The 9 - 19 metre wide asteroid 2018 FC3 will make a close pass (5.24 lunar distances, 0.0134 AU), travelling at 15.31 km/second, to the Earth on the 23rd March 2018 @ 19:08 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).