The 15 - 35 metre wide asteroid 2014 JD will make a close pass (7.7 lunar distances, 0.0197 AU), travelling at 10.46 km/second, to the Earth-Moon system on the 9th May 2014 @ 23:49 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).