Annotated Version
Shown here are the highest resolution images of the moons Pan and Atlas,
showing their distinctive "flying saucer" shapes, owing to equatorial
ridges not seen on the other moons of Saturn.
From left to right: a view of Atlas' trailing hemisphere, with north up,
at a spatial scale of about 1 kilometer (0.6 mile) per pixel; Atlas seen
at about 250 meters (820 feet) per pixel from mid-southern latitudes, with
the sub-Saturn hemisphere at the top and leading hemisphere to the left;
Pan's trailing hemisphere seen at about 3 kilometers (2 miles) per pixel
from low southern latitudes; an equatorial view, with Saturn in the
background, of Pan's anti-Saturn hemisphere at about 1 kilometer (0.6
mile) per pixel.
On Atlas, the ridge extends 20 to 30 degrees in latitude on either side of
the equator; on Pan, its latitudinal extent is 15 to 20 degrees. Atlas
shows more asymmetry than Pan in having a more rounded ridge in the
leading and sub-Saturn quadrants.
The heights of the ridges can be crudely estimated by assuming
(ellipsoidal) shapes that lack ridges and vary smoothly cross the equator.
Heights of Atlas' ridge range from about 3 kilometers (2 miles) at 270
degrees west longitude to 5 kilometers (3 miles) at 180 and 0 degrees.
Pan's ridge reaches about 4 kilometers (2.5 miles) at 0 degrees west
longitude, and is about 1.5 kilometers (0.9 mile) high over most of the
rest of the equator.
The ridges represent about 27 percent of Atlas' volume and 10 percent of
Pan's volume.
The images were acquired with the Cassini spacecraft narrow-angle camera
between 2005 and 2007. Pan is 33 kilometers (20.5 miles) across at its
equator and 21 kilometers (13 miles) across at its poles; Atlas is 39
kilometers (24 miles) across at its equator and 18 kilometers (11 miles)
across at its poles.
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/home/index.cfm.
The Cassini imaging team homepage is at http://ciclops.org.
