Quick facts
Parent planet
Diameter (mean)
62 km
Mass
1.6 × 10¹⁷ kg
2.2e-06 Moon masses
Mean orbital radius
16,611,000 km
Orbital period
1879.7 Earth days
Discovery year
2002
Discoverer
Matthew J. Holman et al.
Naming origin
One of the Nereids
Surface conditions
Halimede is a retrograde outer irregular moon of Neptune, about 62 km across. The color is similar to Nereid's, suggesting a possible common origin or composition.
Missions and observations
Every Neptune-system mission has had an opportunity to image or characterize Halimede. The list below is the Neptune-system mission catalog; specific Halimede encounters are documented in mission archives.
| Mission | Year at Neptune | Status |
|---|---|---|
|
Voyager 2 NASA |
1989 | Completed |
Naming etymology
Halimede was one of the 50 Nereid sea nymphs of Greek mythology. Adopted by the IAU in 2007.
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.