The 220 - 500 metre wide asteroid 2003 BQ35 will make a close pass (61.7 lunar distances, 0.1585 AU), travelling at 4.64 km/second, to the Earth-Moon system on the 28th August, 2012 @ 06:35 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).