The 320 - 710 metre wide asteroid 2002 QZ6 will make a close pass (72.2 lunar distances, 0.1856 AU), travelling at 14.06 km/second, to the Earth-Moon system on the 24th August, 2013 @ 20:26 UT ± 11:35.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).