The 36 - 80 metre wide asteroid 2014 OG300 will make a close pass (21.4 lunar distances, 0.0549 AU), travelling at 12.15 km/second, to the Earth-Moon system on the 16th August 2014 @ 08:59 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).