The 20 - 45 metre wide asteroid 2015 KD23 will make a close pass (40.3 LD, 0.1035 AU) travelling at 4.97 km/second, to the Earth-Moon system on the 18th June 2015 @ 10:02 UT ±00:28.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).