File:Cassini Helene N00051429 CL.png | |
Discovery | |
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Discovered by | Laques and Lecacheux |
Discovered in | March 1, 1980 |
Orbital characteristics | |
Semimajor axis | 377,396 km |
Eccentricity | 0.0022 |
Orbital period | 2.736915 d [1] |
Inclination | 0.199° (to Saturn's equator) |
Satellite of | Saturn |
Physical characteristics | |
Mean diameter | 32 km (36 × 32 × 30) |
Mass | ?kg |
Mean density | ? g/cm3 |
Surface gravity | ?m/s2 |
Escape velocity | ?km/s |
Rotation period | assumed synchronous |
Axial tilt | zero |
Albedo | ? |
Surface temperature | ? K |
Atmosphere | none |
Helene (hel'-e-nee, sometimes he-lee'-nee, /ˈhɛləni/, /həˈliːni/, Greek Ἑλένη) is a moon of Saturn. It was discovered by Pierre Laques and Jean Lecacheux in 1980 from ground-based observations at Pic du Midi Observatory, and was designated S/1980 S 6. In 1988 it was officially named after Helen of Troy, who was the granddaughter of Cronus (Saturn) in Greek mythology. The moon is also designated Saturn XII.
It is co-orbital with Dione and located in its leading Lagrangian point (L4) and hence, before it received its permanent name it was usually referred to as Dione B.
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External links[]
edit Saturn's natural satellites |
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Pan | Daphnis | Atlas | Prometheus | S/2004 S 6 | S/2004 S 4 | S/2004 S 3 | Pandora | Epimetheus and Janus |
Mimas | Methone | Pallene | Enceladus | Telesto, Tethys, and Calypso | Polydeuces, Dione, and Helene | Rhea |
Titan | Hyperion | Iapetus | Kiviuq | Ijiraq | Phoebe | Paaliaq | Skathi | Albiorix | S/2004 S 11 | Erriapo | Siarnaq |
S/2004 S 13 | Tarvos | Mundilfari | S/2004 S 17 | Narvi | S/2004 S 15 | S/2004 S 10 | Suttungr | S/2004 S 12 |
S/2004 S 18 | S/2004 S 9 | S/2004 S 14 | S/2004 S 7 | Thrymr | S/2004 S 16 | Ymir | S/2004 S 8 |
See also: Pronunciation key | Rings of Saturn | Cassini-Huygens | Themis |