The 51 - 110 metre wide asteroid 2017 WW27 will make a close pass (75.5 lunar distances, 0.19424 AU), travelling at 15.70 km/second, to the Earth on the 14th May 2018 @ 01:08 UT ±02:31.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).