Astronomy Picture of the Day
October 4, 2012

Large Rayed Crater on Dione
Large Rayed Crater on Dione

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

The NASA - Cassini Spacecraft looks at an example of a Rayed Crater located on the Leading Hemisphere of the Saturnian moon Dione. The Rayed Crater is in the upper-left of the image and its Rays (made by Ejecta ---> such as by Rocky Material, belonging to Dione, that was lifted up and thrown away in every direction at the time of the Impact) show up as brighter material ("brighter" if compared to the Albedo of the Surface that surrounds it) which emanates from the Crater itself.

This view, as we said hereabove, looks toward the Leading Hemisphere of Dione (which is approx. 700 miles, such as about 1125 kilometers across). North on Dione is up and rotated 12 degrees to the left. The image was taken in Visible Light with the NASA - Cassini Spacecraft Narrow-Angle Camera on July 23, 2012. The view was acquired at a distance of approximately 260.000 miles (such as about 418.000 kilometers) from Dione and at a Sun-Dione-Spacecraft (or Phase) Angle of . Image scale is about 2 miles (such as a little more than 3 kilometers) per pixel.

This frame (which is an Original NASA - Cassini Spacecraft image published on the NASA - Planetary Photojournal with the ID n. PIA 14628) 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.

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