The 9 - 20 metre wide asteroid 2014 RJ11 will make a close pass (3.0 lunar distances, 0.0076 AU), travelling at 7.43 km/second, to the Earth-Moon system on the 8th September 2014 @ 21:54 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).