The 130 - 280 metre wide asteroid 2014 MD6 will make a close pass (29.1 lunar distances, 0.0748 AU), travelling at 7.18 km/second, to the Earth-Moon system on the 31st July 2014 @ 03:54 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).