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Prometheus

Supposedly Prometheus is made of ice because it's very lightweight and bright for its size. It lies inside of Saturn's F ring and by its gravitation pulls on this.

Distance to Saturn: 139 350 km
Mass: 3.3 * 1017 kg
Diameter: 86 km
Orbit period: 0.614 days

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Prometheus and the slightly dented F ring.
Photo: NASA/JPL/SSI
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