White egg/Tic Tac

The object was observed moving southeast while directly overhead my position listed above. It was moving at a speed of roughly 60-100mph and was around 200-300 meters high. The size of the object was roughly 20-36 feet long and 10-15 feet wide. It made no audible sound and had no lights but was clearly visible due to its white color contrasting with the dark gray clouds that were in the sky that night. Myself and another witness observed the object for around 60 seconds as it came from our peripheral vision and into full view, then it continued to move southeast in a straight line from our position at a steady pace throughout the sighting.