Astronomy Picture of the Day
June 30, 2014

Unnamed Channel in Arabia Terra
Unnamed Channel in Arabia Terra

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 April, 7th, 2014, and during its 54.617th orbit around the Red Planet, we can see a few Unnamed Impact Craters (all at different stages of degradation) and one of the many Unnamed Channels (whose origin is still under discussion but we, as IPF, suggest that it could be Volcanic) which are located on the Northern Margin of the Martian Region known as Arabia Terra.

Arabia Terra is a large so-called "Upland Region" located in the Northern Hemisphere of Mars and it lies, mostly, in the Arabia Quadrangle. This Region is Densely Cratered and Heavily Eroded and such a battered (---> highly irregular) Topography indicates a great age. As a matter of fact, Arabia Terra is presumed to be one of the oldest Terrains of the entire Red Planet; it covers as much as approx. 4.500 Km (such as about 2.794,5 miles) at its longest extent and it is centered roughly at 19‹47Œ North Latitude and 30‹00Œ East Longitude, with its Eastern and Southern Regions rising up to about 4 Km (roughly 13.120 feet) above the the North-Western Minimal Altitude (---> also known as "Relative Datum", such as the lowest location/point found in a specific Region, whose height, however, is different than the one of the so-called Absolute Datum, such as the Zero Altitude - which is the Sea Level on Earth, and the Northern Plains' Average Altitude on Mars).

A relatively large Unnamed Impact Crater (considering the average size of the other visible Impact Craters), whose Inner Eastern Slopes show a very High Albedo, can easily be seen, even though just partially, to the upper left (Sx) side of the frame.

Latitude (centered): 32,8763° North
Longitude (centered): 350,0480°
Instrument: VIS

This image (which is an Original Mars Odyssey Orbiter b/w and Map-Projected frame published on the NASA - Planetary Photojournal with the ID n. PIA 18485) 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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