Iocaste (moon)
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard |
| Discovery date | 23 November 2000 [1] |
| Designations | |
| Alternative names | Jupiter XXIV |
| Adjective | Ionian |
| Orbital characteristics | |
| Periapsis | 16,696,393 km (0.002 807 AU) |
| Apoapsis | 25,847,607 km (0.002 830 AU) |
| Mean orbit radius | 21,272,000 km (0.002 819 AU) |
| Eccentricity | 0.0041 |
| Satellite of | Jupiter |
| Physical characteristics | |
| Mean radius | 2.6 km |
| Surface area | 84.95 km2 (0.082 Earths) |
| Volume | 74×1010 km3 (0.023 Earths) |
| Mass | 1.9483×1014 kg (0.015 Earths) |
| Mean density | 2.6 g/cm3 |
| Equatorial surface gravity | .002 m/s2 (0.183 g) |
| Escape velocity | 11 km/h[1] |
Iocaste (/ˌaɪ.ɵˈkæstiː/ 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 Mm 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]
References[edit]
- ^ a b https://sse.jpl.nasa.gov/planets/profile.cfm?Object=Jup_Iocaste&Display=Facts&System=Metric
- ^ IAUC 7555: Satellites of Jupiter January 5, 2001 (discovery)
- ^ MPEC 2001-A28: S/2000 J 2, S/2000 J 3, S/2000 J 4, S/2000 J 5, S/2000 J 6 January 5, 2001 (discovery and ephemeris)
- ^ IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)
- ^ Sheppard, S. S.; Jewitt, D. C.; An Abundant Population of Small Irregular Satellites Around Jupiter, Nature, Vol. 423 (May 2003), pp. 261-263
- ^ 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
- ^ Sheppard, S. S.; Jewitt, D. C.; Porco, C. C.; Jupiter's Outer Satellites and Trojans, 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
- ^ Grav, T.; Holman, M. J.; Gladman, B. J.; and Aksnes, K.; Photometric survey of the irregular satellites, Icarus, Vol. 166 (2003), pp. 33-45
- Ephemeris IAU-MPC NSES
- Mean orbital parameters NASA JPL
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