Astronomy Picture of the Day
January 11, 2013

Far Forever...
Far Forever...

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

These two large (and extremely ancient) Impact Craters, named after the most important characters in Homer's Odyssey, take the stage in this scene, located on the Icy Saturnian moon, Tethys. The Impact Crater on the right (Dx) of the frame is the Odysseus Crater (approx. 450 Km, such as a little less than 280 miles across). The one on the left (Sx) side of the picture, instead, is Penelope, named after the wife of Odysseus, approx. 208 Km wide (such as about 129 miles), and located near the Equator of Tethys, in the center of its Trailing Hemisphere, at 10,8° South Latitude and 249,2° West Longitude.


This view looks toward the Anti-Saturn Side of Tethys (which is approx. 1060 Km, or 658 miles across). North on Tethys is up and rotated 44° to the right. The image was taken in Visible Light with the NASA - Cassini Spacecraft Narrow-Angle Camera on April 12, 2009. The view was acquired at a distance of approximately 931.000 Km (such as a little more than 578.000 miles) from Tethys and at a Sun-Tethys-Cassini Spacecraft, or Phase, Angle of 33°. Image scale is roughly 6 Km (approx. 3,7 miles) per pixel


This frame (which is an Original NASA - Cassini Spacecraft image published on the NASA - Planetary Photojournal with the ID n. PIA 11495) 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 Tethys), 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 Tethys, each having a different Albedo (---> Reflectivity) and Chemical Composition.



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