Callirrhoe (moon)
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Callirrhoe (Template:IPAc-en; Greek: Καλλιρρόη), also known as Jupiter XVII, is one of Jupiter's outermost natural satellites.
Discovery and Naming
Callirrhoe was imaged by Spacewatch at Kitt Peak National Observatory from October 6 through November 4, 1999,[1] and originally designated as asteroid Template:Mp.[2][3] 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.[4][5] It was the 17th confirmed moon of Jupiter.[1]
It was named in October 2002 after Callirrhoe, daughter of the river god Achelous, one of Zeus's (Jupiter's) many conquests.[6]
Orbit
Callirrhoe orbits Jupiter (at an average distance of 23.3 million km) on a high-eccentricity (0.33) and high-inclination (147° to ecliptic) retrograde orbit.[7] The orbital elements are continuously changing due to solar and planetary perturbations.
It belongs to the Pasiphae group, a group of retrograde moons jupiters with semi-major axes spread over 22–25 million km, inclinations between 141° and 158°, and higher eccentricities between 0.22 and 0.44.
Physical characteristics
Callirrhoe has an apparent magnitude of 20.8,[8] making it even fainter than dwarf planet Eris at magnitude 18.7.[9] Jupiter is about 2.1 billion times brighter than Callirrhoe.Template:Efn
Callirrhoe's measured albedo is around 5,2%, which means its diameter is 9,6 kilometers. [10]
While Pasiphae belongs to the grey color class (V=17.22 B−V=0.74, V−R=0.38), Callirrhoe falls under the light red color class (V=21.39 B−V=0.72, V−R=0.50), similarly to Megaclite and Sinope.[11]
Origin
Callirrhoe probably did not form near Jupiter but was captured by Jupiter later. Callirrhoe is believed to be a fragment from a captured asteroid along with other Pasiphae group satellites.[12][13]
However, it falls into a different color class than Pasiphae and could therefore have been captured by Jupiter independently of the Pasiphae group.
Exploration
As a navigation exercise, the New Horizons spacecraft imaged Callirrhoe on January 10, 2007.[14]
Notes
References
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- ↑ MPS 7418 (Minor Planet Circulars Supplement); not available on-line
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- ↑ MPEC 2000-Y16: S/1975 J 1 = S/2000 J 1, S/1999 J 1 2000-12-19 (discovery and ephemeris)
- ↑ IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Sheppard, S. S.; and Jewitt, D. C.; An Abundant Population of Small Irregular Satellites Around Jupiter Template:Webarchive, Nature, Vol. 423 (May 2003), pp. 261-263
- ↑ Script error: No such module "citation/CS1".
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External links
- 17th Moon of Jupiter Discovered Template:Webarchive
- Spacewatch S/1999 J 1
- Spacewatch discovery picture
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