Praxidike (moon)

Praxidike
	Praxidike imaged by the Canada-France-Hawaii Telescope in December 2001
Discovery
Discovered by	Scott S. Sheppard et al.
Discovery site	Mauna Kea Obs.
Discovery date	23 November 2000
Designations
Designation	Jupiter XXVII
Pronunciation	/prækˈsɪdəkiː/
Named after	Πραξιδίκη Praxidikē
Alternative names	S/2000 J 7
Adjectives	Praxidikean /ˌpræksədəˈkiːən/
Orbital characteristics
Semi-major axis	21147000 km
Eccentricity	0.230
Orbital period (sidereal)	−609.25 days
Mean anomaly	21.8°
Inclination	149.0°
Longitude of ascending node	285.2°
Argument of perihelion	209.7°
Satellite of	Jupiter
Group	Ananke group
Physical characteristics
Mean diameter	7.0±0.7 km
Albedo	0.029±0.006
Apparent magnitude	21.2

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

It was named in August 2003 after Praxidike,^[8] the Greek goddess of punishment.

Orbit[edit]

Praxidike observed by the WISE spacecraft in 2010

Praxidike orbits Jupiter at an average distance of 20,824,000 km in 609.25 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.^[9]^[10] With an estimated diameter of 7 km, Praxidike is the second largest member of the group after Ananke itself (assumed albedo of 0.04).^[11]

Characteristics[edit]

The satellite appears grey (colour indices B-V=0.77, R-V= 0.34), typical of C-type asteroids.^[12]

References[edit]

^ ^a ^b 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)
^ as 'Praxidice' in Noah Webster (1884) A Practical Dictionary of the English Language
^ There is also 'Praxidician' /præksəˈdɪʃiən/, as in the 'Praxidician goddesses' that include Praxidice, but this does not derive from the name Praxidice itself.
^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
^ "M.P.C. 104798" (PDF). Minor Planet Circular. Minor Planet Center. 10 May 2017.
^ ^a ^b 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" (PDF). The Astrophysical Journal. 809 (1): 9. Bibcode:2015ApJ...809....3G. doi:10.1088/0004-637X/809/1/3. S2CID 5834661. 3.
^ IAUC 7555: Satellites of Jupiter January 5, 2001 (discovery)
^ 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 Archived 2003-08-05 at the Wayback Machine, 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.; Jupiter's Outer Satellites and Trojans Archived 2009-09-20 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
^ Grav, T.; Holman, M. J.; Gladman, B. J.; Aksnes, K.; Photometric Survey of the Irregular Satellites, Icarus, Vol. 166 (2003), pp. 33-45

Ephemeris IAU-MPC NSES
Mean orbital parameters NASA JPL

External links[edit]

[MPEC-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] s 'Praxidice' in Noah Webster (1884) A Practical Dictionary of the English Language

[3] There is also 'Praxidician' /præksəˈdɪʃiən/, 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

[MPC104798-5] "M.P.C. 104798" (PDF). Minor Planet Circular. Minor Planet Center. 10 May 2017.

[Grav2015-6] 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" (PDF). The Astrophysical Journal. 809 (1): 9. Bibcode:2015ApJ...809....3G. doi:10.1088/0004-637X/809/1/3. S2CID 5834661. 3.

[7] IAUC 7555: Satellites of Jupiter January 5, 2001 (discovery)

[8] IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)

[SheppardJewitt2003-9] 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

[Nesvorny2003-10] 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

[SheppardJewittPorco2004-11] Sheppard, S. S.; Jewitt, D. C.; Porco, C.; Jupiter's Outer Satellites and Trojans Archived 2009-09-20 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

[Grav2003-12] Grav, T.; Holman, M. J.; Gladman, B. J.; Aksnes, K.; Photometric Survey of the Irregular Satellites, Icarus, Vol. 166 (2003), pp. 33-45

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v t e Moons of Jupiter
Listed in increasing approximate distance from Jupiter
Inner moons	Metis Adrastea Amalthea Thebe
Galilean moons	Io Europa Ganymede Callisto
Themisto	Themisto
Himalia group (9)	Leda Ersa S/2018 J 2 Himalia Pandia Lysithea Elara S/2011 J 3 Dia
Carpo group (2)	S/2018 J 4 Carpo
Valetudo	Valetudo
Ananke group (26)	Euporie Jupiter LV Eupheme S/2021 J 3 Jupiter LII Jupiter LIV Mneme Euanthe S/2003 J 16 Harpalyke Orthosie S/2022 J 3 Helike S/2021 J 2 Praxidike Jupiter LXIV S/2021 J 1 S/2003 J 12 Jupiter LXVIII Thelxinoe Thyone S/2003 J 2 Ananke Iocaste Hermippe Jupiter LXX
Carme group (30)	S/2022 J 1 S/2022 J 2 S/2016 J 3 Pasithee Jupiter LXIX S/2021 J 6 S/2003 J 24 Chaldene Jupiter LXIII Isonoe S/2021 J 4 Kallichore Erinome Kale Eirene Aitne Eukelade Arche Taygete Jupiter LXXII Carme Herse Jupiter LXI Jupiter LI S/2003 J 9 Jupiter LXVI Kalyke S/2018 J 3 S/2021 J 5 S/2003 J 10
Pasiphae group (18)	Philophrosyne Eurydome Jupiter LVI S/2003 J 4 S/2016 J 4 Jupiter LXVII Hegemone Pasiphae Sponde Megaclite Cyllene Sinope Jupiter LIX Aoede Autonoe Callirrhoe S/2003 J 23 Kore
See also	Rings of Jupiter Jupiter's moons in fiction
Category