Thyone (moon)

Thyone
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/θaɪˈoʊniː/[2]
Named after
Θυώνη Thyōnē
S/2001 J 2
AdjectivesThyonean /ˌθaɪəˈniːən/[3]
Orbital characteristics [4]
20940000 km
Eccentricity0.229
−603.58 days[5]
26.6°
Inclination148.5°
243.0°
89.1°
Satellite ofJupiter
GroupAnanke group
Physical characteristics
4 km
Spectral type
B–V = 0.71 ± 0.06, V–R = 0.45 ± 0.04[6]
22.3

Thyone /θaɪˈoʊniː/, 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.[7][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.[8]

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
  1. ^ a b 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. ^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
  5. ^ Cite error: The named reference MPC104798 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference GraykowskiJewitt2018 was invoked but never defined (see the help page).
  7. ^ IAUC 7900: Satellites of Jupiter 2002 May 16 (discovery)
  8. ^ IAUC 8177: Satellites of Jupiter, Saturn, Uranus Archived 2008-07-09 at the Wayback Machine 2003 August (naming the moon)