The 23 - 52 metre wide asteroid 2014 UF8 will make a close pass (17.8 lunar distances, 0.0458 AU) travelling at 7.64 km/second, to the Earth-Moon system on the 25th October 2014 @ 23:22 UT ±00:02.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).