* Astronomy

The 64 - 140 metre wide asteroid 2013 YS2 will made a close pass (21.8 lunar distances, 0.0561 AU), travelling at 3.68 km/second, to the Earth-Moon system on the 23rd January 2014 @ 07:08 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).