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OPP-SOL340-1N158367309EFF40CUP1911R0M1.jpgPanorama on Sol 340: around the man-made impact crater54 visitenessun commento
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OPP-SOL340-1N158367588EFF40CUP1911R0M1.jpgPanorama on Sol 340: around the man-made impact crater54 visiteDa notare, in questo frame molto bello e ad elevata definizione, un rottame a forma tubolare - di colore argenteo e visibile quasi al centro dell'immagine - il quale ci ricorda un'Anomalia di superficie che avevamo incontrato nell'area Gusaev Crater, durante il viaggio di Spirit verso il Bonneville Crater. Si tratta in entrambi i casi di un "rottame"? In questo frangente - ossìa per Opportunity - diremmo di si: le circostanze (in particolare quelle relazionate al luogo di riptrovamento), sono quasi univocamente a favore del "rottame"; ma nel caso di Spirit...I due oggetti argentei si assomigliano - e questo è un fatto - ma Spirit, quando si è imbattuto nell'Anomalia di superficie, era - a quanto ci è dato vedere e valutare (mappe NASA alla mano) - ancora piuttosto lontano (anzi: molto lontano) dal luogo di impatto dell'Heat-Shield.
Dunque? Dunque si tratta di un altro piccolo mistero per il quale le informazioni NASA non ci forniscono alcun aiuto (anzi...).
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OPP-SOL340-1N158368088EFF40CUP1911R0M1.jpgPanorama on Sol 340: around the man-made impact crater54 visitenessun commento
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OPP-SOL340-1P158369122EFF40CUP2583L7M1.jpgClose view of the Heat-Shield (2)54 visitevedi commento al frame precedente
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Japetus-temp.2-PIA07005_modest.jpgJapetus Temperature Map54 visiteCaption NASA originale:"Temperatures reach nearly 130 Kelvin (-226 F) at noon on the equator on the dark material that covers most of this side of Japetus, making high noon on Japetus's dark side probably the warmest place in the Saturn System. This is much warmer than temperatures on the moon Phoebe - as measured by the composite infrared spectrometer in June 2004 - which peaked near 112 Kelvin (-258 F). That's because, although Phoebe is almost as dark as Japetus's dark material and absorbs nearly as much sunlight, Phoebe rotates much more quickly (once every 9 hours, compared to 79 days for Japetus). That means the surface has less time to heat up during the day. Temperatures on Japetus' bright material are much colder, peaking near 100 Kelvin (-280 F), both because the bright material absorbs less sunlight and because it is further from the equator on this side of Japetus".
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Japetus-temp.3-PIA07004_modest.jpgJapetus Thermal Radiation Image54 visiteCaption NASA originale:"This image of the infrared heat radiation from Saturn's moon Japetus was obtained by the Cassini composite infrared spectrometer instrument 16 hours before Cassini's closest approach to this mysterious moon, on December 31, 2004. The thermal radiation is shown as both a grayscale image, equivalent to what we would see if our eyes were sensitive to infrared wavelengths near 15 microns and as a color-coded temperature map. A previously-released mosaic obtained by Cassini's imaging camera shortly before the composite infrared spectrometer observation, with similar scale and orientation, is also shown for comparison. Temperatures in the large crater near the center of the disc are slightly different from those in surrounding areas, because sloping surfaces within the crater are warmer where they are tilted towards the Sun and cooler when tilted away from the Sun".
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Japetus-PIA07000_modest.jpgJapetus' surface composition (organic material?!?)54 visiteCaption NASA originale:"These two color composite images of Saturn's moon Japetus from Cassini's visual and infrared mapping spectrometer were obtained on Dec. 31, 2004, an hour and a half before the New Year, at a distance of 121.000 Km (75.186 miles), with a spatial resolution of about 60 Km (37 miles).
The three colors used in the left mosaic correspond to 1.01, 1.51, and 2 microns, while the right mosaic is comprised of images at 3.0, 3.21, and 4.60 microns. The two images show the vast difference in the composition of the bright and dark regions of Japetus. As one moves from the near infrared 1 to 2 micron spectral region (left image) to the 3 to 5 micron spectral region (right image) the bright, ice-rich region on Japetus turns dark and the dark region rich in organics turns bright".
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SOL356-2P157969350EFFA269P2762L2M1.jpgClose-up of the Columbia Hills' stones54 visitenessun commento
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SOL358-2N158150172EFFA273P0645R0M1.jpgTracks... (1)54 visitenessun commento
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SOL359-2N158235229EFFA273P1745R0M1.jpgMars-scape on Sol 359 (1)54 visitenessun commento
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SOL359-2N158235330EFFA273P1745R0M1.jpgMars-scape on Sol 359 (2)54 visitenessun commento
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SOL359-2N158235381EFFA273P1745R0M1.jpgMars-scape on Sol 359 (3)54 visitenessun commento
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