The 16 - 36 metre wide asteroid 2014 SS223 made a close pass (3.3 lunar distances, 0.0086 AU), travelling at 14.50 km/second, to the Earth-Moon system on the 21st September 2014 @ 14:02 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).
