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Thyone (moon)

Thyone
Discovery
Discovered byScott S. Sheppard
Discovery date2001
Designations
Designation
Jupiter XXIX
Pronunciation/θˈn/[1]
Named after
Θυώνη Thyōnē
S/2001 J 2
AdjectivesThyonean /ˌθəˈnən/[2]
Orbital characteristics[3]
20940000 km
Eccentricity0.229
−627.3 days
26.6°
Inclination148.5°
243.0°
89.1°
Satellite ofJupiter
GroupAnanke group
Physical characteristics
Mean diameter
4 km
22.3

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, et al. in 2001, and given the temporary designation S/2001 J 2.[4][5]

Thyone is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 21,605,000 kilometres in 639.803 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.[6]

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°.

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ E. R. Gregory (1989) Milton and the Muses, p. 50;
    Sidney Alexander (2016) The Complete Odes and Satires of Horace, p. 321
  3. ^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
  4. ^ IAUC 7900: Satellites of Jupiter 2002 May 16 (discovery)
  5. ^ MPEC 2002-J54: Eleven New Satellites of Jupiter 2002 May (discovery and ephemeris)
  6. ^ IAUC 8177: Satellites of Jupiter, Saturn, Uranus Archived 2008-07-09 at the Wayback Machine 2003 August (naming the moon)