The 210 - 470 metre wide asteroid 2014 DH80 will make a close pass (41.4 lunar distances, 0.1063 AU), travelling at 18.37 km/second, to the Earth-Moon system on the 31st August 2014 @ 17:35 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).
