Callirrhoe (moon)
Callirrhoe (/kəˈlɪroʊ.iː/; 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, and originally designated as asteroid 1999 UX18. 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. It was the 17th confirmed moon of Jupiter.
This discovery image of Callirrhoe taken by Spacewatch in October 1999 | |
| Discovery | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak National Observatory |
| Discovery date | 19 October 1999 |
| Designations | |
Designation | Jupiter XVII |
| Pronunciation | /kəˈlɪroʊiː/ |
Named after | Καλλιρρόη Kallirrhoê |
Alternative names | S/1999 J 1 1999 UX18 |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Observation arc | 17.54 yr (6,406 days) |
Semi-major axis | 0.1643278 AU (24,583,090 km) |
| Eccentricity | 0.3095704 |
Orbital period (sidereal) | –787.43 d |
Mean anomaly | 240.90203° |
Mean motion | 0° 27m 25.866s / day |
| Inclination | 147.99790° (to ecliptic) |
Longitude of ascending node | 352.75480° |
| 68.21981° | |
| Satellite of | Jupiter |
| Group | Pasiphae group |
| Physical characteristics | |
Mean diameter | 9.6±1.3 km |
| Albedo | 0.052±0.016 |
| 20.8 | |
| 13.92±0.02 | |
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