Space · Moons

Praxidike

A moon of Jupiter — An Ananke-group retrograde found in the 2000 Mauna Kea survey.

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Quick facts

Parent planet

Jupiter

Diameter (mean)

7 km

Mass

4.3 × 10¹⁴ kg
5.9e-09 Moon masses

Mean orbital radius

21,148,000 km

Orbital period

625.3 Earth days

Discovery year

2000

Discoverer

Scott S. Sheppard et al.

Naming origin

Greek goddess of justice and punishment

Surface conditions

Praxidike is a small 7-km retrograde irregular in the Ananke group, discovered in the same 2000 Mauna Kea survey that produced ten other Jovian outer moons.

Missions and observations

Every Jupiter-system mission has had an opportunity to image or characterize Praxidike. The list below is the Jupiter-system mission catalog; specific Praxidike encounters are documented in mission archives.

Mission	Year at Jupiter	Status
Pioneer 10 NASA	1973	Completed
Pioneer 11 NASA	1974	Completed
Voyager 1 NASA	1979	Completed
Voyager 2 NASA	1979	Completed
Ulysses NASA/ESA	1992	Completed
Galileo NASA	1995	Completed
Cassini-Huygens NASA/ESA/ASI	2000	Completed
New Horizons NASA	2007	Completed
Juno NASA	2016	Active
Europa Clipper NASA	2030	On the way
JUICE ESA	2031	On the way

Naming etymology

Praxidike was the Greek goddess of justice and punishment, daughter of Zeus. The IAU adopted the name in 2003.

Methodology & sources

Diameter, mass, and orbital parameters from JPL Solar System Dynamics — Physical Parameters. Discovery year and discoverer from the JPL Satellite Discovery Circumstances. Naming etymology from the IAU Working Group for Planetary System Nomenclature. Stylized SVG hero composed from NASA / JPL imagery as visual reference; no photographs are reproduced.