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It varies depending on the asteroid's orbit. Most main-belt asteroids have semi-major axes of 2.1 to 3.3 astronomical units (AU), corresponding to orbital periods of about 3 to 6 years. The closest asteroid to the sun has an orbital period of just under 5 months. The farthest asteroids have semi-major axes of about 5.4 AU, corresponding to orbital periods between 12 and 13 years. Beyond this, asteroid-like objects will have compositions more like those of comets.

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8y ago

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