The 16 - 36 metre wide asteroid 2006 HX30 will make a close pass (10.9 LD, 0.0279 AU) travelling at 4.55 km/second, to the Earth-Moon system on the 16th May 2015 @ 15:49 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).