Hegemone (moon)

Hegemone
Discovery
Discovered by	Scott Sheppard et al.
Discovery date	2003
Designations
Designation	Jupiter XXXIX
Pronunciation	/həˈdʒɛməniː/
Named after	Ἡγεμόνη Hēgemonē
Alternative names	S/2003 J 8
Adjectives	Hegemonean /ˌhɛdʒəməˈniːən/
Orbital characteristics
Observation arc	22 years; 2024-12-03 (last obs)
Semi-major axis	23947000 km
Eccentricity	0.328
Orbital period (sidereal)	−739.6 days
Inclination	155.2°
Satellite of	Jupiter
Group	Pasiphae group
Physical characteristics
Mean diameter	3 km
Apparent magnitude	22.8
Absolute magnitude (H)	15.63 (45 obs)

Hegemone /həˈdʒɛməniː/, also known as Jupiter XXXIX, is a natural satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaiʻi led by Scott S. Sheppard in 2003, and given the temporary designation S/2003 J 8.^[3]^[4]

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).^[5]

Hegemone belongs to the Pasiphae group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 and 24.1 million km, and with inclinations ranging between 144.5° and 158.3°.

References

↑ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
1 2 MPC Natural Satellites (Select: Orbital Elements)
↑ 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)

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[1] S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line

[MPC-NS-2] 1 2 MPC Natural Satellites (Select: Orbital Elements)

[3] IAUC 8088: S/2003 J 8 2003 March 6 (discovery)

[4] MPEC 2003-E24: S/2003 J 8 2003 March 6 (discovery and ephemeris)

[5] IAUC 8502: Satellites of Jupiter 2005 March 30 (naming the moon)

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v t e Moons of Jupiter
Listed in increasing approximate distance from Jupiter
Inner moons	Metis Adrastea Amalthea Thebe
Galilean moons	Io Europa Ganymede Callisto
Themisto	Themisto
Himalia group (11)	Leda Ersa S/2018 J 2 Himalia Pandia Lysithea Elara S/2011 J 3 Dia +2 more
Carpo group (2)	S/2018 J 4 Carpo
Valetudo	Valetudo
Ananke group (29)	Euporie Jupiter LV Eupheme Jupiter LII Jupiter LIV Mneme Euanthe S/2003 J 16 Harpalyke Orthosie Helike Praxidike Jupiter LXIV S/2003 J 12 Jupiter LXVIII Thelxinoe Thyone Jupiter LXXIII Ananke Iocaste Hermippe Jupiter LXX +7 more
Carme group (41)	Jupiter LXIX Pasithee S/2003 J 24 Chaldene Jupiter LXIII Isonoe Kallichore Erinome Kale Eirene Aitne Eukelade Arche Taygete Jupiter LXXII Carme Herse Jupiter LXI Jupiter LI S/2003 J 9 Jupiter LXVI Kalyke S/2003 J 10 +18 more
Pasiphae group (22)	Philophrosyne Eurydome Jupiter LVI S/2003 J 4 Jupiter LXVII Hegemone Pasiphae Sponde Megaclite Cyllene Sinope Jupiter LIX Aoede Autonoe Callirrhoe S/2003 J 23 Kore +5 more
See also	Rings of Jupiter Jupiter's moons in fiction
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References