The 400 - 900 metre wide asteroid 2013 XM24 will make a close pass (44.0 lunar distances, 0.1131 AU), travelling at 22.34 km/second, to the Earth-Moon system on the 29th June 2014 @ 06:58 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).