The 67 - 150 metre wide asteroid 2007 YN56 will make a close pass (53.4 LD, 0.1373 AU) travelling at 9.37 km/second, to the Earth-Moon system on the 22nd June 2015 @ 03:22 UT ±1 day 03:53.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).