Hegemone (moon)


Discovered byScott Sheppard et al.
Discovery date2003
Jupiter XXXIX
Named after
Ἡγεμόνη Hēgemonē
S/2003 J 8
AdjectivesHegemonean /ˌhɛəməˈnən/
Orbital characteristics[1]
23947000 km
−739.6 days
Satellite ofJupiter
GroupPasiphae group
Physical characteristics
Mean diameter
3 km

Hegemone /həˈɛmən/, 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°.


  1. ^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
  2. ^ IAUC 8088: S/2003 J 8 2003 March 6 (discovery)
  3. ^ MPEC 2003-E24: S/2003 J 8 2003 March 6 (discovery and ephemeris)
  4. ^ IAUC 8502: Satellites of Jupiter 2005 March 30 (naming the moon)