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Chiron |
  
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Chiron |
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An unusual object orbiting between Saturn and Uranus, discovered in 1977 by US astronomer Charles Kowal. Chiron was initially classified as an asteroid, but it is now classified as a centaur. It has a 51-year orbit and a coma (cloud of gas and dust) caused by evaporation from its surface, resembling that of a comet.