NASA Releases Close Up Of Saturn’s Moon Enceladus
During its final close flyby of Saturn’s moon Enceladus, NASA’s Cassini spacecraft revisited a landscape, and a mystery, that it had originally glimpsed more than 10 years earlier.
In views of this terrain captured during a 2005 flyby, imaging scientists noticed small dark spots of an uncertain nature. Observing the same features in this false-color view, at higher resolution than before, provides some new insights. The spots are evidently large, relatively
dark protrusions of solid “bedrock” ice and ice blocks scattered on and around the prominent ridge that runs across the scene from north to south (from top center toward lower left). The ice blocks range in size from dozens to hundreds of feet (tens to hundreds of meters).
The false-color view uses an ultraviolet filter centered at 338 nanometers for blue, a green filter centered at 568 nanometers for green and a near-infrared filter centered at 930 nanometers for red — thus covering a wider spectrum region than the human eye.
As in earlier Cassini views of Enceladus using the same combination of color filters, green-hued features represent coarse-grained or solid ice. Exposures of these kinds of ices are also found on the walls of cracks and troughs in this scene and elsewhere on Enceladus.
To an observer on the surface, the prominent north-south trending ridge might look superficially like icy flatirons (tilted, triangular outcroppings of rock), but probably more shallowly dipping than terrestrial examples. The exposed line of ice blocks along its ridge crest might make it look a bit like a hogback (a narrow ridge with steep sides, often with vertical rocky outcrops along the top).
On Enceladus, with no wind to scour loose particulate ice or “snow” off of them, the solid blocks are probably cleared by some combination of downslope movement of particulates, and perhaps sublimation.
This new image (at the top) has a spatial scale of about 220 feet (67 meters) per pixel at its center, which is nearly twice the resolution of the earlier view.
This terrain is on the moon’s Saturn-facing side, a few degrees south of the equator. The view has been rotated so that north on Enceladus is up. The view was obtained by the Cassini spacecraft narrow-angle camera on Dec. 19, 2015.
It is easy to forget just how large Saturn is, at around 10 times the diameter of Earth. And with a diameter of about 72,400 miles (116,500 kilometers), the planet simply dwarfs its retinue of moons. One of those satellites, Tethys (660 miles or 1,062 kilometers across), is seen here at lower right.
This view looks toward the sunlit side of the rings from about 8 degrees above the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on March 7, 2015 using a spectral filter that preferentially admits wavelengths of near-infrared light centered at 752 nanometers.
Tethys has been brightened by a factor of 2 to increase its visibility.
The view was acquired at a distance of approximately 1.6 million miles (2.6 million kilometers) from Saturn. Image scale is 10 miles (16 kilometers) per pixel. Tethys is slightly closer at 1.5 million miles (2.4 million kilometers) away, for an image scale of 9 miles (14 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.