| Risultati della ricerca nelle immagini - "Fresh" |
Collapse_Features-Coprates_Catena-PIA14990-PCF-LXTT-00.jpgVery recent small-sized Impacts over Coprates Catena (Original NASA/JPL/ASU b/w Frame)137 visiteOrbit Number: 43295
Latitude: 14,89° South
Longitude: 297,35° East
Instrument: VIS
Captured: September, 18th, 2011MareKromium
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Collapse_Features-Coprates_Catena-PIA14990-PCF-LXTT-01.jpgVery recent small-sized Impacts over Coprates Catena (Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)247 visiteOrbit Number: 43295
Latitude: 14,89° South
Longitude: 297,35° East
Instrument: VIS
Captured: September, 18th, 2011MareKromium
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Craters-Unnamed_Crater-S16-01-140-03.jpgFresh Crater near Ulysses Patera (Natural Colors; credits: NASA/MGS/MSSS)59 visiteCaption NASA originale:"Ths frame has been colorized using a look-up table derived from the Colors of Mars as seen by the Mars Reconnaissance Orbiter’s High Resolution Imaging Science Experiment (HiRISE) camera".MareKromium
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Craters-Unnamed_Fresh_Crater_in_Noctis_Labyrinthus-MGS.jpgFresh Crater (Original NASA/MGS/MSSS b/w Frame)56 visiteCaption NASA originale:"This MGS-MOC image shows a relatively Fresh Crater with dark, rayed Ejecta on an upland plain above one of the many depressions in the Eastern Labyrinthus Noctis Region. The presence of the dark rays emanating from the Crater suggests that the impact was a relatively recent event compared to other Craters of similar diameter in the scene. Over time, the dark Ejecta will fade and blend in with its surroundings, owing to settling of Dust from the Atmosphere".
Location near: 9,7° South Lat. and 94,8° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern Summer
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ESP_011337_2360-PCF-LXTT.jpgUnnamed Fresh Northern Crater (CTX in Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team - Inset: credits: NASA/JPL-Caltech-Univ. of Arizona)212 visiteMars Local Time: 15:29 (Early Afternoon)
Coord. (centered): 55,6° North Lat. and 150,6° East Long.
Spacecraft altitude: 311,4 Km (such as about 194,6 miles)
Original image scale range: 31,3 cm/pixel (with 1 x 1 binning) so objects ~ 93 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 7,7°
Sun-Mars-Spacecraft (or "Phase") Angle: 77,2°
Solar Incidence Angle: 70° (meaning that the Sun is about 20° above the Local Horizon)
Solar Longitude: 180,6° (Northern Fall)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Dr Paolo C. Fienga - Lunar Explorer ItaliaMareKromium
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ESP_011610_1825-00.jpgFresh Triplet! (edm n. 1 - Natural Colors; credits: Dr M. Faccin)61 visiteCoord.: 2,4° North Lat. and 266,7° East Long.
Spacecraft altitude: about 265 Km
M.L.T.: 15:50 (middle afternoon)
S.I.A.: 58° (Sun about 32° high on the L.H.)MareKromium
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ESP_011610_1825-01.jpgFresh Triplet! (edm n. 2 - Natural Colors; credits: Dr M. Faccin)56 visitenessun commentoMareKromium
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ESP_011610_1825-02.jpgFresh Triplet! (perspective view - Natural Colors and Natural Enhanced Colors; credits: Dr M. Faccin)54 visitenessun commentoMareKromium
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ESP_011618_1885_RED_abrowse-00.jpgRecent Double-Impact (ctx frame - possible Natural Colors; credits: Lunar Explorer Italia)61 visiteMars Local Time: 15:46 (middle afternoon)
Coord. (centered): 8,6° North Lat. and 46,8° East Long.
Spacecraft altitude: 273,6 Km (such as about 171,0 miles)
Original image scale range: 27,4 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 5,9°
Phase Angle: 64,1°
Solar Incidence Angle: 58° (meaning that the Sun is about 32° above the Local Horizon)
Solar Longitude: 193,2° (Northern Autumn)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_011618_1885_RED_abrowse-01.jpgRecent Double-Impact (edm - possible Natural Colors; credits: Lunar Explorer Italia)65 visiteThe MRO Context Imager (CTX) team has been discovering many new impact events on Mars, and then they request HiRISE follow-up imaging to confirm an impact origin and to identify and measure the craters.
Crater clusters are common as these small (typically less than 1 meter diameter) objects break up in the thin Martian air and separate a little bit to make crater clusters up to a few hundred meters wide. The example shown here is the result of an impact that occurred between May 2003 and September 2007.
It was first discovered as a dark spot in a CTX image acquired in March 2008, but later found to be partly visible at the very edge of a CTX image acquired in September 2007.
A dark spot is not present in the previous image of this location with sufficient resolution to have detected it, acquired by the visible THEMIS camera on Mars Odyssey in May 2003. Thus the impact might have formed anytime between May 2003 and September 2007. The dark markings are created by removing or disturbing the surficial dust cover, and so far new impact sites have been discovered only in dust-covered regions of Mars.
Although small Martian crater clusters are common, this example is unusual because there is a dark line between the two largest craters. We hypothesize that atmospheric breakup coincidentally made two nearly equal-size objects that impacted close together in space and time so the air blasts interacted with each other to disturb the dust along this line.
Hundreds of these small objects (mostly asteroid fragments) impact Mars per year. A comparable number of small objects impact Earth each year, but explode in the upper reaches of our atmosphere and have no effect on the surface, fortunately for those of us who live here.MareKromium
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ESP_012588_1855_RED_abrowse-00.jpgFresh Impact (Natural Colors; credits: Lunexit)79 visiteIl "Dark Splat" che vedete in questa splendida immagine MRO costituisce l'evidenza oggettiva, a nostro parere, di un recentissimo impatto. Ma...che genere di impatto?
Come potrete meglio ammirare nei dettagli magnificati che seguono (tutti in formato JP-2000 ed ottenuti dal nostro eccezionale Marco Faccin), in corrispondenza del punto di (presumibile) impatto, NON C'E' CRATERE, ma solo evidenze di bruciature.
Questa circostanza la possiamo spiegare facendo 2 ipotesi:
1) il bolide si è disintegrato/è esploso quando era ormai vicinissimo al suolo (la Superficie di Marte è stata quindi "macchiata" dall'esplosione, senza restarne intaccata - se non in misura assolutamente marginale e visivamente non risolvibile - neppure dalle ottiche MRO!);
2) il bolide (una piccola cometa, riteniamo) ha EFFETTIVAMENTE impattato Marte, ma la sua massa e composizione erano talmente inconsistenti da risultare inidonee a scavare un cratere (ancorchè piccolo e poco profondo) sulla dura e rocciosa Superficie del Pianeta Rosso.
In pratica, quindi, l'evento che potrebbe essersi verificato si risolverebbe nell'impatto di una cometina (una "palla di neve sporca", come dicono alla NASA) con una superficie piatta ed oltremodo resistente. Risultato: il suolo viene appena "macchiato", ma NON intaccato!
Se avete altre ipotesi, scrivete!MareKromium
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ESP_012588_1855_RED_abrowse-01.jpgFresh Impact (EDMs - EDM 1, 2 and 3, from the bottom up, are in Natural Colors; credits: Dr M. Faccin)65 visiteOsservate attentamente: il Suolo Marziano è, effettivamente, "macchiato" - e probabilmente bruciato -, MA NON INTACCATO (una conferma in tale senso deriva dalla constatazione della circostanza per cui i Rilievi Superficiali visibili in corrispondenza della "macchia" (diremmo che si potrebbe trattare di Yardangs aventi modestissime dimensioni) non subiscono variazioni/deformazioni in rapporto ai medesimi Rilievi visibili al di fuori della zona interessata dall'impatto/esplosione (diciamo, tecnicamente, che "i Rilievi Superficiali esterni all'area di interesse proseguono senza soluzione di continuità all'interno dell'area stessa").
Che altro aggiungere? Si tratta di un fenomeno, come vedete, decisamente INTERESSANTE, ma sul quale la NASA - as usual... - non ci ha detto assolutamente nulla.
Peccato...MareKromium
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