Callirrhoe (moon)

Callirrhoe (pron-en|kəˈlɪroʊi "kə-LIRR-oh-ee," or as in Greek "Καλλιρρόη)," also known as nowrap|Jupiter XVII, is one of Jupiter's outermost named natural satellites. It was discovered by Spacewatch on October 6, 1999 and originally designated as an asteroid (mp|1999 UX|18). [MPS 7418 (Minor Planet Circulars Supplement); not available on-line] It was discovered to be in orbit around Jupiter by Tim Spahr on July 18, 2000, and then given the designation nowrap|S/1999 J 1. [ [http://cfa-www.harvard.edu/iauc/07400/07460.html IAUC 7460: "S/1999 J 1"] 2000 July 20 (discovery)] [ [http://cfa-www.harvard.edu/mpec/K00/K00Y16.html MPEC 2000-Y16: "S/1975 J 1 = S/2000 J 1, S/1999 J 1"] 2000 December 19 (discovery and ephemeris)]

Callirrhoe is about 8.6 kilometers in diameter, and orbits Jupiter at an average distance of 24.356 million kilometers in 776.543 days, at an inclination of 141° to the ecliptic (140° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.264.

It was named in October 2002 after Callirrhoe, daughter of the river god Achelous, one of Zeus' (Jupiter's) many conquests. [ [http://cfa-www.harvard.edu/iauc/07900/07998.html IAUC 7998: Satellites of Jupiter] 2002 October 22 (naming the moon)]

It belongs to the Pasiphaë group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 and 24.1 million kilometers, and with inclinations ranging between 144.5° and 158.3°.

As a navigation exercise, the New Horizons spacecraft imaged it on January 10, 2007.

References

* [http://callirrhoe.com/ Callirrhoe]

External links

[http://www.nineplanets.org/1999j1.html Spacewatch discovery picture]