Harpalyke (moon)

Harpalyke /hɑːrˈpælɪkiː/, also known as Jupiter XXII, 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, and given the temporary designation S/2000 J 5.[6][1] In August 2003, the moon was named[7] after Harpalyke, the incestuous daughter of Clymenus, who in some accounts was also a lover of Zeus (Jupiter).

Harpalyke
Harpalyke imaged by the Canada-France-Hawaii Telescope in December 2001
Discovery [1]
Discovered byScott S. Sheppard
David C. Jewitt
Yanga R. Fernandez
Eugene A. Magnier
Discovery siteMauna Kea Observatory
Discovery date23 November 2000
Designations
Designation
Jupiter XXII
Pronunciation/hɑːrˈpælɪkiː/[2]
Named after
Ἁρπαλύκη Harpălykē
S/2000 J 5
AdjectivesHarpalykean /hɑːrpəlɪˈkiːən/
Orbital characteristics [3]
Epoch 17 December 2020 (JD 2459200.5)
Observation arc17.39 yr (6,350 days)
0.1422492 AU (21,280,180 km)
Eccentricity0.1602677
–634.19 d
321.08380°
0° 34m 3.555s / day
Inclination148.29788° (to ecliptic)
92.54746°
193.28018°
Satellite ofJupiter
GroupAnanke group
Physical characteristics[4]
Mean diameter
4 km
Albedo0.04 (assumed)
22.2[5]
15.9[3]

    Harpalyke belongs to the Ananke group, believed to be the remnants of a break-up of a captured heliocentric asteroid.[8][9] It is about 4 kilometres in diameter[10] and appears grey (color index R-V=0.43), similar to C-type asteroids.[11] The satellite orbits Jupiter at an average distance of 21,064,000 km in 624.542 days, at an inclination of 147° to the ecliptic (147° to Jupiter's equator) with an eccentricity of 0.2441.

    References
    1. 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)
    2. as 'Harpalyce', 'Harpalycus' in Noah Webster (1884) A Practical Dictionary of the English Language
    3. "M.P.C. 127087" (PDF). Minor Planet Circular. Minor Planet Center. 17 November 2020.
    4. "Planetary Satellite Physical Parameters". Jet Propulsion Laboratory. 19 February 2015. Retrieved 26 November 2020.
    5. Sheppard, Scott. "Scott S. Sheppard - Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. Retrieved 26 November 2020.
    6. IAUC 7555: Satellites of Jupiter 5 January 2001 (discovery)
    7. IAUC 7998: Satellites of Jupiter 22 October 2002 (naming the moon)
    8. Sheppard, S. S.; and Jewitt, D. C.; An Abundant Population of Small Irregular Satellites Around Jupiter, 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.; 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, 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.; and 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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