The 270 - 590 metre wide asteroid 2015 LH14 will make a close pass (61.7 LD, 0.1586 AU) travelling at 7.94 km/second, to the Earth-Moon system on the 20th July 2015 @ 22:57 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).
