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 satellites of Saturn were not named until 1847, when William Herschel's son John Herschel published Results of Astronomical Observations made at the Cape of Good Hope, suggesting that the names of the Titans (sisters and brothers of Cronus) be u… New composite images made from NASAs Cassini spacecraft data are the most detailed global infrared views ever produced of Saturns moon Enceladus.

The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL.

Explanation: Saturn and two of its larger moons - Tethys and Dione - were photographed by the Voyager 1 spacecraft which flew by the planet in November of 1980. Enceladus Global View with Plume (Artist's Rendering), Site Editors: Tony Greicius, Randal Jackson, Naomi Hartono. This higher albedo is due to Tethys being closer to the moon Enceladus and the E ring. Dione is an icy body that is similar to Tethys. The view was obtained at a distance of approximately 1.2 million kilometers (746,000 miles) from Dione and at a Sun-Dione-spacecraft, or phase, angle of 88 degrees. This darkening is responsible for the hemispheric albedo asymmetry mentioned above. This natural color, time-lapse movie comprised of images from the Cassini spacecraft taken in December 2010 shows Dione moving from left to right, passing behind its sister moon Tethys, which remains in the center of the frame. See PIA08921 and PIA11688 to see images of Enceladus's plume and the E ring. The shadows of Saturn's three bright rings and Tethys are cast onto the cloud tops. Cassini found Dione in 1684 using a large aerial telescope he set up on the grounds of the Paris Observatory. Tethys and Darker Dione Saturn's moon Dione, in the foreground of this Cassini spacecraft image, appears darker than the moon Tethys. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. Giovanni Domenico Cassini named the four moons he discovered (Tethys, Dione, Rhea and Iapetus) Sidera Lodoicea ("the stars of Louis") to honor king Louis XIV. Such a bifurcated color pattern results in the existence of a bluish band between … The limb of the planet can be seen easily through the 3,500-kilometer-wide (2,170 mile) Cassini Division, which separates ring A from ring B. Image scale is 7 kilometers (4 miles) per pixel on Dione and 11 kilometers (7 miles) per pixel on Tethys.

The leading hemisphere also reddens slightly as the apexof the motion is approached, although without any noticeable darkening. The surface of Tethys has a number of large-scale features distinguished by their color and sometimes brightness.

This debris then coats Enceladus and Tethys with bright material.

Tethys appears brighter because it has a higher albedo than Dione, meaning Tethys reflects more sunlight.

The Cassini imaging team homepage is at http://ciclops.org. Instrument: Imaging Science Subsystem - Narrow Angle, Image credit: NASA/JPL/Space Science Institute. Tethys appears brighter because it has a higher albedo than Dione, meaning Tethys reflects more sunlight. Bright debris spews from Enceladus, feeding the E ring. Saturn's moon Dione, in the foreground of this Cassini spacecraft image, appears darker than the moon Tethys. The shadows of Saturn's three bright rings and Tethys are cast onto the cloud tops. The trailing hemisphere gets increasingly red and dark as the anti-apex of motion is approached.

Saturn and two of its moons, Tethys (above) and Dione, were photographed by Voyager 1 on November 3, 1980, from 13 million kilometers (8 million miles). This infrared global map of Saturns icy moon Enceladus was created using images acquired by NASAs Cassini spacecraft. Tethys and Dione Please accept marketing-cookies to watch this video. The view was obtained at a distance of approximately 1.8 million kilometers (1.1 million miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 88 degrees. The Italian astronomer spotted both Tethys and Dione on March 21, making them the last two of the four moons first found by the astronomer (the other two were Iapetus and Rhea).

Saturn and two of its moons, Tethys (above) and Dione, were photographed by Voyager 1 on November 3, 1980, from 13 million kilometers (8 million miles). Because of the viewing geometry, lit terrain seen here is on the anti- Saturn side of Dione (1,123 kilometers, or 698 miles across) and the leading hemisphere of Tethys (1,062 kilometers, or 660 miles across). Dione is probably composed of a rocky core making up one-third of the moon's mass, and the rest is composed of water-ice. 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/. This higher albedo is due to Tethys being closer to the moon Enceladus and the E ring.

The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on March 23, 2010. Dione [dy-OH-nee] is the second densest moon of Saturn, after Titan. Tethys and Dione This natural color, time-lapse movie comprised of images from the Cassini spacecraft taken in December 2010 shows Dione moving from left to right, passing behind its sister moon Tethys, which remains in the center of the frame. This illustration shows Saturns icy moon Enceladus with the plume of ice particles, water vapor and organic molecules that sprays from fractures in the moons south polar region. This picture gives an indication of Saturn's extensive ring system , which can be seen casting a shadow on the planet, as does Tethys.