PIA11455: Brotherly Moons

Brotherly Moons


Prometheus and Epimetheus, brothers in Greek mythology, share the stage in this Cassini spacecraft image of the two moons near the outer A ring and faint F ring.

Prometheus—meaning 'forethought' in Greek—comes first in this image, tracking ahead in its orbital path. Prometheus (86 kilometers, or 53 miles across) is near the right edge, inside the F ring. The moon Epimetheus—with a name meaning `hindsight'—comes later, trailing in its orbit. Epimetheus (113 kilometers, or 70 miles across) is near the center of the image, outside the F ring.

This view looks toward the sunlit side of the rings from about 64 degrees below the ringplane. The image was taken in visible light with the Cassini spacecraft wide-angle camera on Feb. 15, 2009. The view was obtained at a distance of approximately 971,000 kilometers (603,000 miles) from Epimetheus and at a Sun-Epimetheus-spacecraft, or phase, angle of 109 degrees. Image scale is 58 kilometers (36 miles) per pixel.

Background Info:

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 .

Cataloging Keywords:

Name Value Additional Values
Target Saturn Rings Sun
System Saturn
Target Type Ring Sun
Mission Cassini-Huygens
Instrument Host Cassini Orbiter
Host Type Orbiter
Instrument Imaging Science Subsystem (ISS)
Detector Wide Angle Camera
Extra Keywords Grayscale
Acquisition Date
Release Date 2009-03-24
Date in Caption 2009-02-15
Image Credit NASA/JPL/Space Science Institute
Source photojournal.jpl.nasa.gov/catalog/PIA11455
Identifier PIA11455