The 440 - 990 metre wide asteroid 1999 JV3 will make a close pass (55.5 lunar distances, 0.1425 AU), travelling at 13.64 km/second, to the Earth-Moon system on the 4th June, 2013 @ 21:52 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).