The 14 - 32 metre wide asteroid 2013 BZ45 will make a close pass (1.9 lunar distances, 0.0048 AU), travelling at 7.14 km/second, to the Earth-Moon system on the 3rd February, 2014 @ 15:36 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).