The 38 - 85 metre wide asteroid 2014 SS141 will make a close pass (62.3 lunar distances, 0.1601 AU), travelling at 4.63 km/second, to the Earth-Moon system on the 27th September 2014 @ 15:20 UT ±02:32.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).