Hyperion
Tumbles chaotically rather than rotating, the only sizeable moon known to do so.
Where it is right now
Hyperion is in Pisces, 8.97 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
- 135 kmSource: NASA/JPL Planetary Satellite Physical Parameters
- Orbits
- Saturn, 1,481,500 km out on averageSource: NASA/JPL Planetary Satellite Mean Elements
- Orbital period
- 21.3 daysSource: NASA/JPL Planetary Satellite Mean Elements
- Orbit shape
- eccentricity 0.1050, inclined 0.60 degrees to Saturn's Laplace planeSource: NASA/JPL Planetary Satellite Mean Elements
- Discovered
- 1848 by W.C Bond, G.P. Bond, W. LassellSource: NASA/JPL Planetary Satellite Discovery Circumstances
Physical size
- Mean radius
- 135 km
- Diameter
- 270 km across
Orbit
Elements are relative to Saturn.
- Average distance from Saturn
- 1.48 million km
- Closest and furthest
- 1.33 million km to 1.64 million km
- Eccentricity
- 0.1050, slightly elliptical
- Inclination to Saturn's reference plane
- 28.39 degrees
- Orbital period
- 21.3 days
- Longitude of ascending node
- 170.46 degrees
- Argument of periapsis
- 259.92 degrees
- Mean anomaly at J2000.0
- 122.90 degrees
Family
Orbits Saturn.
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Catalog id hyperion. 3,172 objects on the map, of which 171 are hand-authored with sourced facts.