The 110 - 240 metre wide asteroid 2013 RC32 will make a close pass (45.2 lunar distances, 0.1163 AU), travelling at 14.99 km/second, to the Earth-Moon system on the 19th September, 2013 @ 12:46 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).