The 24 - 55 metre wide asteroid 2018 FB3 will make a close pass (9.27 lunar distances, 0.0238 AU), travelling at 15.86 km/second, to the Earth on the 25th March 2018 @ 01:18 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).