The 530 - 1200 metre wide asteroid 2000 GU127 will make a close pass (41.3 lunar distances, 0.1061 AU), travelling at 22.60 km/second, to the Earth-Moon system on the 1st November, 2012 @ 01:42 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).