The 23 - 52 metre wide asteroid 2008 CL20 will make a close pass (69.3 lunar distances, 0.1780 AU), travelling at 11.28 km/second, to the Earth-Moon system on the 20th January 2014 @ 23:46 UT ±06:45.
The 23 - 52 metre wide asteroid 2008 CL20 will make a close pass (45.4 lunar distances, 0.1168 AU), travelling at 9.96 km/second, to the Earth-Moon system on the 28th January, 2012 @ 02:44 UT ±08:08.
The 23 - 52 metre wide asteroid 2008 CL20 will make a close pass (23.1 lunar distances, 0.0594 AU), travelling at 9.46 km/second, to the Earth-Moon system on the 4th February, 2010. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).