* Astronomy

The 330 - 750 metre wide asteroid 2013 PD21 will make a close pass (62.5 lunar distances, 0.1606 AU), travelling at 20.84 km/second, to the Earth-Moon system on the 26th January, 2014 @ 16:57 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).