The 73 - 160 metre wide asteroid 2015 KE57 will make a close pass (76.4 LD, 0.1964 AU) travelling at 9.26 km/second, to the Earth-Moon system on the 4th June 2015 @ 15:51 UT ±00:32.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).