What is Callirrhoe (moon)?
'''Callirrhoe''' or '''{{nowrap|Jupiter XVII}}''', is one of [[Jupiter (planet)|Jupiter]]'s farthest named [[List of Jupiter's moons|moons]]. It was found by [[Spacewatch]] on October 6, 1999 and originally designated as an [[asteroid]] ({{mp|1999 UX|18}}).<ref>MPS 7418 (Minor Planet Circulars Supplement); not available on-line</ref> It was found to be in orbit around Jupiter by [[Timothy B. Spahr|Tim Spahr]] on July 18, 2000, and then given the designation '''{{nowrap|S/1999 J 1}}'''.<ref>[http://cfa-www.harvard.edu/iauc/07400/07460.html IAUC 7460: ''S/1999 J 1''] 2000 July 20 (discovery)</ref><ref>[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)</ref> Callirrhoe is about 8.6 kilometres in diameter, and orbits Jupiter at an average distance of 24,356,000&nbsp;km in 776.543 days, at an [[inclination]] of 141° to the [[ecliptic]] (140° to Jupiter's equator), with an [[orbital eccentricity]] of 0.264. It was named in October 2002 after [[Callirhoe]], daughter of the river god [[Achelous]], one of [[Zeus]]' (Jupiter's) many conquests.<ref>[http://cfa-www.harvard.edu/iauc/07900/07998.html IAUC 7998: Satellites of Jupiter] 2002 October 22 (naming the moon)</ref> It belongs to the [[Pasiphaë group]], non-[[Sphere|spherical]] retrograde moons orbiting Jupiter at distances ranging between 22,800,000 and 24,100,000&nbsp;km, and with [[inclination]]s ranging between 144.5° and 158.3°. As a navigation exercise, the [[New Horizons]] spacecraft imaged it on January 10, 2007. == References == {{reflist}} {{Moons of Jupiter}} {{sci-stub}} [[Category:Jupiter's moons]]