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(42355) Typhon I Echidna : ウィキペディア英語版 | 42355 Typhon
42355 Typhon (; from (ギリシア語:''Τυφών'')) is a scattered disc object that was discovered on February 5, 2002, by the NEAT program. It measures 162±7 km in diameter, and is named after Typhon, a monster in Greek mythology. A large moon was identified in 2006. It is named Echidna—formal designation (42355) Typhon I Echidna, , from (ギリシア語:''Έχιδνα'')—after Echidna, the monstrous mate of Typhon. It orbits Typhon at ~1300 km, completing one orbit in about 11 days. Its diameter is estimated to be 89±6 km. Typhon is the first known binary centaur,〔 〕 using an extended definition of a centaur as an object on a non-resonant (unstable) orbit with the perihelion inside the orbit of Neptune.〔 〕 ==References==
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