Harpalyke (moon)
Harpalyke imaged by the Canada-France-Hawaii Telescope in December 2001 | |
| Discovery[1] | |
|---|---|
| Discovered by | Scott S. Sheppard David C. Jewitt Yanga R. Fernandez Eugene A. Magnier |
| Discovery site | Mauna Kea Observatory |
| Discovery date | 23 November 2000 |
| Designations | |
Designation | Jupiter XXII |
| Pronunciation | /hɑːrˈpæləkiː/[2] |
Named after | Ἁρπαλύκη Harpălykē |
| S/2000 J 5 | |
| Adjectives | Harpalykean /hɑːrpələˈkiːən/ |
| Orbital characteristics[3] | |
| Epoch 17 December 2020 (JD 2459200.5) | |
| Observation arc | 24 years 2024-12-02 (last obs) |
| 0.1422492 AU (21,280,180 km) | |
| Eccentricity | 0.1602677 |
| –634.19 d | |
| 321.08380° | |
| 0° 34m 3.555s / day | |
| Inclination | 148.29788° (to ecliptic) |
| 92.54746° | |
| 193.28018° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics[4] | |
| 4 km | |
| Albedo | 0.04 (assumed) |
Spectral type | C[5] |
| 22.2[6] | |
| 15.9[3] | |
Harpalyke /hɑːrˈpæləkiː/, also known as Jupiter XXII, is a little retrograde irregular satellite of Jupiter.
Discovery and Naming
It was discovered by a team of astronomers from the University of Hawaiʻi led by Scott S. Sheppard in 2000, and given the temporary designation S/2000 J 5.[7][1]
In August 2003, the moon was named[8] after Harpalyce, the incestuous daughter of Clymenus, who in some accounts was also a lover of Zeus (Jupiter).
Orbit
The satellite orbits Jupiter at an average distance of 21,280,180 km in 634.19 days, at an inclination of 148° to the ecliptic with an eccentricity of 0.160. Its orbit is continuously changing due to solar and planetary perturbations.
It belongs to the Ananke group, made up a tightly of irregular retrograde moons orbiting Jupiter at a distance ranging between 19–22 million km, inclinations between 144 and 156°, and eccentricities between 0.10 and 0.30.
Physical characteristics
It is about 4 kilometres in diameter (assumed albedo 4%) [9] and appears grey (color index R-V=0.43), similar to C-type asteroids.[5]
Origin
Iocaste probably did not form near Jupiter but was captured by Jupiter later.Like the other members of the Ananke group, which have similar orbits, Iocaste is probably the remnant of a broken, captured heliocentric asteroid.[10][11]
References
- ^ a b 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)
- ^ as 'Harpalyce', 'Harpalycus' in Noah Webster (1884) A Practical Dictionary of the English Language
- ^ a b "M.P.C. 127087" (PDF). Minor Planet Circular. Minor Planet Center. 17 November 2020.
- ^ "Planetary Satellite Physical Parameters". Jet Propulsion Laboratory. 19 February 2015. Retrieved 26 November 2020.
- ^ a b Grav, T.; Holman, M. J.; Gladman, B. J.; and Aksnes, K.; Photometric Survey of the Irregular Satellites, Icarus, Volume 166 (2003), pages 33-45
- ^ Sheppard, Scott. "Scott S. Sheppard - Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. Retrieved 26 November 2020.
- ^ IAUC 7555: Satellites of Jupiter 5 January 2001 (discovery)
- ^ IAUC 7998: Satellites of Jupiter 22 October 2002 (naming the moon)
- ^ Sheppard, S. S.; Jewitt, D. C.; and 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, Volume 1, Cambridge, United Kingdom: Cambridge University Press, ISBN 0-521-81808-7, 2004, pages 263-280
- ^ Sheppard, S. S.; Jewitt, D. C.; "An Abundant Population of Small Irregular Satellites Around Jupiter" Archived August 13, 2006, at the Wayback Machine, Nature, Volume 423 (May 2003), pages 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, Volume 126 (2003), pages 398–429
- Ephemeris IAU-MPC NSES
- Mean orbital parameters NASA JPL