The moon Pandora casts a shadow onto Saturn's A ring but not the F ring.
Pandora (81 kilometers, or 50 miles across) can be seen at the bottom of
the image. Because Pandora is on an inclined orbit, its shadow can fall on
the main rings, but entirely miss the F ring.
The novel illumination geometry created as Saturn approaches its August
2009 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. To learn more about this special time
and to see movies of moons' shadows moving across the rings, see PIA11651
and PIA11660.
This view looks toward the unilluminated side of the rings from about 53
degrees above the ringplane. The image was taken in visible light with the
Cassini spacecraft narrow-angle camera on June 1, 2009. The view was
obtained at a distance of approximately 1.7 million kilometers (1.1
million miles) from Pandora and at a Sun-Pandora-spacecraft, or phase,
angle of 98 degrees. Image scale is 10 kilometers (6 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 mission for NASA's Science Mission Directorate, Washington, D.C. The
Cassini orbiter and its two onboard cameras were designed, developed and
assembled at JPL. The imaging operations center is based at the Space
Science Institute in Boulder, Colo.
For more information about the Cassini-Huygens mission visit
http://saturn.jpl.nasa.gov/. The Cassini imaging team
homepage is at http://ciclops.org.