| Thyone | |
| Pronounced: | [1] |
| Adjective: | Thyonean [2] |
| Named After: | Θυώνη Thyōnē |
| Discoverer: | Scott S. Sheppard et al. |
| Discovered: | 11 December 2001 |
| Discovery Site: | Mauna Kea Obs. |
| Mpc Name: | Jupiter XXIX |
| Alt Names: | S/2001 J 2 |
| Orbit Ref: |  [3] |
| Inclination: | 148.5° |
| Eccentricity: | 0.229 |
| Arg Peri: | 89.1° |
| Asc Node: | 243.0° |
| Mean Anomaly: | 26.6° |
| Period: | −603.58 days |
| Satellite Of: | Jupiter |
| Group: | Ananke group |
| Magnitude: | 22.3 |
| Mean Diameter: | 4 km |
Thyone, also known as , 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 .[4] [5]
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.[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°.