The 110 - 250 metre wide asteroid 2014 MY26 will make a close pass (50.7 lunar distances, 0.1302 AU), travelling at 8.24 km/second, to the Earth-Moon system on the 25th September 2014 @ 07:55 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).