The 80 - 180 metre wide asteroid 2014 SX141 will make a close pass (73.4 lunar distances, 0.1887 AU) travelling at 4.11 km/second, to the Earth-Moon system on the 24th October 2014 @ 18:32 UT ±00:55.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).