Astronomy Picture of the Day
May 30, 2014

Siton Undae (Part II)
Siton Undae (Part II)

Credits: NASA/JPL/Arizona State University (ASU) - Credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/IPF

In this VIS image, taken by the NASA - Mars Odyssey Orbiter on March, 12th, 2014, and during its 54.307th orbit around the Red Planet, we can see another section of Siton Undae. Here, in this specific area, there is an Unnamed Impact Crater, located to the left (Sx-West) of the image and just barely visible (its Eastern Inner and Outer Rims, however, can be seen), and in its Lee, as you can see, there are no Dunes but, instead, the beginning of a brght, large and long Windstreak, as well as numerous and very well visible Dust Devil Tracks.

As a matter of fact, the Dunes surround the whole Unnamed Impact Crater, except for the Lee Area. Why? Because the Dominant Winds of this Region, moving from West to East, have been channeled into a so-called "Choatic Regime" (in other words: an area where the Winds blow chaotically) by (---> because of) the tall Crater's Rim, which has created (---> better yet: caused, in a manner of speaking) the major Surface Features that we can now admire, such as: the bright and large Windstreak, the also bright and large "Dune-free Area", and the Dust Devils (which, on their side and through their action, created the Dust Devil Tracks).

Latitude (centered): 74,3631° North
Longitude (centered): 300,6320° East
Instrument: VIS

This image (which is an Original Mars Odyssey Orbiter b/w and NON Map-Projected frame published on the NASA - Planetary Photojournal with the ID n. PIA 18261) has been additionally processed, magnified to aid the visibility of the details, contrast enhanced and sharpened, Gamma corrected and then colorized in Absolute Natural Colors (such as the colors that a human eye would actually perceive if someone were onboard the NASA - Mars Odyssey Orbiter and then looked down, towards the Surface of Mars), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team.

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