The 590 - 1300 metre wide asteroid 2001 SO73 will make a close pass (73.2 lunar distances, 0.1880 AU), travelling at 19.57 km/second, to the Earth-Moon system on the 30th July, 2013 @ 13:35 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).