Saturn’s narrow F ring and its two tiny moons, Prometheus and Pandora, may be the product of a collision at the outer edge of the planet’s main ring system, according to a study published online in Nature Geoscience.

Does Saturn's rings contain shepherd moons?

Prometheus and Pandora, two of Saturn’s more than 60 moons, flank the F ring on either side, weaving inside and outside the ring. These moons apparently act like shepherds, herding the flock of icy particles making up the F ring into a narrow band about 60 miles (100 km) wide.

Which of Saturn's moons are known as shepherd moons?

They have the effect of sculpting the rings: giving them sharp edges, and creating gaps between them. Saturn’s shepherd moons are Pan (Encke gap), Daphnis (Keeler gap), Atlas (A Ring), Prometheus (F Ring) and Pandora (F Ring).