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Iocaste (moon)

Iocaste (moon)

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Discovered by Scott S. Sheppard
Discovery date November 23, 2000 [1]
Jupiter XXIV
Orbital characteristics
Periapsis 16,696,393 km (0.111 608 AU)
Apoapsis 25,847,607 km (0.172 780 AU)
Mean orbit radius
21,272,000 km (0.142 194 AU)
Eccentricity 0.2874
Satellite of Jupiter
Physical characteristics
Mean radius
2.6 km
84.95 km2 (0.082 Earths)
Volume 74 km3 (6.8×1011 Earths)
Mass 1.9483×1014 kg (3.26×1011 Earths)
Mean density
2.6 g/cm3
0.002 m/s2 (0.0002 g)
11  km/h[1]

Iocaste (/ˈkæst/ eye-o-KAS-tee; Greek: Ιοκάστη), also known as Jupiter XXIV, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2000, and given the temporary designation S/2000 J 3.[2][3]

Iocaste orbits Jupiter at an average distance of 20,723 million kilometers in 609.427 days, at an inclination of 147° to the ecliptic (146° to Jupiter's equator) with an eccentricity of 0.2874.

It was named in October 2002 after Jocasta,[4] the mother/wife of Oedipus in Greek mythology.

Iocaste belongs to the Ananke group, believed to be the remnants of a break-up of a captured heliocentric asteroid.[5][6]

The satellite is about 5 kilometres in diameter[7] and appears grey (colour indices B−V=0.63, R−V=0.36), similar to C-type asteroids.[8]


  1. ^ a b "Iocaste: By the Numbers". NASA. Retrieved 2015-03-29. 
  2. ^ Daniel W. E. Green (January 5, 2001). "Satellites of Jupiter". International Astronomical Union Central Bureau for Astronomical Telegrams. 
  3. ^ Brian G. Marsden (January 5, 2001). "S/2000 J 2, S/2000 J 3, S/2000 J 4, S/2000 J 5, S/2000 J 6". International Astronomical Union Minor Planet Center. 
  4. ^ Daniel W. E. Green (October 22, 2002). "Comet P/2002 T5 (Linear)". International Astronomical Union Central Bureau for Astronomical Telegrams. 
  5. ^ Sheppard, S. S.; Jewitt, D. C.; "An Abundant Population of Small Irregular Satellites Around Jupiter" Archived August 13, 2006, at the Wayback Machine., Nature, Vol. 423 (May 2003), pp. 261–263
  6. ^ Nesvorný, D.; Alvarellos, J. L. A.; Dones, L.; and Levison, H. F.; "Orbital and Collisional Evolution of the Irregular Satellites", The Astronomical Journal, Vol. 126 (2003), pp. 398–429[dead link]
  7. ^ Sheppard, S. S.; Jewitt, D. C.; Porco, C. C.; "Jupiter's Outer Satellites and Trojans" Archived June 14, 2007, at the Wayback Machine., in Jupiter: The Planet, Satellites and Magnetosphere, edited by Fran Bagenal, Timothy E. Dowling, and William B. McKinnon, Cambridge Planetary Science, Vol. 1, Cambridge, UK: Cambridge University Press, ISBN 0-521-81808-7, 2004, pp. 263–280
  8. ^ Grav, T.; Holman, M. J.; Gladman, B. J.; and Aksnes, K.; "Photometric survey of the irregular satellites", Icarus, Vol. 166 (2003), pp. 33–45

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