The 68 - 150 metre wide asteroid 2005 SQ9 will make a close pass (35.3 lunar distances, 0.0908 AU), travelling at 10.42 km/second, to the Earth-Moon system on the 11th May, 2012 @ 07:21 UT ± 2 days_09:19.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).