Astronomy Picture of the Day
December 21, 2013

On the Walls of Damer
On the Walls of Damer

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.

The (relatively) steep Walls of the Impact Crater named Damer are well highlighted in today's APOD. Named after the English sculptor, Anne Seymour Damer (née Conway, she was born in Sevenoaks - UK - on November, 8, 1749 and died in London on May, 28, 1828) earlier this year by the International Astronomical Union (or "IAU", for short), this approx. 60-Km diameter (such as about 37,26 miles) Impact Crater is distinguished by a massive and complex Central Peak that is almost completely covered with Hollows.

Date acquired: November, 13th, 2013
Images Mission Elapsed Time (MET): 26687033
Images ID: 5191249
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 36,25° North
Center Longitude: 243,40° East
Solar Incidence Angle: 68,3° (meaning that the Sun, at the time that the picture was taken, was about 21,7° above the imaged Local Mercurian Horizon)
Emission Angle: 3,0°
Sun-Mercury-Messenger (or "Phase") Angle: 65,3°

This frame (which is an Original NASA - MESSENGER Spacecraft's b/w and NON Map-Projected image-mosaic published on the NASA - Planetary Photojournal with the ID n. PIA 17812) has been additionally processed, contrast enhanced, magnified to aid the visibility of the details, 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 - MESSENGER Spacecraft and then looked down, towards the Western Edge of the Mercurian Impact Crater "Damer"), 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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