Astronomy:Thyone (moon)

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Short description: Moon of Jupiter
Thyone
Thyone-discovery-CFHT-annotated.gif
Discovery images of Thyone by the Canada-France-Hawaii Telescope in December 2001
Discovery[1]
Discovered byScott S. Sheppard et al.
Discovery siteMauna Kea Obs.
Discovery date11 December 2001
Designations
Designation
Jupiter XXIX
Pronunciation/θˈn/[2]
Named afterΘυώνη Thyōnē
S/2001 J 2
AdjectivesThyonean /ˌθəˈnən/[3]
Orbital characteristics[5]
20940000 km
Eccentricity0.229
Orbital period−603.58 days[4]
Mean anomaly26.6°
Inclination148.5°
Longitude of ascending node243.0°
89.1°
Satellite ofJupiter
GroupAnanke group
Physical characteristics
Mean diameter4 km
Apparent magnitude22.3


Thyone /θˈn/, 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 in 2001, and given the temporary designation S/2001 J 2.[6][1]

Thyone is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 21,605,000 kilometres in 603.58 days, at an inclination of 147.28° to the ecliptic (146.93° to Jupiter's equator) with an eccentricity of 0.2526. Its average orbital speed is 2.43 km/s.

It was named in August 2003 after Thyone, better known as Semele, mother of Dionysus in Greek mythology.[7]

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

Thyone imaged by the CFHT on 10 December 2001, one day before its discovery

References

  1. 1.0 1.1 MPEC 2002-J54: Eleven New Satellites of Jupiter 2002 May (discovery and ephemeris)
  2. Noah Webster (1884) A Practical Dictionary of the English Language
  3. E. R. Gregory (1989) Milton and the Muses, p. 50;
    Sidney Alexander (2016) The Complete Odes and Satires of Horace, p. 321
  4. "M.P.C. 104798". Minor Planet Circular. Minor Planet Center. 10 May 2017. https://minorplanetcenter.net/iau/ECS/MPCArchive/2017/MPC_20170510.pdf. 
  5. S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
  6. IAUC 7900: Satellites of Jupiter 2002 May 16 (discovery)
  7. IAUC 8177: Satellites of Jupiter, Saturn, Uranus 2003 August (naming the moon)