Enceladus dalmatian terrain close-up
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.
|Enceladus dalmatian terrain close-up [Credit: NASA]|
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 image 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.
Source: NASA [January 16, 2016]