The 460 - 1000 metre wide asteroid 2002 OD20 will make a close pass (15.1 lunar distances, 0.0388 AU), travelling at 10.18 km/second, to the Earth-Moon system on the 23rd May, 2013 @ 13:59 UT ±00:01.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).