The 160 - 350 metre wide asteroid 2008 WJ60 will make a close pass (63.5 lunar distances, 0.1631 AU), travelling at 9.11 km/second, to the Earth-Moon system on the 8th December, 2012 @ 13:05 UT ±05:13.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).