* Astronomy

The 600 - 1300 metre wide asteroid 2004 QT24 will make a close pass (54.7 lunar distances, 0.1405 AU), travelling at 13.24 km/second, to the Earth-Moon system on the 17th April, 2011 @ 15:05 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).