Helene is a moon of Saturn, discovered by Laques and Lecacheux in 1980 from ground-based observations. It is co-oribtal with Dione and located in its leading Lagrangian point (L4) and hence is sometimes referred to as "Dione B".
- Orbital radius: 377,400 km
- Diameter: 33 km (36 x 32 x 30)
- Mass: Unknown
- Orbital period: 2.7369 days
- Orbital inclination: 0.2°