| Discovery | |
|---|---|
| Discovered by | Scott Sheppard et al. |
| Discovery date | 2003 |
| Designations | |
Designation | Jupiter XXXIX |
| Pronunciation | /hɪˈdʒɛməniː/ |
Named after | Ἡγεμόνη Hēgemonē |
| S/2003 J 8 | |
| Adjectives | Hegemonean /ˌhɛdʒɪməˈniːən/ |
| Orbital characteristics [1] | |
Semi-major axis | 23947000 km |
| Eccentricity | 0.328 |
| −739.6 days | |
| Inclination | 155.2° |
| Satellite of | Jupiter |
| Group | Pasiphae group |
| Physical characteristics | |
Mean diameter | 3 km |
Apparent magnitude | 22.8 |
Hegemone /hɪˈdʒɛməniː/, also known as Jupiter XXXIX, is a natural satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003, and given the temporary designation S/2003 J 8.[2][3]
Hegemone is about 3 kilometres in diameter, and orbits Jupiter at an average distance of 23,703,000 km in 745.500 days, at an inclination of 153° to the ecliptic (151° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.4077.
It was named in March 2005 after Hegemone, one of the Graces, and a daughter of Zeus (Jupiter).[4]
Hegemone belongs to the Pasiphae group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 and 24.1 Gm, and with inclinations ranging between 144.5° and 158.3°.
References
- ^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
- ^ IAUC 8088: S/2003 J 8 2003 March 6 (discovery)
- ^ MPEC 2003-E24: S/2003 J 8 2003 March 6 (discovery and ephemeris)
- ^ IAUC 8502: Satellites of Jupiter 2005 March 30 (naming the moon)