) Praxidike imaged by the Canada-France-Hawaii Telescope in December 2001 | |
| Discovery[1] | |
|---|---|
| Discovered by | Scott S. Sheppard et al. |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 23 November 2000 |
| Designations | |
Designation | Jupiter XXVII |
| Pronunciation | /prækˈsɪdɪkiː/[2] |
Named after | Πραξιδίκη Praxidikē |
| S/2000 J 7 | |
| Adjectives | Praxidikean /ˌpræksɪdɪˈkiːən/[3] |
| Orbital characteristics [4] | |
Semi-major axis | 21147000 km |
| Eccentricity | 0.230 |
| −625.3 days | |
| 21.8° | |
| Inclination | 149.0° |
| 285.2° | |
Argument of perihelion | 209.7° |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
Mean diameter | 7.0±0.7 km[5] |
| Albedo | 0.029±0.006[5] |
Apparent magnitude | 21.2 |
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.
It was named in August 2003 after Praxidice,[7] the Greek goddess of punishment.
Orbit
)
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]
References
- ^ 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' /præksɪˈdɪʃiən/, 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
- ^ 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 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
- ^ 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