The 380 - 860 metre wide asteroid 1998 UT18 made a close pass (67.1 lunar distances, 0.1724 AU), travelling at 13.62 km/second, to the Earth-Moon system on the 21st November, 2013 @ 16:01 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).
