The 35 - 79 metre wide asteroid 2010 SE will make a close pass (28.5 lunar distances, 0.0732 AU), travelling at 13.16 km/second, to the Earth-Moon system on the 20th March, 2013 @ 16:43 UT ±12:52.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).