The 420 - 940 metre wide asteroid 2014 YY8 will make a close pass (58.0 LD, 0.1491 AU) travelling at 14.48 km/second, to the Earth-Moon system on the 21st March 2015 @ 09:24 UT ±00:06.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
