The 12 - 27 metre wide asteroid 2014 JN25 will make a close pass (17.6 lunar distances, 0.0453 AU), travelling at 5.29 km/second, to the Earth-Moon system on the 18th May 2014 @ 18:47 UT ±00:06.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).