The 33 - 75 metre wide asteroid 2003 YH111 will make a close pass (41.6 lunar distances, 0.1070 AU), travelling at 10.80 km/second, to the Earth-Moon system on the 31st May 2014 @ 07:15 UT ±1 day 10:02.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
