The 180 - 390 metre wide asteroid 2013 RH74 will make a close pass (20.5 lunar distances, 0.0526 AU), travelling at 12.26 km/second, to the Earth-Moon system on the 17th October, 2013 @ 08:26 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).