Lysithea (moon)
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| Discovery | |
|---|---|
| Discovered by: | S. B. Nicholson |
| Discovery date: | July 6, 1938[1] |
| Orbital characteristics | |
| Mean radius of orbit: | 11,720,000 km[2] |
| Eccentricity: | 0.11[2] |
| Orbital period: | 259.20 d (0.69 a)[2] |
| Avg. orbital speed: | 3.29 km/s |
| Inclination: | 28.30° (to the ecliptic) 25.77° (to Jupiter's equator)[2] |
| 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 (assumed) |
| Equatorial surface gravity: | ~0.013 m/s2 (0.001 g) |
| Escape velocity: | ~0.022 km/s |
| Albedo: | 0.04 (assumed) |
| Temperature: | ~124 K |
Lysithea is a prograde non-spherical moon of Jupiter. It was found by Seth Barnes Nicholson in 1938 at Mount Wilson Observatory[1] and is named after the mythological Lysithea, daughter of Oceanus and one of Zeus' lovers.[3]
Lysithea didn't get its present name until 1975; before then, it was simply known as Jupiter X. It was sometimes called "Demeter"[4] 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°.[2] Its orbital elements are as of January 2000. They are changing a lot due to Solar and planetary perturbations.
[change] References
- ↑ 1.0 1.1 Nicholson, S. B. (1938). "Two New Satellites of Jupiter". Publications of the Astronomical Society of the Pacific 50: 292–293.
- ↑ 2.0 2.1 2.2 2.3 2.4 Jacobson, R. A. (2000). "The orbits of outer Jovian satellites". Astronomical Journal 120: 2679-2686. DOI:10.1086/316817.
- ↑ Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAUC Circular 2846.
- ↑ Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-134-78107-4.
[change] Other websites
| Moons of Jupiter | |
|---|---|
| Listed in increasing distance from Jupiter. Temporary names in italics. | |
| 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 | |
