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Jupiter XXI

Proper NameChaldene
DesignationJupiter XXI
Primary PlanetJupiter
Family / ClassCarme Group
Orbital Period2 years, 29 days (retrograde)
Distance from JupiterSemi-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)
Rotation PeriodNot known
Mean Diameter4 km
2.5 miles
NotesOne 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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