The 29 - 65 metre wide asteroid 2008 YQ2 will make a close pass (41.1 lunar distances, 0.1057 AU), travelling at 15.60 km/second, to the Earth-Moon system on the 3rd July, 2012 @ 11:28 UT ±13:38.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).