The 400 - 890 metre wide asteroid 2014 MC6 will make a close pass (75.0 lunar distances, 0.1928 AU), travelling at 13.44 km/second, to the Earth-Moon system on the 6th August 2014 @ 12:52 UT ±00:07.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).