The 42 - 94 metre wide asteroid 2018 FB will make a close pass (4.88 lunar distances, 0.01254 AU), travelling at 8.48 km/second, to the Earth on the 29th March 2018 @ 21:39 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).