Earth to Obtain a New Moon

Earth has acquired a "quasi-moon" - an asteroid that will encircle our planet for the next couple of years while it orbits the sun on a horseshoe-shaped path, according to a report to be published on Saturday in New Scientist.

The asteroid, 2003 YN17, "is probably a chunk of debris" from an impact between a larger space rock and the surface of the moon, the British weekly said.

2003 YN17's orbital plane is roughly the same as the earth's, but its unusual path, compounded by a corkscrew-like track, means that sometimes it is ahead of us and sometimes it is behind, inform Discovery channel

"Since 1996, its path has taken it round the earth, making it a quasi-satellite. This phase will last until 2006," the report says.

The finders are a team led by Paul Chodas, an asteroid specialist at NASA's famed Jet Propulsion Laboratory in California.

Two other "quasi-moons" - temporary fellow-travellers that loop around the earth for while as they girdle the sun - have been spotted in recent years: Cluithne and asteroid 2002, report

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