The 14 - 31 metre wide asteroid 2014 JW55 will make a close pass (4.3 Lunar Distances, 0.0112 AU), travelling at 15.56 km/s, to the Earth-Moon system on the 13th May 2014 @ 17:04 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).