The 56 - 120 metre wide asteroid 2004 RO111 will make a close pass (58.2 lunar distances, 0.14963 AU), travelling at 5.97 km/second, to the Earth on the 19th May 2018 @ 04:28 UT ±1 day 01:35.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).