The 290 - 640 metre wide asteroid 2006 CV will make a close pass (67.9 lunar distances, 0.1744 AU), travelling at 13.24 km/second, to the Earth-Moon system on the 20th August, 2012 @ 07:33 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).