The 330 - 750 metre wide asteroid 424482 (2008 DG5) will make a close pass (74.9 lunar distances, 0.19266 AU), travelling at 11.85 km/second, to the Earth on the 20th May 2018 @ 01:39 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).