Space · Moons
S/2021 N 1
A moon of Neptune — Neptune's most recently-discovered moon — extreme retrograde orbit.
Quick facts
Parent planet
Diameter (mean)
14 km
Mass
1.5 × 10¹⁵ kg
2e-08 Moon masses
Mean orbital radius
50,300,000 km
Orbital period
9750 Earth days
Discovery year
2021
Discoverer
Scott S. Sheppard et al. (announced 2024)
Naming origin
Provisional designation — formal name pending
Surface conditions
S/2021 N 1 is a small, faint retrograde outer moon of Neptune in an extreme orbit. Confirmed and announced in 2024 alongside S/2002 N 5.
Missions and observations
Every Neptune-system mission has had an opportunity to image or characterize S/2021 N 1. The list below is the Neptune-system mission catalog; specific S/2021 N 1 encounters are documented in mission archives.
| Mission | Year at Neptune | Status |
|---|---|---|
|
Voyager 2 NASA |
1989 | Completed |
Naming etymology
Provisional designation pending a formal Greek sea-figure name from the IAU.
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.