The 1000 metre wide asteroid 1998 ML14 will make a close pass (21.9 lunar distances, 0.0563 AU), travelling at 10.36 km/second, to the Earth-Moon system on the 24th August, 2013 @ 10:43 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).