Astronomy Picture of the Day
June 15, 2014

Munch Crater
Munch Crater

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.

Today's APOD - which is a crop taken from an Original NASA - MESSENGER Spacecraft's false-colors and Map-Projected image-mosaic dated April, 26, 2014 - shows us, in great detail, the Impact Crater named Munch (after the Norwegian Impressionist painter, printmaker, and draftsman Edvard Munch (who was born on December, 12, 1863 in Adalsbruk, Norway, and died in Oslo, Norway, on January, 23, 1944). Just out of curiosity, on Wednesday, May 2nd 2012, one of the four versions of Munch's - probably MOST - famous 1895 pastel, "The Scream", was sold at an auction for $119,9 million, thus becoming one of the most expensive pieces of artwork in the World.


Munch Crater (whose diameter is almost the same one as the nearby standing Impact Crater Sander - such as about 51 Km, or approx. 31,671 miles), is located within the huge Mercurian Region known as Caloris Basin; in particular, Munch Crater is very peculiarly-looking because of its VERY DARK (Inner and Outer) Rim, which is completely covered by the so-called Low Reflectance Material (or "LRM" for short); a Material, possibly unearthed (---> excavated, taken out from the Sub-Surface) during the Impact Event, but whose true origin and chemical composition are, as of today, still unknown. A few (and, in fact, not too bright) Hollows, however, can also be spotted inside Munch Crater (particularly, on its Western Inner Slopes).


Date acquired: April, 26th, 2013
Images Mission Elapsed Time (MET): 40804465, 40804485, 40804469
Images ID: 6194731, 6194736, 6194732
InstrumentWide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 39,98° South
Center Longitude: 153,10° East
Solar Incidence Angle: 46,9° (meaning that the Sun, at the time that the picture was taken, was about 43,1° above the imaged Local Mercurian Horizon)
Emission Angle: 50,5°
Sun-Mercury-Messenger (or "Phase") Angle: 79,7°


This picture (which is a crop taken from an Original NASA - MESSENGER Spacecraft's false-colors and Map-Projected image-mosaic published on the NASA - Planetary Photojournal with the ID n. PIA 18448) has been additionally processed, contrast enhanced, Gamma corrected, magnified to aid the visibility of the details 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 outside, 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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