Astronomy Picture of the Day
September 24, 2012

Prometheus
Prometheus

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

Appearing like "eyes" on a potato, quite a few Impact Craters can be seen to cover the dimly lit Surface of the Saturnian moon Prometheus, in this High Resolution image from the NASA - Cassini Spacecraft's early 2010 Fly-by (an encounter which, in fact, allowed the Spacecraft to obtain the closest imaging sequence yet of this moon).


This view looks toward the Trailing Hemisphere of Prometheus (which is about 86 Km, or approx. 53 miles across). North on Prometheus is up and rotated to the right. The Saturnian moon is lit by Sunlight on the right and by Saturnshine on the left. The image was taken in Visible Light on the date of January, 27, 2010, with the NASA - Cassini Spacecraft Narrow-Angle Camera and the view was obtained at a distance of approx. 34.000 Km (such as about 21.000 miles) from Prometheus, at a Sun-Prometheus-Spacecraft, or Phase, Angle of 126°. The image scale is roughly 200 meters (656 feet) per pixel.


This frame (which is an Original NASA - CASSINI Spacecraft b/w frame published on the NASA - Planetary Photojournal with the n. PIA 12593) has been additionally processed and then colorized, according to an informed speculation carried out by Dr Paolo C. Fienga (LXTT-IPF), 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 Prometheus), 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 Prometheus, each having a different Albedo (---> Reflectivity) and Chemical Composition.



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