The irregularly shaped third
moon of
Neptune, discovered by
Voyager 2 in
1989.
Equatorial radius ................. 74 km
Diameter .......................... 148 km
Mean distance from Neptune ........ 52,500 km
Orbital period .................... 0.334655 days
Mean orbital velocity ............. 11.41 km/sec
Orbital inclination ............... 0.07 degrees
Orbital eccentricity .............. 0.0001
Visual geometric albedo ........... 0.06
Visual magnitude from earth ....... 22.6
Mass, mean density, and rotational period are unknown.
The moons of Neptune: Naiad, Thalassa, Despina, Galatea, Larissa, Proteus, Triton, and Nereid.