* Astronomy

The 70 - 160 metre wide asteroid 2013 QN11 will make a close pass (13.3 lunar distances, 0.0343 AU), travelling at 13.02 km/second, to the Earth-Moon system on the 22nd September, 2013 @ 15:17 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).