The 100 - 230 metre wide asteroid 2000 UY33 will make a close pass (58.0 lunar distances, 0.1490 AU), travelling at 13.08 km/second, to the Earth-Moon system on the 27th April, 2013 @ 22:05 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).