The 50 - 110 metre wide asteroid 2015 JZ1 will make a close pass (17.3 LD, 0.0444 AU) travelling at 17.42 km/second, to the Earth-Moon system on the 30th May 2015 @ 06:41 UT ±00:01.
See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).