The 25 - 57 metre wide asteroid 2015 KT120 will make a close pass (76.6 lunar distances, 0.19682 AU), travelling at 8.45 km/second, to the Earth on the 12th June 2018 @ 16:20 UT ±00:01.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).