The 790 - 1800 metre wide asteroid 2003 KU2 will make a close pass (40.2 lunar distances, 0.1034 AU), travelling at 17.12 km/second, to the Earth-Moon system on the 15th July, 2012 @ 08:59 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).