2011 BT15 (also written 2011 BT15) is a near-Earth asteroid and potentially hazardous object. In 2013 it had the 5th highest impact threat on the Palermo Technical Impact Hazard Scale. It was discovered on 24 January 2011 by Pan-STARRS at an apparent magnitude of 22 using a 1.8-meter (71 in) Ritchey–Chrétien telescope. It has an estimated diameter of 150 meters (490 ft).
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