| Proper Name | Chaldene | | Designation | Jupiter XXI | | Primary Planet | Jupiter | | Family / Class | Carme Group | | Orbital Period | 2 years, 29 days (retrograde) | | Distance from Jupiter | Semi-Major Axis: 22,930,500 km (0.15 AU)
Periapsis: 16,854,000 km (0.11 AU)
Apoapsis: 29,007,000 km (0.19 AU) | | Eccentricity | 0.265 | | Rotation Period | Not known | | Mean Diameter | 4 km
2.5 miles | | Notes | One of some thirty outer moons of Jupiter that seem to have formed following the capture of a small asteroid by Jupiter's gravity. The main mass of that asteroid survives as the 47-kilometre moon Carme, while the rest of the group (like Chaldene) represent much smaller fragments left over from the event, following similar inclined, retrograde orbits to the primary moon of their group. |
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