Lysithea (moon) facts for kids

Kids Encyclopedia Facts
Discovered by S. B. Nicholson
Discovery date July 6, 1938
Adjective Lysithean
Avgdistance from the center of its orbital path 11,720,000 km
How long it takes to complete an orbit 259.20 d (0.69 a)
Average speed 3.29 km/s
Angle above the reference plane
28.30° (to the ecliptic)
25.77° (to Jupiter's equator)
What it orbits Jupiter
Size and other qualities
Average radius 18 km
Surface area ~4100 km²
Volume ~24,400 km³
Mass 6.3×1016 kg
Average density 2.6 g/cm³ (assumed)
Surface gravity ~0.013 m/s2 (0.001 g)
Escape velocity ~0.022 km/s
How much light it reflects 0.04 (assumed)
Avg. surface temp. ~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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Lysithea (moon) Facts for Kids. Kiddle Encyclopedia.