The 78 - 170 metre wide asteroid 2014 HS124 will make a close pass (40.7 lunar distances, 0.1046 AU), travelling at 6.90 km/second, to the Earth-Moon system on the 18th May 2014 @ 02:40 UT ±00:08.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).