The 30 metre wide asteroid 1998 KY26 will make a close pass (45.6 lunar distances, 0.1171 AU), travelling at 7.76 km/second, to the Earth-Moon system on the 6th September, 2013 @ 03:38 UT ±00:08.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).