The 14 - 30 metre wide asteroid 2014 KF22 will make a close pass (2.7 lunar distances, 0.0068 AU), travelling at 10.68 km/second, to the Earth-Moon system on the 28th May 2014 @ 14:28 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).