The 400 - 890 metre wide asteroid 1994 XD will make a close pass (20.2 lunar distances, 0.0518 AU), travelling at 20.03 km/second, to the Earth-Moon system on the 27th November, 2012 @ 12:19 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).