The 100 - 230 metre wide asteroid 2003 SU84 will make a close pass (52.9 lunar distances, 0.1358 AU), travelling at 13.20 km/second, to the Earth-Moon system on the 5th September 2014 @ 16:38 UT ±14:01.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).