Lysithea (moon)
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| Discovery | |
|---|---|
| Discovered by: | S. B. Nicholson |
| Discovery date: | July 6, 1938 |
| Orbital characteristics | |
| Periapsis: | 10,334,100 km (0.069 AU) |
| Apoapsis: | 12,972,300 km (0.087 AU) |
| Mean radius of orbit: | 11,653,230 km (0.07790 AU) |
| Orbital circumference: | 72,984,250 km (0.488 AU) |
| Eccentricity: | 0.1132 |
| Orbital period: | 256.995 d (0.684 a) |
| Avg. orbital speed: | 3.287 km/s |
| Max. orbital speed: | 3.695 km/s |
| Min. orbital speed: | 2.943 km/s |
| Inclination: | 27.78° (to the ecliptic) 25.77° (to Jupiter's equator) |
| Satellite of: | Jupiter |
| Physical characteristics | |
| Mean radius: | 18 km |
| Surface area: | ~4100 km2 |
| Volume: | ~24,400 km3 |
| Mass: | 6.3×1016 kg |
| Mean density: | 2.6 g/cm3 |
| Equatorial surface gravity: | ~0.013 m/s2 (0.001 g) |
| Escape velocity: | ~0.022 km/s |
| Albedo: | 0.04 |
| Temperature: | ~124 K |
Lysithea (lye-sith'-ee-ə or lə-sith'-ee-ə, IPA: [laɪˈsɪθiə, ləˈsɪθiə]; Greek Λυσιθέα) is a prograde irregular satellite 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°.
[edit] External links
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Listed in increasing distance from Jupiter. Italics indicate ungrouped moons.
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| Amalthea group | Metis · Adrastea · Amalthea · Thebe |
| Galilean moons | Io · Europa · Ganymede · Callisto |
| Themisto | |
| Himalia group | Leda · Himalia · Lysithea · Elara · S/2000 J 11 |
| Carpo · S/2003 J 12 | |
| Ananke group | Ananke · Praxidike · Harpalyke · Iocaste · Euanthe · Thyone (core) Euporie · S/2003 J 3 · S/2003 J 18 · Thelxinoe · Helike · Orthosie · S/2003 J 16 · Hermippe · Mneme · S/2003 J 15 (peripheral) |
| Carme group | S/2003 J 17 · S/2003 J 10 · Pasithee · Chaldene · Arche · Isonoe · Erinome · Kale · Aitne · Taygete · S/2003 J 9 · Carme · S/2003 J 5 · S/2003 J 19 · Kalyke · Eukelade · Kallichore |
| Pasiphaë group | Eurydome · S/2003 J 23 · Hegemone · Pasiphaë · Sponde · Cyllene · Megaclite · S/2003 J 4 · Callirrhoe · Sinope · Autonoe · Aoede · Kore |
| S/2003 J 2 | |
