The 7 - 16 metre wide asteroid 2018 KS will make a close pass (2.0 lunar distances, 0.00527 AU), travelling at 7.67 km/second, to the Earth on the 22nd May 2018 @ 04:02 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).
