Astronomy Picture of the Day
February 19, 2014

Features of Dione
Features of Dione

Credits: NASA/JPL-Caltech/Space Science Institute and Dr Paolo C. Fienga/LXTT/IPF, for the additional process. and color.

Although the Crack-like Features seen here, on Dione's Surface, appear wispy (---> thin) and faded, they are, in reality, a series of Geologically fresh Fractures. The Lit Terrain visible in this picture is located on the Trailing Hemisphere of Dione; North is up and rotated 29° to the left (Sx). The image was taken in Visible Light, with the NASA - Cassini Spacecraft Narrow-Angle Camera on September 10, 2013.

The view was acquired at a distance of approximately 554.000 miles (such  as about 891.574 Km) from Dione. Image scale is roughly 3 miles (about 4,82 Km) per pixel.

This frame (which is an Original NASA - Cassini Spacecraft b/w frame published on the NASA - Planetary Photojournal with the ID n. PIA 17149) has been additionally processed, contrast enhanced, magnified to aid visibility of the Surface details and then colorized in Absolute Natural Colors (such as the colors that a human eye would actually perceive if someone were onboard the NASA - Cassini Spacecraft and then looked outside, towards the Saturnian moon Dione), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team. Different colors, as well as different shades of the same color, mean, among others, the existence of different Elements present on the Surface of Dione, each having a different Albedo (---> Reflectivity) and Chemical Composition.

Note: it is possible (but we, as IPF, have no way to be one-hundred-percent sure of such a circumstance), that the actual luminosity of Dione - as it is in this frame - would appear, to an average human eye, way lower than it has been shown (or, better yet: interpreted) here.

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