Incoming: The Earth-Moon system has company tonight. The Asteroid: Near Earth Asteroid 2010 WC9 is back. Discovered by the Catalina Sky Survey outside Tucson, Arizona on November 30th, 2010, 2010 WC9 was lost after a brief 10 day observation window, and was not recovered until earlier this month. About 71 meters in size, 2010 WC9 is one of the largest asteroids to pass us closer than the Earth-Moon distance.