The 210 - 470 metre wide asteroid 2013 WR44 will make a close pass (50.6 LD, 0.1301 AU) travelling at 20.65 km/second, to the Earth-Moon system on the 26th May 2015 @ 02:28 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).