Follow this link to skip to the main content

Switcharoo Moons



Category: Moons > Epimetheus

Epimetheus and Janus at the edge of the F ring

Switcharoo Moons
October 25, 2005
Full-Res: PIA07615

Outside the soft edge of Cassini's F ring, Epimetheus and Janus negotiate their nearly-shared orbit. The two moons' orbits are typically about 50 kilometers (30 miles) apart, and the moons actually change orbits every few years: one moon becoming the innermost of the pair, the other becoming the outermost.

Epimetheus' diameter is 116 kilometers (72 miles). Janus' diameter is 181 kilometers (113 miles) across.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 8, 2005, at a distance of approximately 1.5 million kilometers (1 million miles) from Saturn. The image scale is about 11 kilometers (7 miles) per pixel on the two moons.

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 .

Credit: NASA/JPL/Space Science Institute




  • Blend space exploration with reading and writing -- Reading, Writing & Rings!
  • Cassini Scientist for a Day -- Students get involved
  • Cassini Raw Images