Polydeuces

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Polydeuces
Polydeuces is a small natural satellite of Saturn that is co-orbital with the moon Dione and librates around its trailing Lagrangian point (L5). Dione's other co-orbital moon is Helene, which is bigger and located at the leading L4 point. The name Polydeuces was approved by the IAU Working Group on Planetary System Nomenclature on January 21, 2005. In Greek mythology, Polydeuces is another name for Pollux, twin brother of Castor, son of Zeus and Leda. Due to gravitational interactions with Dione, its surface may be in hydrostatic equilibrium but not its interior, similar to Methone being in hydrostatic equilibrium due to interactions with Mimas. Polydeuces (moon) - Wikipedia, the free encyclopedia
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Short Description Polydeuces is a small natural satellite of Saturn that is co-orbital with the moon Dione and librates around its trailing Lagrangian point (L5). Dione's other co-orbital moon is Helene, which is bigger and located at the leading L4 point. The name Polydeuces was approved by the IAU Working Group on Planetary System Nomenclature on January 21, 2005. In Greek mythology, Polydeuces is another name for Pollux, twin brother of Castor, son of Zeus and Leda. Due to gravitational interactions with Dione, its surface may be in hydrostatic equilibrium but not its interior, similar to Methone being in hydrostatic equilibrium due to interactions with Mimas. Polydeuces (moon) - Wikipedia, the free encyclopedia
Discovered by Cassini Imaging Science Team
Discovery date October 24, 2004
Type Moon
AddInfo Saturn XXXIV / Dione C
Satellite of Saturn
Orbit Prograde
Rotation Synchronous
Shape Equilibrium spheroid
Apoapsis 06 377 396 km
Periapsis 06 377 396 km
Semi-major axis 06 377 396 km
Distance from Sun 01 9.554 909 au /18b
Eccentricity 0.019 2 
Orbital period 2.736 915 days
Orbital speed 02 10.0 km/s
Inclination to the equator 000.177 4
Diameter/Size 01 2.6 km
Dimensions 3 × 2.5 × 2 km
Mass 1013×1 ÷ 5 kg
Density  0.5 g/cm3
Surface gravity  0,000 18 m/s2
Escape velocity  0.6 m/s
Rotation period 2.736 915 days
Apparent magnitude 25
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