The 39 - 88 metre wide asteroid 2014 FF will make a close pass (15.5 lunar distances, 0.0398 AU), travelling at 8.86 km/second, to the Earth-Moon system on the 28th March 2014 @ 02:37 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).