The 31 - 69 metre wide asteroid 2015 HS1 will make a close pass (27.2 LD, 0.0698 AU) travelling at 7.46 km/second, to the Earth-Moon system on the 13th May 2015 @ 17:43 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).