The 17 - 37 metre wide asteroid 2013 RQ5 will make a close pass (4.8 lunar distances, 0.0123 AU), travelling at 22.75 km/second, to the Earth-Moon system on the 6th September, 2013 @ 06:40 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).