CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Tethys and Calypso

Two companion moons share the sky before Cassini. Tethys is seen here with one of its two Trojan moons. Calypso, which trails the larger moon in its orbit by 60 degrees, is a couple of pixels across near lower right. Telesto is the other Tethys co-orbital moon, leading Tethys by 60 degrees.

For higher resolution Cassini views of Calypso (21 kilometers, 12 miles across) and Tethys (1,062 kilometers, 660 miles across), see PIA07633 and PIA07738, respectively.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Aug. 25, 2007. The view was obtained at a distance of approximately 2.2 million kilometers (1.4 million miles) from Tethys. Image scale is 13 kilometers (8 miles) per pixel on Tethys.

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 Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini-Huygens mission, visit and the Cassini imaging team home page,

Credit: NASA/JPL/Space Science Institute
Released: September 25, 2007 (PIA 09735)
Image/Caption Information
  Tethys and Calypso
PIA 09735

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