Callirrhoe (moon)
Spacewatch image from 1999
|
|
| Discovery[2] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Observatory[1] |
| Discovery date | Oct-Nov 1999 |
| Designations | |
| S/1999 J 1[2] 1999 UX18[2][3] |
|
| Orbital characteristics[4] | |
| 24,099,000 km | |
| Eccentricity | 0.2796 |
| 758.82 d (2.1 yr) | |
| 107.962° | |
| Inclination | 147.080° |
| 283.104° | |
| 23.909° | |
| Satellite of | Jupiter |
| Physical characteristics | |
| Dimensions | ~8.6 km[5] |
| Albedo | 0.04 (assumed) |
| 20.7[5] | |
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Callirrhoe (/kəˈlɪroʊʊiː/ kə-LIRR-o-ee; Greek: Καλλιρρόη), also known as Jupiter XVII (17), is one of Jupiter's outermost named 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,[1] 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.[2][7] It was the 17th confirmed moon of Jupiter.[1]
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.[1]
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 it on January 10, 2007.[11]
References
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- ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 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)
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (5th root of 100)^(20.7-(-2.8))=2.51 billion
- ↑ IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)
- ↑ http://www.planetary.org/blogs/emily-lakdawalla/2007/jupiter_timeline.html
