The 200 - 450 metre wide asteroid 2001 LB will make a close pass (28.4 lunar distances, 0.0729 AU), travelling at 11.56 km/second, to the Earth-Moon system on the 7th June, 2012 @ 17:00 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).