Lysithea (moon)
From Wikipedia, the free encyclopedia
 |
The English used in this article may not be easy for everybody to understand. (September 2011) |
| Discovery | |
|---|---|
| Discovered by | S. B. Nicholson |
| Discovery date | July 6, 1938[1] |
| Designations | |
| Adjective | Lysithean |
| Orbital characteristics | |
| Mean orbit radius | 11,720,000 km[2] |
| Eccentricity | 0.11[2] |
| Orbital period | 259.20 d (0.69 a)[2] |
| Average 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[3] |
| Surface area | ~4100 km² |
| Volume | ~24,400 km³ |
| Mass | 6.3×1016 kg |
| Mean density | 2.6 g/cm³ (assumed)[3] |
| Equatorial surface gravity | ~0.013 m/s2 (0.001 g) |
| Escape velocity | ~0.022 km/s |
Lysithea (/laɪˈsɪθiə/ ly-SITH-ee-ə, /lɨˈsɪθiə/ 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[1] and is named after the mythological Lysithea, daughter of Oceanus and one of Zeus' lovers.[4]
Lysithea did not get its present name until 1975; before then, it was simply known as Jupiter X. It was sometimes called "Demeter"[5] 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.
References [change]
- ↑ 1.0 1.1 Nicholson, S. B. (1938). "Two New Satellites of Jupiter". Publications of the Astronomical Society of the Pacific 50: 292–293. http://adsabs.harvard.edu//full/seri/PASP./0050//0000292.000.html.
- ↑ 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.
- ↑ 3.0 3.1 3.2 "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 2008-10-24. http://ssd.jpl.nasa.gov/?sat_phys_par. Retrieved 2008-12-12.
- ↑ Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAUC Circular 2846. http://cfa-www.harvard.edu/iauc/02800/02846.html.
- ↑ Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-134-78107-4.
Other websites [change]
|
||||||||||||||||||||||||||||||||
