The 46 - 100 metre wide asteroid 2014 MJ55 will make a close pass (28.9 lunar distances, 0.0744 AU), travelling at 13.75 km/second, to the Earth-Moon system on the 23rd July 2014 @ 12:26 UT ±00:11.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
