Tags: Planet.
2008 AO112 (also written 2008 AO112) is a near-Earth asteroid and potentially hazardous object. It was discovered on 12 January 2008 by the Mount Lemmon Survey at an apparent magnitude of 21 using a 1.5-meter (59 in) reflecting telescope. The asteroid was quickly lost and had an estimated diameter of 310 meters (1020 ft). On 25 June 2009 with an observation arc of only 1 day in January 2008 the asteroid had a 1 in 4 million chance of impacting Earth on that very day.