- (153591) 2001 SN263
mp|(153591) 2001 SN|263 (also written (153591) 2001 SN263) is a small
near-Earth asteroid discovered by theLINEAR project in2001 . In2008 , scientists at theArecibo Observatory discovered that the object is orbited by two moons, and with a distance of 11.2 million km at closest approach is the closest triple asteroid system to the Earth. The three bodies are close in size: mp|2001 SN|263 itself is 2 km in diameter, while its companions are 1 km and 0.4 km in diameter.External links
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* Robert Roy Britt, [http://www.space.com/scienceastronomy/080213-triple-asteroid.html Triple Asteroid Found Near Earth] , "Space.com", 13 Feb 2008
* Emily Lakdawalla, [http://www.planetary.org/blog/article/00001326/ Triple Near-Earth Asteroid Discovered] "The Planetary Society", 13 Feb 2008
* [http://www.naic.edu/~pradar/asteroids/2001SN263/ Images of the asteroid and its moons]
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