The 110 - 240 metre wide asteroid 1999 LK1 will make a close pass (13.2 lunar distances, 0.03402 AU), travelling at 10.03 km/second, to the Earth on the 15th May 2018 @ 02:38 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).