The 6 - 14 metre wide asteroid 2015 KK120 will make a close pass (24.3 LD, 0.0623 AU) travelling at 3.19 km/second, to the Earth-Moon system on the 31st May 2015 @ 14:04 UT ±02:16.
See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).