The 800 - 1800 metre wide asteroid 139289 (2001 KR1) will make a close pass (73.3 lunar distances, 0.18849 AU), travelling at 29.70 km/second, to the Earth on the 12th June 2018 @ 19:25 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).