The 38 - 86 metre wide asteroid 2014 GJ1 will make a close pass (69.9 LD, 0.1797 AU) travelling at 5.92 km/second, to the Earth-Moon system on the 20th June 2015 @ 14:28 UT ±04:24.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).