The 170 - 380 metre wide asteroid 2006 XD2 will make a close pass (45.4 lunar distances, 0.1167 AU), travelling at 9.14 km/second, to the Earth-Moon system on the 1st June 2014 @ 20:22 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).