The 91 - 200 metre wide asteroid 2018 KL1 will make a close pass (33.4 lunar distances, 0.08601 AU), travelling at 13.82 km/second, to the Earth on the 31st May 2018 @ 14:50 UT ±00:01.
See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).