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Harpalyke or Jupiter XXII, is a non-spherical moon of Jupiter. It was found by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2000, and given the designation S/2000 J 5. In August 2003,the moon was named after Harpalyke, the incestuous daughter of Klymenos, who was in some accounts a lover of Zeus (Jupiter).
Harpalyke belongs to the Ananke group, believed to be the remnants of a break-up of a captured asteroid. It is about 4 kilometres in diameter and appears grey similar to C-type asteroids. The moon 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 orbital eccentricity of 0.2441.
- IAUC 7555: Satellites of Jupiter 2001 January 5 (discovery)
- MPEC 2001-A28: S/2000 J 2, S/2000 J 3, S/2000 J 4, S/2000 J 5, S/2000 J 6 2001 January 5 (discovery and ephemeris)
- IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)
- Sheppard, S. S.; and Jewitt, D. C.; An Abundant Population of Small Irregular Satellites Around Jupiter, 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.; and Porco, C. C.; Jupiter's Outer Satellites and Trojans, in Jupiter: The Planet, Satellites and Magnetosphere, edited by Fran Bagenal, Timothy E. Dowling, 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.; and Aksnes, K.; Photometric Survey of the Irregular Satellites, Icarus, Vol. 166 (2003), pp. 33-45