Ananke group
The Ananke group is a group of retrograde irregular satellites of Jupiter that follow similar orbits to Ananke and are thought to have a common origin.
Their semi-major axes (distances from Jupiter) range between 19.2 and 21.8 million km, their orbital inclinations between 144.3° and 155.5°, and their orbital eccentricities between 0.09 and 0.30.
The members of the Ananke group are (in order of date announcement):
| Name | Diameter (km) |
Semi-Major Axis (km) |
Period (days) |
|---|---|---|---|
| Ananke | 28 | 21029500 | –623.11 |
| Iocaste | 5 | 21062300 | –624.55 |
| Harpalyke | 4 | 20887500 | –616.78 |
| Praxidike | 7 | 20931100 | –618.72 |
| Thyone | 4 | 20972700 | –620.59 |
| Hermippe | 4 | 21103600 | –626.38 |
| Euanthe | 3 | 20822900 | –613.93 |
| Orthosie | 2 | 20897800 | –617.23 |
| Euporie | 2 | 19261900 | –546.18 |
| S/2003 J 2 | 2 | 20992900 | –621.47 |
| Eupheme | 2 | 20763400 | –611.32 |
| Helike | 4 | 20911400 | –617.86 |
| S/2003 J 12 | 1 | 20959300 | –619.96 |
| S/2003 J 16 | 2 | 20877500 | –622.88 |
| S/2003 J 18 | 2 | 20332800 | –592.33 |
| Mneme | 2 | 20815800 | –613.61 |
| Thelxinoe | 2 | 20972300 | –620.55 |
| S/2010 J 2 | 1 | 20786900 | –612.35 |
| S/2016 J 1 | 1 | 20796700 | –612.78 |
| S/2017 J 3 | 2 | 20936500 | –618.97 |
| S/2017 J 7 | 2 | 20960400 | –620.02 |
| S/2017 J 9 | 3 | 21764200 | –656.05 |
| S/2021 J 1 | 1 | 20954700 | –619.77 |
| S/2021 J 2 | 1 | 20926600 | –618.50 |
| S/2021 J 3 | 2 | 20776600 | –611.87 |
| S/2022 J 3 | 1 | 21015100 | –622.44 |
| S/2017 J 10 | 2 | 21075800 | –625.15 |
The International Astronomical Union (IAU) reserves names ending in -e for all retrograde moons, including this group's members.