The 450 - 1000 metre wide asteroid 2001 JW2 will make a close pass (40.4 lunar distances, 0.1037 au), travelling at 13.22 km/second, to the Earth-Moon system on the 28th October, 2012 @ 11:47 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).