Praxidike (moon)

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Praxidike (/prækˈsɪdɨk/ prak-SID-ə-kee; Greek: Πραξιδίκη), also known as Jupiter XXVII, 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,[1][2] and given the temporary designation S/2000 J 7.

Praxidike orbits Jupiter at an average distance of 20,824 Mm in 613.904 days, at an inclination of 144° to the ecliptic (143° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.1840.


Praxidike belongs to the Ananke group, believed to be the remnants of a break-up of a captured heliocentric asteroid.[4][5] With an estimated diameter of 7 km, Praxidike is the second largest member of the group after Ananke itself (assumed albedo of 0.04).[6]

The satellite appears grey (colour indices B-V=0.77, R-V= 0.34), typical of C-type asteroids.[7]


  1. ^ IAUC 7555: Satellites of Jupiter January 5, 2001 (discovery)
  2. ^ MPEC 2001-A29: S/2000 J 7, S/2000 J 8, S/2000 J 9, S/2000 J 10, S/2000 J 11 January 15, 2001 (discovery and ephemeris)
  3. ^ IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)
  1. Ephemeris IAU-MPC NSES
  2. Mean orbital parameters NASA JPL

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