The 15 - 34 metre wide asteroid 2007 WJ3 will make a close pass (71.1 LD, 0.1827 AU) travelling at 16.98 km/second, to the Earth-Moon system on the 11th May 2015 @ 01:10 UT ±1 day 01:46.
See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).