Leda (moon)
From Wikipedia, the free encyclopedia
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Discovery
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| Discovered by | Charles T. Kowal |
| Discovery date | September 11, 1974[1] |
| Mean orbit radius | 11,160,000 km[2] |
| Eccentricity | 0.16[2] |
| Orbital period | 240.92 d (0.654 a)[2] |
| Average orbital speed | 3.4 km/s |
| Inclination | 27.46° (to the ecliptic) 29.01° (to Jupiter's equator)[2] |
| Satellite of | Jupiter |
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Physical characteristics
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| Mean radius | 10 km |
| Surface area | ~1250 km² |
| Volume | ~4200 km³ |
| Mass | 1.1×1016 kg |
| Mean density | 2.6 g/cm³ (assumed) |
| Equatorial surface gravity | ~0.0073 m/s2 (0.001 g) |
| Escape velocity | ~0.012 km/s |
| Albedo | 0.04 (assumed) |
| Temperature | ~124 K |
| Apparent magnitude | 20.2 [3] |
Leda (pronounced /ˈliːdə/ LEE-də, or as Greek Λήδα), also known as Jupiter XIII, is a prograde irregular satellite of Jupiter. It was discovered by Charles T. Kowal at the Mount Palomar Observatory on September 14, 1974, after three nights' worth of photographic plates had been taken (September 11 through 13; Leda appears on all of them).[1][4] It was named after Leda, who was a lover of Zeus, the Greek equivalent of Jupiter (who came to her in the form of a swan). Kowal suggested the name and the IAU endorsed it in 1975.[5]
Leda belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°.[2] The orbital elements given here are as of January 2000, but they are continuously changing due to Solar and planetary perturbations.
[edit] See also
[edit] References
- ^ a b Kowal, C. T.; Aksnes, K.; Marsden, B. G.; and Roemer, E. (1974). "Thirteenth satellite of Jupiter". Astronomical Journal 80: pp. 460–464.
- ^ a b c d e Jacobson, R. A. (2000). "The orbits of outer Jovian satellites". Astronomical Journal 120: 2679. doi:.
- ^ Leda Statistics. Retrieved on 2007-10-01.
- ^ IAUC 2702: Probable New Satellite of Jupiter 1974 September 20 (discovery)
- ^ Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAUC Circular 2846.
[edit] External links
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