The 33 - 75 metre wide asteroid 2018 KD1 will make a close pass (36.1 lunar distances, 0.09294 AU), travelling at 5.52 km/second, to the Earth on the 30th May 2018 @ 21:53 UT ±00:05.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).