The 150 - 340 metre wide asteroid 2014 NE63 will make a close pass (38.6 lunar distances, 0.0993 AU), travelling at 6.94 km/second, to the Earth-Moon system on the 15th September 2014 @ 18:45 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).