Reference image
Object guide
Nereid is a small, irregular moon with a highly eccentric orbit around Neptune, possibly a captured Kuiper Belt object. Nereid is approximately 340 km across.
How to observe Nereid
Nereid is resolved as a separate world mainly through imaging or spacecraft data; visually, its relationship to neptune is the key observing context.
Scientific context
Useful scale comparisons are 0.027 Earth diameters, 0.003 g surface gravity, 0.986 Earth years per orbit. These values are rounded from the catalogue measurements shown on this page.
- Radius
- 170 km
- Diameter
- 340 km
- Mass
- 3,100,000,000,000,000,000 kg
- Mean density
- 0.151 g/cm³
- Surface gravity
- 0.03 m/s² (0.003 g)
- Orbital period
- 360.14 days (0.986 years)
- Parent body
- neptune
0.027 Earth diameters0.003 g surface gravity0.986 Earth years per orbit
Source: NASA Science (checked 2026-08-09). Values are rounded catalogue measurements.
Interactive orbit model
Aug 13, 2026, 22:251×
Calculated positions / separate exploration scales