The shape of the small satellites of Saturn - Gravitational equilibrium VS solid-state strength

In the set of small satellites of Saturn recently imaged by the Voyager probes, the transition from irregularly-shaped, strength-dominated objects to larger, gravity-dominated bodies with shapes roughly fitting the theoretical equilibrium figures can be observed. The transition occurs for a radius of 100 + or - 50 km, corresponding to a typical material strength of the order of 10 million dynes/sq cm. The cases of Mimas, Enceladus, Hyperion, Phoebe and the small coorbital and F-ring shepherding moons are briefly discussed, showing that an analysis of the shape data can often provide interesting results on the physical properties, origin and collisional history of these objects.