PIA06588: String of Moons?

String of Moons?


Three of Saturn's moons appear almost like a string of pearls in this Cassini image, but looks are deceiving.

Moons visible in this image: Mimas (398 kilometers, or 247 miles across) at right, Pandora (84 kilometers, or 52 miles across) near center and Janus (181 kilometers, or 113 miles across) in the lower left corner. Mimas' orbit inclination of 1.6 degrees relative to Saturn's equator is enough to make it appear as if it orbits just beyond the F ring when viewed from this vantage point of 5 degrees below the rings. In fact, it is 34,000 kilometers (21,000 miles) more distant than Janus.

Contrast in the image was enhanced to make visible the faces of moons lit by reflected light from Saturn (their left sides). Notable here is the irregular shape of Janus, compared with larger, spherical Mimas. The bright B ring (at upper left) appears overexposed due to the extreme contrast enhancement.

The image was taken in visible light with the Cassini spacecraft narrow angle camera on Jan. 22, 2005, at a distance of approximately 2.7 million kilometers (1.7 million miles) from Saturn. The image scale is 16 kilometers (10 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 team is based at the Space Science Institute, Boulder, Colo.

For more information about the Cassini-Huygens mission, visit http://saturn.jpl.nasa.gov and the Cassini imaging team home page, http://ciclops.org .

Cataloging Keywords:

Name Value Additional Values
Target Saturn B Ring, F Ring, Janus, Mimas, Pandora, Saturn Rings
System Saturn
Target Type Planet Ring, Satellite
Mission Cassini-Huygens
Instrument Host Cassini Orbiter
Host Type Orbiter
Instrument Imaging Science Subsystem (ISS)
Detector Narrow Angle Camera
Extra Keywords Grayscale
Acquisition Date
Release Date 2005-02-18
Date in Caption 2005-01-22
Image Credit NASA/JPL/Space Science Institute
Source photojournal.jpl.nasa.gov/catalog/PIA06588
Identifier PIA06588