Astronomy Picture of the Day
March 12, 2013

Crescent Dione
Crescent Dione

Credits: NASA/JPL/Space Science Institute - Credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/IPF

The famed "Wispy Terrain" located on the Saturnian moon Dione (whose diameter is approx. 700 miles - such as a little more than 1126 Km - across), is well visible just in the front and center of this recent NASA - Cassini Spacecraft image. The so-called "Wisps" are (always relatively speaking) fresh and bright sinuous Fractures that are found on the Trailing Hemisphere of the moon's Icy Surface.


This view is centered on 55° North Latitude and 85° West LongitudeNorth is up and rotated 39° to the left. The image was taken in Visible Light with the NASA - Cassini Spacecraft Narrow-Angle Camera on December 23, 2012. The view was obtained at a distance of approximately 153.000 miles (such as about 246.229 Km) from Dione. The image scale is roughly 0,9 miles (such as a 1,448 Km) per pixel.


This frame (which is an Original NASA - Cassini Spacecraft image published on the NASA - Planetary Photojournal with the ID n. PIA 14650) has been additionally processed 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: if you want to see this very same image in Superdefinition and Natural Colors, please refer to the APOD of January 23, 2013.



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