The 54 - 120 metre wide asteroid 2013 PH3 will make a close pass (37.4 lunar distances, 0.0960 AU), travelling at 5.67 km/second, to the Earth-Moon system on the 11th September, 2013 @ 15:19 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).