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Lysithea (moon) facts for kids

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Lysithea
Discovery
Discovered by S. B. Nicholson
Discovery date July 6, 1938
Designations
Adjectives Lysithean
Orbital characteristics
Mean orbit radius
11,720,000 km
Eccentricity 0.11
259.20 d (0.69 a)
3.29 km/s
Inclination 28.30° (to the ecliptic)
25.77° (to Jupiter's equator)
Satellite of Jupiter
Physical characteristics
Mean radius
18 km
~4100 km²
Volume ~24,400 km³
Mass 6.3×1016 kg
Mean density
2.6 g/cm³ (assumed)
~0.013 m/s2 (0.001 g)
~0.022 km/s
Albedo 0.04 (assumed)
Temperature ~124 K

Lysithea (/[unsupported input]lˈsɪθiə/ ly-SITH-ee-ə, /lˈsɪθiə/ li-SITH-ee-ə; Greek: Λυσιθέα) is a prograde non-spherical moon of Jupiter. It was found 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 get its present name until 1975; before then, it was simply known as Jupiter X. It was sometimes called "Demeter" from 1955 to 1975.

It belongs to the Himalia group, five moons orbiting between 11,000,000 and 13,000,000 km from Jupiter at an inclination of about 28.3°. Its orbital elements are as of January 2000. They are changing a lot due to Solar and planetary perturbations.

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