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Leda (moon)

Leda
Leda2(moon).jpg
Discovery
Discovered byCharles T. Kowal
Discovery dateSeptember 11, 1974[1]
Designations
Designation
Jupiter XIII
Pronunciation/ˈldə/[2]
Named after
Λήδα Lēdā
AdjectivesLedian /ˈldiən/,[3] Ledean /ˈldiən/[4] or /lˈdən/[5]
Orbital characteristics[6]
11165000 km
Eccentricity0.164
+240.9 days
228.1°
Inclination27.46°
217.1°
272.3°
Satellite ofJupiter
GroupHimalia group
Physical characteristics
Mean diameter
21.5±1.7 km[7]
Mass1.1×1016 kg[citation needed]
Mean density
2.6 g/cm3 (assumed)
~0.0073 m/s2 (0.001 g)
~0.012 km/s
Albedo0.034±0.006[7]
Temperature~124 K
20.2

Leda /ˈldə/, 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][8] It was named after Leda, who was raped[9] by 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.[10]

Leda belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°.[11] The orbital elements given here are as of January 2000, but they are continuously changing due to solar and planetary perturbations.

Single-exposure image of Leda by the Wide-field Infrared Survey Explorer (WISE) spacecraft in 2010

See also

References

  1. ^ a b Kowal, C. T.; Aksnes, K.; Marsden, B. G.; Roemer, E. (1974). "Thirteenth satellite of Jupiter". Astronomical Journal. 80: 460–464. Bibcode:1975AJ.....80..460K. doi:10.1086/111766.
  2. ^ "Leda". Lexico UK Dictionary. Oxford University Press.
  3. ^ Ken Monteith (2007) Yeats and theosophy, p. 10
  4. ^ Wit Pietrzak (2011) Myth, Language and Tradition: A Study of Yeats, Stevens, and Eliot in the Context of Heidegger's Search for Being, p. 70–72
  5. ^ R.W. Chapman (1939) Adjectives from Proper Names, p. 55
  6. ^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
  7. ^ a b Grav, T.; Bauer, J. M.; Mainzer, A. K.; Masiero, J. R.; Nugent, C. R.; Cutri, R. M.; et al. (August 2015). "NEOWISE: Observations of the Irregular Satellites of Jupiter and Saturn". The Astrophysical Journal. 809 (1): 9. Bibcode:2015ApJ...809....3G. doi:10.1088/0004-637X/809/1/3. 3.
  8. ^ Brian G. Marsden (September 20, 1974). "IAUC 2702: Probable New Satellite of Jupiter". International Astronomical Union.
  9. ^ Leda and the Swan
  10. ^ Marsden, Brian G. (October 7, 1975). "Satellites of Jupiter". International Astronomical Union.
  11. ^ Jacobson, R. A. (2000). "The orbits of outer Jovian satellites" (PDF). Astronomical Journal. 120 (5): 2679. Bibcode:2000AJ....120.2679J. doi:10.1086/316817.

External links

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