Helene_(moon) Helene_(moon)

Helene (moon) - Definition and Overview

Helene
image:Helene moon.jpg
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°
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  ?
Axial tilt  ?°
Albedo  ?
Surface temperature  ? K
Atmosphere none

Helene ("HELL en ee" or "hel LEE nee") 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 1980 S 6. In 1988 it was officially named after Helene of Greek mythology.

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".

... | Telesto, Tethys, Calypso | Polydeuces, Dione, Helene | Rhea | ...


Saturn
Janus' group | Mimas | Enceladus | Tethys | Dione | Rhea
Titan | Hyperion | Iapetus | Siarnaq's group | Phoebe's group
(For other moons, see: Saturn's natural satellites)
see also: Cassini-Huygens


Example Usage of Helene

laurentk: @laslavia Merci Marie Hélène, malheureusement ce n'est pas ca ... Je cherche !
rmnschlager: Now Playing: Helene Fischer - Du Läßt Mich Sein, So Wie Ich Bin
JUKreiz: Frauen als Opfer: "16 Tage gegen Gewalt an Frauen". Helene Voglreiter hat das Gewaltschutzzentrum Steiermark be.. http://tinyurl.com/ybnhq4a
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