* Astronomy

The 210 - 460 metre wide asteroid 2001 YE4 will make a close pass (26.0 lunar distances, 0.0668 AU), travelling at 10.79 km/second, to the Earth-Moon system on the 26th December, 2011 @ 17:15 UT ±00:10.

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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).