The novel illumination geometry created as the Saturnian system approaches equinox allows moons orbiting in or near the plane of Saturn's equatorial rings to cast shadows onto the rings. These scenes are possible only during the few months before and after Saturn's equinox, which occurs only once in about 15 Earth years. Mimas, 396 kilometers (246 miles) across, does not appear in this image, but the moon has a flattened, or oblate, shape. This view looks toward the sunlit side of the rings from about 52 degrees below the ringplane. Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were obtained with the Cassini spacecraft wide-angle camera on April 8, 2009 at a distance of approximately 1.1 million kilometers (684,000 miles) from Saturn. Image scale is 64 kilometers (40 miles) per pixel. (Image credit: NASA/JPL/Space Science Institute)
Satnews Daily
June 21st, 2009
Cassini Captures: Mimas Makes Moonshadow On Saturn
The novel illumination geometry created as the Saturnian system approaches equinox allows moons orbiting in or near the plane of Saturn's equatorial rings to cast shadows onto the rings. These scenes are possible only during the few months before and after Saturn's equinox, which occurs only once in about 15 Earth years. Mimas, 396 kilometers (246 miles) across, does not appear in this image, but the moon has a flattened, or oblate, shape. This view looks toward the sunlit side of the rings from about 52 degrees below the ringplane. Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were obtained with the Cassini spacecraft wide-angle camera on April 8, 2009 at a distance of approximately 1.1 million kilometers (684,000 miles) from Saturn. Image scale is 64 kilometers (40 miles) per pixel. (Image credit: NASA/JPL/Space Science Institute)