The 25 - 56 metre wide asteroid 2006 BC8 will make a close pass (61.6 lunar distances, 0.1584 AU), travelling at 17.71 km/second, to the Earth-Moon system on the 16th July, 2012 @ 17:27 UT ±1 day 02:50.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).