Hellenica World

Discovered by S. B. Nicholson
Discovered in July 6, 1938
Orbital characteristics
Mean radius 11,653,230 km (0.07790 AU)
Eccentricity 0.1132
Periastron 10,334,100 km (0.069 AU)
Apastron 12,972,300 km (0.087 AU)
Orbital period 256.995 d (0.684 a)
Orbital circumference km]] (0.488 AU)
Orbital velocity max: 3.695 km/s
mean: 3.287 km/s
min: 2.943 km/s
Inclination 27.78° (to the ecliptic)
25.77° (to Jupiter's equator)
Is a satellite of Jupiter
Physical characteristics
Mean diameter 36 km
Surface area ~4100 km2
Volume ~24,400 km3
Mass 6.3×1016 kg
Mean density 2.6 g/cm3
Surface gravity ~0.013 m/s2 (0.001 g)
Escape velocity ~0.022 km/s
Rotation period  ?
Axial tilt  ?°
Albedo 0.04
Surface temp.
min mean max
K ~124 K K
Atmospheric pressure 0 kPa

Lysithea (lye-sith'-ee-a or li-sith'-ee-a, IPA /laɪ'sɪ.θi.ə/, /lɪ'sɪ.θi.ə/; Greek Λυσιθέα) is a moon of Jupiter. It was discovered by Seth Barnes Nicholson in 1938 at Mount Wilson Observatory and is named after the mythological Lysithea, daughter of Oceanus and one of Zeus' lovers.

Lysithea did not receive its present name until 1975; before then, it was simply known as Jupiter X. It was sometimes called "Demeter".

It belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°.


Seth B. Nicholson, "Two new satellites of Jupiter", PASP 50 (1938) 292–293

... | Himalia | Lysithea | Elara | ...

Jupiter's natural satellites

Inner satellites | Galilean moons: Io, Europa, Ganymede, and Callisto | Themisto | Himalia group | Carpo | S/2003 J 12 | Ananke group | Carme group | Pasiphaë group | S/2003 J 2

see also: The Solar System

Astronomy Encyclopedia

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