Mars Reconnaissance Orbiter (MRO)
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Psp_001488_2665_red.jpgNorth Polar Layers and WInd-caused Striations (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)58 visitenessun commentoMareKromium
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Psp_001490_2505_red.jpgThe Northern Plains (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)54 visiteM.L.T.: 15:06 (early afternoon)
Latitude (centered): 70,5° North
Longitude: 70,6° East
Range to target site: 314 Km (about 194,8 miles)
Original image scale range: 31,4 cm/pixel (with 1 x 1 binning) so objects ~94 cm across are resolved
Map Projected Scale: 25 cm/pixel
Map Projection: POLAR STEREOGRAPHIC
Emission Angle: 5,1°
Phase Angle (Sun-Mars-MRO): 56,5 °
Solar Incidence Angle: 61° (meaning that the Sun is about 29° above the Local Horizon)
Solar Longitude: 138,3° (Northern Summer)MareKromium
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Psp_001497_2480_red-00.jpgThe Northern Lakes: Lake "Ginny" (CTX Frame - False Colors)55 visiteQuando si sa dove guardare e che cosa cercare...Si finisce SEMPRE (o quasi...) con il trovare.
L'albedo del dettaglio che vedete in basso alla Vostra Dx è inconfondibile. Il detail-mgnf che abbiamo operato (e che vedrete nel prossimo quadro) è chiarissimo: c'è un nuovo Lago nelle Grandi Pianure Nordiche di Marte!
"Lake Ginny", questa volta (sempre con buona pace di IAU, NASA, ESA e di tutti gli altri Fenomeni che guardano, guardano, guardano...etc.).MareKromium
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Psp_001497_2480_red-00~0.jpgThe Northern Lakes: Lake "Ginny" (CTX Frame - Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team) 123 visitenessun commentoMareKromium
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Psp_001497_2480_red-01.jpgThe Northern Lakes: Lake "Ginny" (EDM - False Colors)53 visiteEd una volta operato un extra-detail mgnf a noi pare che non ci possano essere più dubbi di sorta: sul fondo di questo Cratere c'è un deposito di ghiaccio (l'albedo del ghiaccio d'acqua non tradisce!) e quindi, come già fatto in passato, possiamo parlare tranquillamente di Frozen Lake.
E poi, dato che NASA ed ESA non vedono (e se hanno visto, non hanno detto nulla), noi, in qualità di "scopritori" di questo Terzo Lago Marziano, abbiamo deciso di battezzarlo con il nome di "Lake Ginny".
Attenzione: noi lo sappiamo che la IAU non approverà mai queste nostre decisioni nè avallerà mai queste nostre scoperte (almeno non finchè saremo vivi...).
Tuttavia, se in un futuro (lontano) ci verrà resa un pò di giustizia, forse qualcuno dei nomi che abbiamo dato ad alcuni rilievi Lunari e Marziani che, tutto sommato ed a ragion veduta, riteniamo legittimamente di aver individuato per primi, potrebbe anche essere confermato. E nel dubbio, operando con entusiasmo e con il cuore pieno di speranza...Noi "battezziamo"!MareKromium
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Psp_001497_2480_red-01~0.jpgThe Northern Lakes: Lake "Ginny" (EDM - Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team) 129 visiteProbabilmente (a differenza di quanto da noi supposto e speculato in passato) questa surface feature non è altro che un deposito di ghiaccio persistente - o di neve - il quale è sopravvissuto al disgelo sia grazie alla sua particolare posizione (in effetti giace leggermente infossato), sia in conseguenza di un benevolo regime dei Venti Dominanti (i quali non sono riusciti a spazzarlo via).
Certo, potrebbe anche trattarsi di un mini-laghetto, però...MareKromium
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Psp_001503_2180_red-00.jpgTricks of the Light, Tricks of the Surface... (context image - 1)53 visitenessun commento
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Psp_001503_2180_red-01.jpgTricks of the Light, Tricks of the Surface... (extra-detail mgnf - 2)57 visitenessun commento
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Psp_001503_2180_red-02.jpgTricks of the Light, Tricks of the Surface... (extra-detail mgnf - 3)53 visitenessun commento
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Psp_001691_1320_red.jpgGullied Trough in Noachis Terra(False Colors)53 visitePSP_001691_1320 shows gullies in a semi-circular trough in Noachis Terra. The gullies are observed to face all directions.
It is interesting to note that the gully morphology seen here depends on the orientation of the gullies. The morphology differences are most pronounced on the sunlit slope, with the gullies facing South (Dx) being more deeply incised than those facing the West. It is unknown what caused the different gully morphologies, but there are several possibilities.
Gullies are proposed to form at locations determined by the availability of a forming liquid (thought to be water) and/or the amount of insolation the slope receives, among other factors. It is possible that the deeper gullies experienced more erosional events or that their erosional events were more effective for undetermined reasons. It is also possible that the gullies formed at different times such that they did not have the same amount of water — either for an individual flow or total — available to them.
Also, the underlying topography could make the gullies appear relatively more incised without this actually being the case.
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Psp_001691_1320_red~0.jpgGullied Trough in Noachis Terra (extra-detail mgnf - false colors)53 visiteThe majority of the gullies on both sides of the trough appear to originate at a boulder-rich layer seen in this subimage.
The layer appears dark on the sunlit slope because the boulders sticking out from the slopes cast shadows. If these gullies formed by water from the subsurface, then it is possible that this layer is a permeable layer that conducted water to the surface.
The layer is deteriorating and traveling down slope in the form of boulders.
These boulders can clearly be seen in the alcoves of the gullies on both sides of the trough.
Note that the alternating stripes on the lower right (Dx) side of the image are an artifact from camera noise. They are not real features.
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Psp_001697_1390_red.jpgUnnamed (and yet beautiful) Crater with Gullies in Terra Sirenum54 visiteThis image shows part of an unnamed crater, itself located inside the much larger Newton Crater, in Terra Sirenum. This unnamed crater is approx. 7 Km in diameter (over 4 miles) and some 700 mt (about 760 yards) deep.
Numerous gully systems are visible on the East- and South-facing walls of the crater; their characteristics are astonishingly diverse, though.
These troughs are extremely rectilinear, lack tributaries and do not seem to have terminal fan deposits: they terminate rather abruptly, some of them in a spatula-like shape. Their characteristics contrast sharply with those of gully systems elsewhere in this same crater, which are sinuous, have numerous tributaries and show distinct fan deposits.
HiRISE is unveiling the large diversity exhibited by Martian Gully Systems, thanks to its HR, stereo and color capabilities. These diverse types of gullies observed may have been produced by different mechanisms. Current leading hypotheses explaining the origin of gullies include erosion from seepage or eruption of water from a subsurface aquifer, melting of ground ice, or surface snow; and dry landslides. MareKromium
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