The 27 - 60 metre wide asteroid 2014 SO260 made a close pass (22.3 lunar distances, 0.0573 AU), travelling at 14.26 km/second, to the Earth-Moon system on the 24th September 2014 @ 05:28 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).
