Saturn · natural satellite

Helene

Mean diameter: 36 km
Mean orbital distance: 377,600 km from centre
Orbital period: 2.737 Earth days

Compared with our Moon

Helene · 36 km

Moon · 3,474.8 km

One diameter scale. Circle shapes compare volume-equivalent diameters; irregular moons are not spheres.

Orbit & discovery

Surface gravity: 0.001 m/s²
Discovery: 1980
Discoverer / team: P. Laques and J. Lecacheux
Provisional designation: S/1980 S6
JPL satellite ID: 612
Orbital eccentricity: 0.007
Inclination: 0.2 degrees

Inclination reference: Laplace. Mean-element epoch: 2000-01-01.5 TDB · SAT441.

Diameters use volume-equivalent mean radii, including for irregular bodies. Mean orbital elements describe an orbit; they are not live positions. Missing physical measurements remain unavailable.

Physical measurements & uncertainties

Mean radius · km: 18.00 ±0.40 [1]
GM · km³/s²: 0.00048 ±0.00002 [SAT441]
Density · g/cm³: 0.2918 ±0.0217 [*]

Missions in the Saturn system · 5 records

5 launches · 0 linked events

These records cover the planetary system. A system mission did not necessarily visit this moon. Dedicated targets are marked separately; programme events include the journey and briefings. Launch outcomes do not establish arrival, landing success or present spacecraft operation.

Dedicated targets only

PLANETARY SYSTEM · UPCOMING