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Natural Nubium and Cognitum, Guillermo Gonzalez

Natural Nubium and Cognitum

Natural Nubium and Cognitum, Guillermo Gonzalez

Natural Nubium and Cognitum

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I am very happy with the result of this image, a mosaic of 5 captures with good seeing, keeping the best 750 images out of around 50000 of each capture at 148 fps. I wanted to do a colour version of this area, but as real as possible, and I am satisfied with the color rendition and the resolution of the image (I recommend enlarging it to see all the features in it). 

Color capturing with mosaics and changes in contrast (close to terminador) is not an easy task as dark areas closer to terminador challenge the capture of the color, and besides it shifts a bit the hue from the well illuminated areas, that is why the bottom of the image looses color variation and shifts to blue. 

As said, it is worth to peek around the different features in an expanded version of the image. I am attaching a second version with the location of some of these features:

Ghost and filled craters: Lubiniezky with the southeastern wall open to the lava surface of Mare Nubium, Gould, a crater remnant, even more eroded than  Opelt, which is the remnant of a lava-flooded  crater, 48 km in diameter. It appears  almost like a ghost crater. Kies, an interesting, almost completely lava-filled crater with a spike-like extension to the southern crater wall.  Wolf and Parry also fall in this category.  

Floor-fractured craters as Pitatus, which was flooded  by magma intrusion through cracks and openings.  The flooded crater floor contains low hills in the east and a system of rimae , rimae Pitatus. 

Funny Craters: Hesiodus A, rare  example of a crater with a concentric  double wall (a double-walled crater). 

Rimae: The Opelt plateau is crossed by Rimae Opelt,  which has a length of about 70 km. Rima Parry, a complex system of clefts and rilles, running across Parry, Bonpland  and Fra Mauro. Pitatus rimae extend in  a circular fashion, partially interrupted but almost complete around the  inner wall of the crater. Rima Hesiodus, a wide (about 3 km) linear rille, with a  length of about 250 km. The rille probably arose through through a collapse of  the surface.


Domes: Directly west of Kies crater lies the volcanic dome  Kies π, with a diameter of about 12  km. With  a summit crater about 1 km across. 

Mounts and dorsae: Mons Moro,  a low ridge, about 10 km long and 3 km wide, lying at the  northen end of a mare wrinkle ridge.

And Mare and highlands, of course: The surface rocks from the  highlands are composed of anorthosite as most of the highlands on the near side and far side. Anorthosite represents much of the ancient lunar crust and is considered to have formed from the cooling of a massive “magma ocean” that covered the Moon to a depth of more than 100 km early in its history. Anorthosite rocks  are  poor in iron oxide and titanium dioxide.  The basalt  mare lavas are rich in iron  oxide and the fraction of  titanium dioxide is variable. Colors on the Moon are dominantly controlled by variations in iron and titanium content. The mare regions have low reflectance because they contain relatively high amounts of iron oxide (FeO). Some mare basalts contain unusually high amounts of titanium oxide (TiO2) in addition to iron oxide, making for even lower reflectance. TiO2 also shifts the color of the mare from red to blue.

(Information collected from Chu, Alan; Paech, Wolfgang; Weigand, Mario. The Cambridge Photographic Moon Atlas.  and  Introduction to Planetary Geomorphology. Ronald Greely. boh from Cambridge University Press)

Clear skies to you all!

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Natural Nubium and Cognitum, Guillermo Gonzalez