Nereid in 3D: live position and orbit

A small, distant moon with the second-most eccentric orbit of any known moon, likely a captured object rather than one formed alongside Neptune.Nereid is shown at its real position, computed from NASA/JPL ephemeris data. The view opens on Nereid; you can travel in time, switch between the educational overview and the true-scale voyage, and compare it with every other body of the solar system.

Orbits

Neptune

Radius

170 km (± 15 %)¹

Mean distance from Neptune

5 513 400 km²

Orbital period

360 days²

Rotation period

11.59 hours³

Missions

Voyager

Sources

NASA JPL Solar System Dynamics, Planetary Satellite Physical Parameters. read 2026-09-17. https://ssd.jpl.nasa.gov/sats/phys_par/

NASA NSSDCA, Planetary and Satellite Fact Sheets. read 2026-09-17. https://nssdc.gsfc.nasa.gov/planetary/planetfact.html

Kiss et al., Nereid from space: Rotation, size and shape analysis from Kepler/K2, Herschel and Spitzer observations. Monthly Notices of the Royal Astronomical Society. 2016. read 2026-09-17. https://arxiv.org/abs/1601.02395

3D Solar System

Galaxy

01 / 06 Initializing...

Display settings

In the scene

Preset

A column header sets the whole column, a group row its group, a row one object. Spacecraft and interstellar objects start hidden.

What the scene shows, object by object
Object	Label	Object	Orbit

Asteroid and comet field

Drawn in Exploration mode, one dot per known orbit.

Rendering

Accessibility and units

Offline use

Download every ephemeris file so the app can place the bodies at any date without a network. Nothing is downloaded until you ask.

Navigation

Drag orbit the view
Scroll · pinch zoom in / out
Click a body or its label to travel to it
Educ · Explo compressed overview vs true-scale voyage
Clock · date scroll to time-travel, tap to pick
Space play / pause time
/ search a body
T back to now
F full screen
M switch Educ / Explo
? show this help

Textures: USGS Astrogeology / NASA-JPL (public domain) · Solar System Scope (CC BY 4.0) · NOAA ETOPO 2022 · Halley, Itokawa, Gaspra, Ida: Philip Stooke / NASA PDS · Ryugu: ISAS/JAXA Hayabusa2 ONC (modified) · Lutetia, 67P: ESA/Rosetta OSIRIS, ESA, H. Sierks (CC BY-NC 3.0 IGO, modified).
Illustrative surfaces: Bodies never mapped globally have an illustrative texture, not a scientific map; the body card says so, and Sources lists them.
3D shape models: NASA PDS: NEAR (Eros), Hayabusa (Itokawa), Galileo (Ida, Gaspra) · ISAS/JAXA: Hayabusa2 (Ryugu) · NASA/Goddard SVS: OSIRIS-REx (Bennu)
Data: Astronomy Engine · NASA/JPL Horizons · JPL SBDB · NASA GIBS · NOAA NCEP GFS · NASA Planetary Data System (mission context products) · IAU Gazetteer of Planetary Nomenclature · Open-Meteo.com (CC BY 4.0) · ERA5, Copernicus Climate Change Service (ECMWF)