Ananke (moon)
Ananke (/əˈnæŋki/) is a retrograde irregular moon of Jupiter. It was discovered by Seth Barnes Nicholson at Mount Wilson Observatory in 1951 and is named after the Greek mythological Ananke, the personification of necessity, and the mother of the Moirai (Fates) by Zeus. The adjectival form of the name is Anankean.
Ananke photographed by the Haute-Provence Observatory in August 1998 | |
| Discovery | |
|---|---|
| Discovered by | Seth B. Nicholson |
| Discovery site | Mt. Wilson Observatory |
| Discovery date | 28 September 1951 |
| Designations | |
Designation | Jupiter XII |
| Pronunciation | /əˈnæŋkiː/ |
Named after | Ἀνάγκη Anagkē |
| Adjectives | Anankean /ænəŋˈkiːən/ |
| Orbital characteristics | |
| Epoch 17 December 2020 (JD 2459200.5) | |
| Observation arc | 69.05 yr (24,338 days) |
| 0.1406602 AU (21,042,470 km) | |
| Eccentricity | 0.1747248 |
| –623.59 d | |
| 339.61045° | |
| 0° 34m 38.281s / day | |
| Inclination | 148.67482° (to ecliptic) |
| 86.44368° | |
| 135.63033° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
Mean diameter | 29.1±0.6 km |
| 8.31±0.15 h | |
| Albedo | 0.038±0.006 |
| 18.9 | |
| 11.7 | |
Ananke did not receive its present name until 1975; before then, it was simply known as Jupiter XII. It was sometimes called "Adrastea" between 1955 and 1975 (Adrastea is now the name of another satellite of Jupiter).
Ananke gives its name to the Ananke group, retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 Gm, at inclinations of roughly 150°.
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