Astronomers have discovered the first object ever that is in a companion orbit to the Earth. Asteroid 2002 AA29 is only about 100 metres wide and never comes closer than 3.6 million miles to our planet. But it shares the Earth's orbit around the Sun, at first on one side of the Earth and then escaping to travel along our planet's path around the Sun until it encounters the Earth from the other side. Then it goes back again. 2002 AA29 was discovered by the linear automated sky survey project on 9 January 2002. Martin Connors of Athabaseca University in Canada writes in the journal Meteoritics and Planetary Science that it, "moves in a very Earth-like orbit," and is the "first true co-orbital object of Earth."

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