Astronomy Picture of the Day
May 28, 2014

Evander Crater
Evander Crater

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

Evander Crater, such as one of largest Impact Crater found on the Saturnian moon Dione, appears here half in shadow, thus throwing its Topography into sharp relief. Evander Crater is centered at about 57° South Latitude and 145° West Longitude. The illuminated Terrain seen here is located on the Anti-Saturn Hemisphere of Dione; North is up and rotated approx. 25° to the left (Sx). The image was taken in Visible Light with the NASA - Cassini Spacecraft Narrow-Angle Camera on August, 22, 2013.


The view was acquired at a distance of approximately 870.000 miles (such as a little more than 1,4 Million KiloMeters) from Dione; the image scale is roughly 5 miles (such as about 8,04 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 17165) 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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