Rings and moons

Cassini spacecraft image of Rhea, Prometheus and Saturn's rings.

Cassini spacecraft image of Rhea, Prometheus and Saturn's rings.

  • Rhea & Prometheus
  • Saturn’s rings seen edge-on
  • Images by the Cassini spacecraft

From just below the plane of Saturn’s thin rings, the Cassini spacecraft took this image of the rings edge-on with the planet’s second largest moon, Rhea, beyond.

Although Rhea may appear to be in the foreground of this image, it isn’t. The rings are closer. The small moon Prometheus, orbiting between the A ring and the thin F ring, is also visible within the rings near the upper middle of the image.

This view looks toward the Saturn-facing side of Rhea (1,528 kilometres wide) and the leading hemisphere of Prometheus (86 kilometres wide). This view looks toward the southern, unilluminated side of the rings from just below the ringplane.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on January 31, 2010. The view was obtained at a distance of approximately 2.5 million kilometres from Rhea and approximately 2 million kilometres from Prometheus. Image scale is 15 kilometres per pixel on Rhea and 12 kilometres per pixel on Prometheus.

Adapted from information issued by NASA / JPL / Space Science Institute.

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