The 20 - 45 metre wide asteroid 2006 HC will make a close pass (60.6 lunar distances, 0.1558 AU), travelling at 5.54 km/second, to the Earth-Moon system on the 1st May, 2013 @ 07:48 UT ±06:59.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).