* Astronomy

The 370 - 820 metre wide asteroid 2001 RN will make a close pass (60.6 lunar distances, 0.1558 AU), travelling at 17.72 km/second, to the Earth-Moon system on the 20th February, 2013 @ 09:55 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).