Astronomy Picture of the Day
February 15, 2013

Welcome to Asgard!
Welcome to Asgard!

Credits: NASA/JPL/Univ. of Arizona - Galileo Project; Credits fo the additional process. and color.: Dr Paolo C. Fienga/LXTT/IPF

The Region photographed by the NASA - Galileo Spacecraft and visible in great detail in this Absolute Natural Colors image-mosaic, is located on the Leading Hemisphere of Callisto, near 26° North Latitude, 142° West Longitude, and it is almost 1400 Km (such as a little less than 870 miles) across. North is toward the top of the mosaic and the Sun illuminates the Callistoan Surface from the East (Dx). Dominating the scene, is the Multi Ring Impact Structure known as Asgard, which is centered on the smooth, bright Region near the middle of the picture and surrounded by Concentric Rings that reach up to approx. 1700 Km (such as about 1056 miles) in diameter.


A second (and slightly smaller) Ringed Structure with a diameter of about 500 Km (such as a little more than 310 miles) can also be seen to the North of Asgard, but is partially obscured by the more recent, Bright-Rayed Impact Crater named "Burr". Notice how the white and very bright Icy Materials that were excavated (---> brought to the Surface of Callisto) by the younger Impact Craters, contrast sharply with the darker and brown/red coatings that, on the other hand, are found on the older Surfaces of Callisto.


This frame (which is an Original NASA - Galileo Spacecraft color image mosaic published on the NASA - Planetary Photojournal with the ID n. PIA 00562) has been additionally processed and then re-colorized, according to an educated guess, 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 - Galileo Spacecraft and then looked outside, towards the Jovian moon Callisto), 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 Callisto, each having a different Albedo (---> Reflectivity) and Chemical Composition.



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