The 440 - 970 metre wide asteroid 2013 PW6 will make a close pass (70.2 lunar distances, 0.1803 AU), travelling at 26.52 km/second, to the Earth-Moon system on the 9th September, 2013 @ 01:56 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).