Triton
Orbits Neptune backwards, which means it was captured rather than born there.
Where it is right now
Triton is in Pisces, 29.3 AU away.
Computed for 2 August 2026, 17:00 UTC, and recomputed at least hourly. This page is cached, so treat the line above as accurate to the hour rather than to the second. The map shows the live position.
Position from a Kepler propagation of the published elements below, accurate to about an arcminute.
Facts
Every line carries the source it came from.
- Mean radius
- 1352.6 kmSource: NASA/JPL Planetary Satellite Physical Parameters
- Orbits
- Neptune, 354,800 km out on averageSource: NASA/JPL Planetary Satellite Mean Elements
- Orbital period
- 5.88 daysSource: NASA/JPL Planetary Satellite Mean Elements
- Orbit shape
- eccentricity 0.0000, inclined 157.30 degrees to Neptune's Laplace planeSource: NASA/JPL Planetary Satellite Mean Elements
- Discovered
- 1846 by W. LassellSource: NASA/JPL Planetary Satellite Discovery Circumstances
- Direction
- retrograde, the only large moon in the solar system that orbits backwardsSource: NASA/JPL Planetary Satellite Mean Elements
Physical size
- Mean radius
- 1,353 km
- Diameter
- 2,705 km across
Orbit
Elements are relative to Neptune.
- Average distance from Neptune
- 354,800 km
- Eccentricity
- 0.0000, almost perfectly circular
- Inclination to Neptune's reference plane
- 130.24 degrees
- Orbital period
- 5.9 days
- Longitude of ascending node
- 216.55 degrees
- Argument of periapsis
- 16.12 degrees
- Mean anomaly at J2000.0
- 63.00 degrees
Family
Orbits Neptune.
Claim this body
$49 once, and it stays yours
Io, Europa, Titan, Triton and the rest. Sixteen exist, ever.
A claim is a listing on this map. Not an IAU designation. Permanent, with one disclosed exception for dead links: see the terms.
Catalog id triton. 3,172 objects on the map, of which 171 are hand-authored with sourced facts.