Astronomy Picture of the Day
February 2, 2015

Features of Argyre Planitia (Part II - EDM)
Features of Argyre Planitia (Part II - EDM)

Credits: NASA/JPL/University of Arizona - Credits for the additional process. and color.: Dr Paolo C. Fienga/LXTT/IPF

As the so-called "Gullies" (---> a Gully is a Ravine USUALLY formed by the Action of Running Water) form on Slopes, Sediment can become deposited to form Lobe-shaped Fans. Gullies can form with Flowing Water, but they don't have to (---> this means that the Flowing Water is NOT a so-called "condicio sine qua non" of the Gullies' formation): sometimes they can be formed by the Dry Flow of Sand and very fine Dust Grains.

This HiRISE Sub-Frame (also known as Extra Detail Magnification - "EDM" for short -, according to the Technical Language that we, as IPF, like to use here), which has been obtained by the NASA - Mars Reconnaissance Orbiter on November 16, 2014, shows us that - at least one - of these abovementioned (and seemingly still) Active Gullies, is characterized by the presence, on both sides and all along its length, of quite a few fine (---> truly small, short, thin and mostly sinuous) sub-Channels.

Mars Local Time: 15:41 (Middle Afternoon)
Coord. (centered): 43,360° South Lat. and 311,185° East Long.
Spacecraft altitude: 249,7 Km (such as about 155,063 miles)
Original image scale range: 50,0 cm/pixel (with 2 x 2 binningso objects1 mt and 85 cm across are resolved
Map projected scale: 50 cm/pixel
Emission Angle: 0,3°
Phase Angle: 51,4°
Solar Incidence Angle: 51° (meaning that the Sun was about 39° above the Local Horizon at the time the picture was taken)
Solar Longitude: 234,3° (Northern Fall - Southern Spring)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer Italia

This picture (which is a crop taken from a NASA - Original Mars Reconnaissance Orbiter Falsely Colored and NON-Map-Projected Sub-frame identified by the serial n. ESP_038931_1355-1) has been additionally processed, extra-magnified to allow the Readers a better view of the details, contrast enhanced, 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 Reconnaissance 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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