| Discovered By | W. Lassell |
| Date of Discovery | 1846 |
| Average Distance from Neptune | 354,760 km (metric) |
| Equatorial Radius | 1352 km (metric) |
| Mass | 21,400,000,000,000,000,000,000 kg (metric) |
| Orbit Period (Length of Year) | -5.8768541 Earth days |
| Orbital Eccentricity | 0.000016 |
| Orbital Inclination to Ecliptic | 157.345° |
