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'''Helene''' is a [[natural satellite|moon]] of [[Saturn (planet)|Saturn]]. It was discovered by [[Pierre Laques]] and [[Jean Lecacheux]] in [[1980]] from ground-based observations at [[Pic du Midi Observatory]], and was designated '''1980 S 6'''. In [[1988]] it was officially named after [[Helene (mythology)|Helene]] of [[Greek mythology]]. |
'''Helene''' is a [[natural satellite|moon]] of [[Saturn (planet)|Saturn]]. It was discovered by [[Pierre Laques]] and [[Jean Lecacheux]] in [[1980]] from ground-based observations at [[Pic du Midi Observatory]], and was designated '''1980 S 6'''. In [[1988]] it was officially named after [[Helene (mythology)|Helene]] of [[Greek mythology]]. |
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The name Helene has three syllables in English, but the placement of the accent is disputed. JPL sites generally have [he-LEE-nee], whereas traditional mythology has [HELL- |
The name Helene has three syllables in English, but the placement of the accent is disputed. JPL sites generally have [he-LEE-nee], whereas traditional mythology has [HELL-uh-nee], parallel to Helenus. An example of the latter is the ''Dictionary of Classical Mythology'' (JE Zimmerman, Harper & Row, 1964). |
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It is co-orbital with [[Dione (moon)|Dione]] and located in its leading [[Lagrangian point]] (L<sub>4</sub>) and hence, before it received its permanent name of "Helene" it was usually referred to as "Dione B". |
It is co-orbital with [[Dione (moon)|Dione]] and located in its leading [[Lagrangian point]] (L<sub>4</sub>) and hence, before it received its permanent name of "Helene" it was usually referred to as "Dione B". |
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| Discovery | |
|---|---|
| Discovered by | Laques and Lecacheux |
| Discovered in | 1980 |
| Orbital characteristics | |
| Semimajor axis | 377,400 km |
| Eccentricity | 0.0022 |
| Orbital period | 65h 41m 05s |
| Inclination | 0.02° |
| Satelliteof | 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 | ? |
| Axial tilt | ?° |
| Albedo | ? |
| Surface temperature | ?K |
| Atmosphere | none |
Helene is a moonofSaturn. It was discovered by Pierre Laques and Jean Lecacheuxin1980 from ground-based observations at Pic du Midi Observatory, and was designated 1980 S 6. In 1988 it was officially named after HeleneofGreek mythology.
The name Helene has three syllables in English, but the placement of the accent is disputed. JPL sites generally have [he-LEE-nee], whereas traditional mythology has [HELL-uh-nee], parallel to Helenus. An example of the latter is the Dictionary of Classical Mythology (JE Zimmerman, Harper & Row, 1964).
It is co-orbital with Dione and located in its leading Lagrangian point (L4) and hence, before it received its permanent name of "Helene" it was usually referred to as "Dione B".
