The 180 - 400 metre wide asteroid 2014 OY337 will make a close pass (70.2 lunar distances, 0.1804 AU), travelling at 12.30 km/second, to the Earth-Moon system on the 10th August 2014 @ 00:00 UT ±00:02.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).