Iocaste (moon)

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Discovered byScott S. Sheppard
David C. Jewitt
Yanga R. Fernandez
and Eugene Magnier
Discovery dateNovember 23, 2000 [1]
Jupiter XXIV
Orbital characteristics
Periapsis16,696,393 km (0.111 608 AU)
Apoapsis25,847,607 km (0.172 780 AU)
Mean orbit radius
21,272,000 km (0.142 194 AU)
8,714.4 km/h
Satellite ofJupiter
Physical characteristics
Mean radius
2.6 km
84.95 km2 (0.082 Earths)
Volume74 km3 (6.8×1011 Earths)
Mass1.9483×1014 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. Archived from the original on April 12, 2016. Retrieved March 29, 2015.
  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

Further reading[edit]