Cassini Views Saturn’s Moon Janus

Cassini Views Saturn's Moon Janus

Saturn’s moon Janus. Credit: NASA/JPL-Caltech/Space Science Institute

This image from the Cassini spacecraft shows Saturn’s moon Janus at a distance of approximately 2.5 million kilometers.

Although Janus should be the least lonely of all moons – sharing its orbit with Epimetheus – it still spends most of its orbit far from other moons, alone in the vastness of space.

Janus (111 miles or 179 kilometers across) and Epimetheus have the same average distance from Saturn, but they take turns being a little closer or a little farther from Saturn, swapping positions approximately every 4 years. See PIA08348 for more.

This view looks toward the sunlit side of the rings from about 19 degrees above the ringplane. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on February 4, 2015.

The view was acquired at a distance of approximately 1.6 million miles (2.5 million kilometers) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 91 degrees. The image scale is 9 miles (15 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (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. 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, Colorado.

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