The 42 - 94 metre wide asteroid 2018 JJ2 will make a close pass (20.4 lunar distances, 0.05261 AU), travelling at 7.55 km/second, to the Earth on the 30th May 2018 @ 23:32 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).