The 130 - 300 metre wide asteroid 2014 NC39 will make a close pass (71.5 lunar distances, 0.1838 AU), travelling at 7.02 km/second, to the Earth-Moon system on the 19th August 2014 @ 10:30 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).