The 37 - 84 metre wide asteroid 2015 HL171 will make a close pass (8.8 LD, 0.0227 AU) travelling at 15.47 km/second, to the Earth-Moon system on the 2nd May 2015 @ 05:56 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).