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Comets are in unstable orbits that evolve due to perturbations and outgassing. Tempel 1 passed within 0.04 AU - or 5.9 e6km - of the dwarf planet Ceres on 11 November 2011. Then, as a Jupiter-family comet, it will spend years interacting with the giant planet Jupiter, and by October 2084 perihelion will be lifted as high as 1.98 AU.

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