Astronomy Picture of the Day
January 5, 2014

Lennon Crater
Lennon 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.

In this frame, taken by the NASA - MESSENGER Spacecraft on January, 13, 2012, we can see the Complex Impact Crater Lennon - so recently named, by the International Astronomical Union (or "IAU", for short), after John Winston Ono Lennon (1940 - 1980), an English songwriter, musician, and singer who rose to worldwide fame as a founding member of the Beatles, one of the most commercially successful and critically acclaimed band in the history of popular music.

As you may want to notice, it seems (but at this resolution we cannot be one-hundred-per-cent sure of such a circumstance) that no Hollows - we would say "strangely", being the Hollows a very common Surface Feature of the Innermost Planet of the Solar System - are visible on the (relatively) flat Floor, nor on the Inner and Outer Rim of this, however, extremely ancient Mercurian Crater.

Date acquired: January, 13th, 2012
Image Mission Elapsed Time (MET): 234915233
Image ID: 1259055
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 35,82° South
Center Longitude: 40,72° East
Solar Incidence Angle: 71,1° (meaning that the Sun, at the time that the picture was taken, was about 18,9° above the imaged Local Mercurian Horizon)
Emission Angle: 20,2°
Sun-Mercury-Messenger (or "Phase") Angle: 70,9°

This frame (which is an Original NASA - MESSENGER Spacecraft's b/w and Map-Projected image published on the NASA - Planetary Photojournal with the ID n. PIA 17813) 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 "Mena"), 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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