Nearby asteroid found orbiting sun backwards

* 23:50 01 May 2009 by Jeff Hecht

The discovery of a 2- to 3-kilometre-wide asteroid in an orbit that goes backwards has set astronomers scratching their heads. It comes closer to Earth than any other object in a 'retrograde' orbit, and astronomers think they should have spotted it before.

The object, called 2009 HC82, was discovered by the Catalina Sky Survey in Arizona on the morning of 29 April.

From observations of its position by five different groups, Sonia Keys of the International Astronomical Union's Minor Planet Center calculated it orbits the sun every 3.39 years on a path that ventures within 3.5 million km of the Earth's orbit. Combined with its size, that makes 2009 HC82 a potentially hazardous asteroid.

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Word of the Day
Friday May 1, 2009

risible \RIZ-uh-buhl\ , adjective:
1. Capable of laughing; disposed to laugh.
2. Exciting or provoking laughter; worthy of laughter; laughable; amusing.
3. Relating to, connected with, or used in laughter; as, "risible muscles."