Callirrhoe (moon)

Callirrhoe
	Spacewatch image from 1999
Discovery
Discovered by	Spacewatch
Discovery site	Kitt Peak National Observatory
Discovery date	Oct-Nov 1999
Designations
Alternative names	S/1999 J 1; 1999 UX18
Orbital characteristics
Semi-major axis	24,099,000 km
Eccentricity	0.2796
Orbital period (sidereal)	758.82 d (2.1 yr)
Mean anomaly	107.962°
Inclination	147.080°
Longitude of ascending node	283.104°
Argument of perihelion	23.909°
Satellite of	Jupiter
Physical characteristics
Dimensions	~8.6 km
Albedo	0.04 (assumed)
Apparent magnitude	20.7

Callirrhoe (/kəˈlɪroʊˌiː/ kə-LIRR-o-ee; Greek: Καλλιρρόη), also known as Jupiter XVII, is one of Jupiter's outer natural satellites. It is an irregular moon that orbits in a retrograde direction. Callirrhoe was imaged by Spacewatch at Kitt Peak National Observatory from October 6 through November 4, 1999,^[2] and originally designated as asteroid (1999 UX₁₈).^[3]^[6] 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.^[1]^[7] It was the 17th confirmed moon of Jupiter.^[2]

Callirrhoe has an apparent magnitude of 20.7,^[5] making it even fainter than dwarf planet Eris at magnitude 18.7.^[8] Jupiter is about 2.5 billion times brighter than Callirrhoe.^[9]

Callirrhoe is about 8.6 kilometers in diameter,^[5] and orbits Jupiter at an average distance of 24.1 million kilometers in 758 days, at an inclination of 141° to the ecliptic (140° to Jupiter's equator) with an eccentricity of 0.28. This object was probably captured long ago from a heliocentric orbit and the Sun's gravitational influence makes this orbit highly erratic.^[2]

It was named in October 2002 after Callirrhoe, daughter of the river god Achelous, one of Zeus' (Jupiter's) many conquests.^[10]

It belongs to the Pasiphae 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 Callirrhoe on January 10, 2007.^[11]

References

^ ^a ^b ^c ^d Brian G. Marsden (2000-07-20). "IAUC 7460: S/1999 J 1". IAU.
^ ^a ^b ^c ^d "New Outer Satellite of Jupiter Discovered". Minor Planet Center. Retrieved 2009-07-23.
^ ^a ^b "New moon of Jupiter found". SpaceFlight Now (University of Arizona News Release). Retrieved 2009-07-23.
^ Jacobson, R.A. (2013) JUP300 (2013-08-23). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2015-11-27.{{cite web}}: CS1 maint: numeric names: authors list (link)
^ ^a ^b ^c ^d "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 2009-04-03. Retrieved 2009-07-23.
^ MPS 7418 (Minor Planet Circulars Supplement); not available on-line
^ MPEC 2000-Y16: S/1975 J 1 = S/2000 J 1, S/1999 J 1 2000-12-19 (discovery and ephemeris)
^ "AstDys (136199) Eris Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2009-03-16.
^ (5th root of 100)^(20.7-(-2.8))=2.51 billion
^ IAUC 7998: Satellites of Jupiter^{[permanent dead link]} 2002 October 22 (naming the moon)
^ http://www.planetary.org/blogs/emily-lakdawalla/2007/jupiter_timeline.html

External links

[iauc7460-1] Brian G. Marsden (2000-07-20). "IAUC 7460: S/1999 J 1". IAU.

[pr-2] "New Outer Satellite of Jupiter Discovered". Minor Planet Center. Retrieved 2009-07-23.

[moon1999-3] "New moon of Jupiter found". SpaceFlight Now (University of Arizona News Release). Retrieved 2009-07-23.

[jpl-4] Jacobson, R.A. (2013) JUP300 (2013-08-23). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2015-11-27.{{cite web}}: CS1 maint: numeric names: authors list (link)

[jplssd-5] "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 2009-04-03. Retrieved 2009-07-23.

[6] MPS 7418 (Minor Planet Circulars Supplement); not available on-line

[7] MPEC 2000-Y16: S/1975 J 1 = S/2000 J 1, S/1999 J 1 2000-12-19 (discovery and ephemeris)

[Eris-AstDys-8] "AstDys (136199) Eris Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2009-03-16.

[9] (5th root of 100)^(20.7-(-2.8))=2.51 billion

[10] IAUC 7998: Satellites of Jupiter^{[permanent dead link]} 2002 October 22 (naming the moon)

[11] ttp://www.planetary.org/blogs/emily-lakdawalla/2007/jupiter_timeline.html

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v t e Moons of Jupiter
Listed in increasing approximate distance from Jupiter
Inner moons	Metis Adrastea Amalthea Thebe
Galilean moons	Io Europa Ganymede Callisto
Themisto	Themisto
Himalia group (9)	Leda Ersa S/2018 J 2 Himalia Pandia Lysithea Elara S/2011 J 3 Dia
Carpo group (2)	S/2018 J 4 Carpo
Valetudo	Valetudo
Ananke group (26)	Euporie Jupiter LV Eupheme S/2021 J 3 Jupiter LII Jupiter LIV Mneme Euanthe S/2003 J 16 Harpalyke Orthosie S/2022 J 3 Helike S/2021 J 2 Praxidike Jupiter LXIV S/2021 J 1 S/2003 J 12 Jupiter LXVIII Thelxinoe Thyone S/2003 J 2 Ananke Iocaste Hermippe Jupiter LXX
Carme group (30)	S/2022 J 1 S/2022 J 2 S/2016 J 3 Pasithee Jupiter LXIX S/2021 J 6 S/2003 J 24 Chaldene Jupiter LXIII Isonoe S/2021 J 4 Kallichore Erinome Kale Eirene Aitne Eukelade Arche Taygete Jupiter LXXII Carme Herse Jupiter LXI Jupiter LI S/2003 J 9 Jupiter LXVI Kalyke S/2018 J 3 S/2021 J 5 S/2003 J 10
Pasiphae group (18)	Philophrosyne Eurydome Jupiter LVI S/2003 J 4 S/2016 J 4 Jupiter LXVII Hegemone Pasiphae Sponde Megaclite Cyllene Sinope Jupiter LIX Aoede Autonoe Callirrhoe S/2003 J 23 Kore
See also	Rings of Jupiter Jupiter's moons in fiction
Category