Callirrhoe (moon)

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Callirrhoe (kə-lirr'-oe-ee, IPA: /kəˈlɪrəʊi/; Greek Καλλιρρόη), or 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 (1999 UX₁₈).^[1] It was discovered to be in orbit around Jupiter by Tim Spahr on July 18, 2000, and then given the designation S/1999 J 1.^[2]^[3]

Callirrhoe is about 8.6 kilometres in diameter, and orbits Jupiter at an average distance of 24,356 Mm 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 Callirhoe, daughter of the river god Achelous, one of Zeus' (Jupiter's) many conquests.^[4]

It belongs to the Pasiphaë group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 and 24.1 Gm, 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

^ MPS 7418 (Minor Planet Circulars Supplement); not available on-line
^ IAUC 7460: S/1999 J 1 2000 July 20 (discovery)
^ MPEC 2000-Y16: S/1975 J 1 = S/2000 J 1, S/1999 J 1 2000 December 19 (discovery and ephemeris)
^ IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)

v • d • e

Moons of Jupiter

Listed in increasing distance from Jupiter. Temporary names in italics.

Inner moons

Metis · Adrastea · Amalthea · Thebe

Galilean moons

Io · Europa · Ganymede · Callisto

Themisto

Himalia group

Leda · Himalia · Lysithea · Elara · S/2000 J 11

Carpo · S/2003 J 12

Ananke group

core	Ananke · Praxidike · Harpalyke · Iocaste · Euanthe · Thyone
peripheral	Euporie · S/2003 J 3 · S/2003 J 18 · Thelxinoe · Helike · Orthosie · S/2003 J 16 · Hermippe · Mneme · S/2003 J 15

Carme group

S/2003 J 17 · S/2003 J 10 · Pasithee · Chaldene · Arche · Isonoe · Erinome · Kale · Aitne · Taygete · S/2003 J 9 · Carme · S/2003 J 5 · S/2003 J 19 · Kalyke · Eukelade · Kallichore

Pasiphaë group