Thyone (moon)

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Thyone (/θˈn/ thy-OH-nee; Greek: Θυώνη), also known as Jupiter XXIX, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard, et al. in 2001, and given the temporary designation S/2001 J 2.12

Thyone is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 21,406 Mm in 639.803 days, at an inclination of 147° to the ecliptic (147° to Jupiter's equator) with an eccentricity of 0.2526.

It was named in August 2003 after Thyone, better known as Semele, one of Zeus' conquests in Greek mythology.3

Thyone belongs to the Ananke group, retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 Gm, at inclinations of roughly 150°.


  1. ^ IAUC 7900: Satellites of Jupiter 2002 May 16 (discovery)
  2. ^ MPEC 2002-J54: Eleven New Satellites of Jupiter 2002 May (discovery and ephemeris)
  3. ^ IAUC 8177: Satellites of Jupiter, Saturn, Uranus 2003 August (naming the moon)

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