approximately 150 yards up in the sky.  It wad 3 lights that formed and equilateral triangle on the bottom plane.  We turned north off of Route 10 onto a rural county road.  I stopped the car and the 3 of us exited the car to observe the object.  Just as we exited, the object slowly "floated" towards us at a slow pace.  It made no noise, which was intriguing.  The object stopped roughly above us (at the same estimated height of 150 yards).  We watched the object for approximately 10 minutes, and then it just "floated" away just as it had approached.