Astronomy Picture of the Day
June 29, 2013

Unnamed (and relatively fresh) Impact Crater (EDM)
Unnamed (and relatively fresh) Impact Crater (EDM)

Credits: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington and Dr Paolo C. Fienga/LXTT/IPF for the additional process. and color.

This Absolute Natural Color Image-Mosaic shows us a bright (and, of course, relatively speaking, "fresh") Complex Mercurian Impact Crater - approx. 33 Km (such as about 20,49 miles) in diameter -  that exhibits Terraced and Multi-Layered Inner Walls and Slopes - with some Collapse Feature (Mass-Wasting?) here and there -, an also quite Complex Central Peaks' System and, last but not least, the (more than just) possible evidence of a large Pyroclastic Deposit located on it's Eastern Side (---> Dx of the Crater for the Observer), and mostly concentrated in the Region going from about 1 to 4 o'clock of its Outer Surroundings.

Date acquired: November, 6th, 2011
Images Mission Elapsed Time (MET): 229105596, 229105592, 229105588
Images ID: 980566, 980565, 980564
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 25,42° North
Center Longitude: 266,80° East
Solar Incidence Angle: 52,3° (meaning that the Sun, at the time that the picture was taken, was about 37,7° above the imaged Local Mercurian Horizon)
Emission Angle: 16,8°
Sun-Mercury-Messenger (or "Phase") Angle: 69,1°

This picture (which is a crop from an Original NASA - MESSENGER Spacecraft's false colors Map-Projected image-mosaic published on the NASA - Planetary Photojournal with the ID n. PIA 17290) has been additionally processed, contrast enhanced, magnified and then re-colorized in Absolute Natural Colors (such as the colors that a human eye would actually perceive if someone were onboard the NASA - MESSENGER Spacecraft and then looked down, towards the Surface of Mercury), 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 other things, the existence of different Elements (Minerals) present on the Surface of Mercury, each having a different Albedo (---> Reflectivity) and Chemical Composition.

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