The 49 - 110 metre wide asteroid 2015 KM122 will make a close pass (50.1 LD, 0.1288 AU) travelling at 6.68 km/second, to the Earth-Moon system on the 4th June 2015 @ 21:45 UT ±01:59.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).