The 20 - 45 metre wide asteroid 2014 RO60 made a close pass (24.3 lunar distances, 0.0625 AU), travelling at 7.19 km/second, to the Earth-Moon system on the 22nd September 2014 @ 21:59 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).
