Saturn hosts its own miniature solar system, with an entourage of more than 30 moons. This image shows Saturn's A and F rings, along with three of the moons that orbit close to them.
From innermost to outermost, tiny Atlas (30 kilometers, 19 miles across) orbits just outside of the bright A ring and is seen above center in this view. Prometheus (86 kilometers, 53 miles across) is visible near lower right and shepherds the thin, knotted F ring, along with its slightly smaller cohort Pandora. Finally, Janus (179 kilometers, 111 miles across) can be seen near lower left; Janus shares its orbit with the moon Epimetheus.
Density waves due to Janus cause some of the bright bands seen in the A ring in this image. Prometheus and Atlas also produce waves in the rings, but their wave regions are too narrow to be seen here. The interactions of the moons with each other and the rings are a major target of study for the Cassini mission.
The planet's shadow stretches all the way across the main rings in this view. The shadow has an oval shape at present, but over the next few years will become more rectangular as the planet orbits the Sun and the angle at which sunlight strikes the rings decreases. (For an example of this from the Voyager mission, see PIA00335)
The image was taken with the narrow angle camera on October 6, 2004, from a distance of 6.4 million kilometers (4 million miles) from Saturn through a filter sensitive to wavelengths of visible red light. The image scale is 38 kilometers (24 miles) per pixel.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.