The 35 - 78 metre wide asteroid 2015 KW56 will make a close pass (51.1 LD, 0.1314 AU) travelling at 4.46 km/second, to the Earth-Moon system on the 19th June 2015 @ 20:23 UT ±1 day 10:47.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).