The 130 - 280 metre wide asteroid 2018 JK3 will make a close pass (19.5 lunar distances, 0.05031 AU), travelling at 21.77 km/second, to the Earth on the 27th May 2018 @ 18:53 UT ±00:01.
See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).