Astronomy Picture of the Day
September 15, 2012

Belet Region
Belet Region

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

In the big frame: the NASA - Cassini Spacecraft looks toward the Dark Region of Belet, on Saturn's largest moon, Titan. This large Region (like, in general, almost the entire Surface of Titan) possesses a very low Albedo, meaning that it (diffusely) reflects little light. This view looks toward the area between the Trailing Hemisphere and the Anti-Saturn Side of Titan; North is up and rotated to the left. The image was taken with the NASA - Cassini Spacecraft wide-angle camera on Dec. 28, 2009 using a spectral filter sensitive to wavelengths of Near-InfraRed Light centered at 939 nanometers. The view was obtained at a distance of approx. 282.000 Km (such as about 175.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 45°. Image scale is roughly 17 Km (about 10 miles) per pixel.


In the inset: close-up of Belet. Here, the distance of the NASA - Cassini Spacecraft from Titan, at the time the picture was taken, was of about 33.000 Km (such as about 24.000 miles) and the image scale is (roughly) of only 2 Km (such as a little more than 1 mile) per pixel.


The two frames forming this image-composite have 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 Titan), 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 Titan, each having a different Albedo (---> Reflectivity) and Chemical Composition.



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