Praxidike (moon)

Praxidike /prækˈsɪdɪkiː/, 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,[6][1] and given the temporary designation S/2000 J 7.

Praxidike
Praxidike imaged by the Canada-France-Hawaii Telescope in December 2001
Discovery[1]
Discovered byScott S. Sheppard et al.
Discovery siteMauna Kea Obs.
Discovery date23 November 2000
Designations
Designation
Jupiter XXVII
Pronunciation/prækˈsɪdɪkiː/[2]
Named after
Πραξιδίκη Praxidikē
S/2000 J 7
AdjectivesPraxidikean /ˌpræksɪdɪˈkiːən/[3]
Orbital characteristics [4]
21147000 km
Eccentricity0.230
−625.3 days
21.8°
Inclination149.0°
285.2°
209.7°
Satellite ofJupiter
GroupAnanke group
Physical characteristics
Mean diameter
7.0±0.7 km[5]
Albedo0.029±0.006[5]
21.2

    It was named in August 2003 after Praxidice,[7] the Greek goddess of punishment.

    Orbit
    Praxidike observed by the WISE spacecraft in 2010

    Praxidike orbits Jupiter at an average distance of 20,824,000 km 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.[8][9] With an estimated diameter of 7 km, Praxidike is the second largest member of the group after Ananke itself (assumed albedo of 0.04).[10]

    Characteristics

    The satellite appears grey (colour indices B-V=0.77, R-V= 0.34), typical of C-type asteroids.[11]

    gollark: It seems like - since there's not any mention of the eldraeverse having moonbrains everywhere - there's some reason you can't just cheaply stick some self-replicating machinery on a planet and come back in a hundred years and... do moonbrain things.
    gollark: Giant fractal things are a nice decoration for *any* planet, really.
    gollark: Especially since the magic phased array thing will probably dump lots of heat for all the computing and... phased-arraying, I have no idea how an optical one would actually work internally.
    gollark: I think a big problem for this whole moonbrain thing might be heat.
    gollark: I assume they meant *optical* phased array, given the "screen" bit, which would be different.

    References
    1. 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)
    2. as 'Praxidice' in Noah Webster (1884) A Practical Dictionary of the English Language
    3. There is also 'Praxidician' /præksɪˈdɪʃiən/, as in the 'Praxidician goddesses' that include Praxidice, but this does not derive from the name Praxidice itself.
    4. S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
    5. 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.
    6. IAUC 7555: Satellites of Jupiter January 5, 2001 (discovery)
    7. IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)
    8. Sheppard, S. S., Jewitt, D. C.; An Abundant Population of Small Irregular Satellites Around Jupiter Archived 2003-08-05 at the Wayback Machine, Nature, Vol. 423 (May 2003), pp. 261-263
    9. 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
    10. Sheppard, S. S.; Jewitt, D. C.; Porco, C.; Jupiter's Outer Satellites and Trojans Archived 2011-07-14 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
    11. Grav, T.; Holman, M. J.; Gladman, B. J.; Aksnes, K.; Photometric Survey of the Irregular Satellites, Icarus, Vol. 166 (2003), pp. 33-45
    1. Ephemeris IAU-MPC NSES
    2. Mean orbital parameters NASA JPL
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