| Piú viste - Saturn: the "Ringed Beauty" and His Moons |
The_Sun_behind_Saturn-EB.gifSetting Sun, in the Space of Saturn (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)58 visitenessun commentoMareKromium
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The_Sun_behind_Saturn-EB.jpgSaturnian Skyline (credits: Elisabetta Bonora - Lunexit Team)58 visitenessun commentoMareKromium
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Skoll-EB3.gifThe Sky around Sköll (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)58 visite...quando si parla delle Profondità dello Spazio, in fondo, si parla di quello che si vede in questo splendido filmato...MareKromium
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Rhea-PIA12855.jpgCratered Rhea (possible Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)58 visitenessun commentoMareKromium
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Enceladus-PIA11697.jpgThe South Pole of Enceladus58 visiteCaption NASA:"This wide-angle image shows the South Polar Region of Saturn's moon Enceladus and outlines the area covered by the High-Resolution mosaic combining data from the Imaging Science Subsystem and Composite InfraRed Spectrometer onboard the NASA's Cassini Spacecraft (see the frame PIA11696).
The outlined area focuses on Baghdad Sulcus, a fracture in the South Polar Region.
Cassini captured the data for this wide-angle image during the Spacecraft's close Fly-By of the moon that occurred on Nov. 21st, 2009. This image and others from that Fly-By are among the best Visible Light images that Cassini will capture of the Region around the so-called "Tiger Stripes" - such as those Fissures that keep spraying icy particles, water vapor and organic compounds -, before the moon's South Polar Region enters Winter darkness for the coming years.
This wide-angle view shows not only Baghdad Sulcus, but also other nearby Fractures. The Lit Terrain seen here is on the Leading hemisphere and Saturn-facing Side of Enceladus.
The South Pole lies in shadow near the bottom middle of the image.
The wide-angle view was acquired at a distance of approx. 2000 Km (such as about 1200 miles) from Enceladus and at a Sun-Enceladus-Spacecraft, or Phase, Angle of 114°.
Scale in the wide-angle view is approx. 116 meters (381 feet) per pixel".MareKromium
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Rhea-MF2.jpgRhea (Extremely Enhanced Natural Colors; credits for the additional process. and color.: Dr M. Faccin - Lunexit Team)58 visitenessun commentoMareKromium
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Japetus-EB2.gifJapetus, like a "True Star"! (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)58 visitenessun commentoMareKromium
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Dione_and_Tethys-EB-LXTT.gifCosmic Clockwork (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)58 visitenessun commentoMareKromium
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Enceladus-EB-LXTT.jpgFountains of Light (High-Def-3D; credits: Elisabetta Bonora - Lunexit Team)58 visitenessun commentoMareKromium
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Mimas-PIA12867.jpgUneven Warmth on Mimas58 visiteThe image shows NASA's Cassini Spacecraft imaging science subsystem Visible-Light mosaic of Mimas from previous flybys on the left. The right-hand image shows the new CIRS temperature data mapped on top of the Visible-Light image.
It has to be underlined the unexpected and bizarre pattern of daytime temperatures found on Saturn's small inner moon Mimas (about 396 Km, or approx. 246 miles, in diameter). The data were obtained by the composite infrared spectrometer (CIRS) on the Cassini Spacecraft during the Spacecraft's closest-ever look at Mimas on Feb. 13, 2010.
The warm part has typical temperatures near 92 Kelvin (minus 294 Fahrenheit), while typical temperatures on the cold part are about 77 Kelvin (minus 320 Fahrenheit). The cold part is probably colder because surface materials there have a greater thermal conductivity, so the Sun's energy soaks into the Sub-surface instead of warming the Surface itself. But why conductivity should vary so dramatically across the Surface of Mimas is a mystery.
The map used to create this image is a mosaic of images taken by Cassini's imaging science subsystem cameras on previous flybys of Mimas. The cold side includes the giant Herschel Crater, which is a few degrees warmer than its surroundings. It's not yet known whether Herschel is responsible in some way for the larger region of cold temperatures that surrounds it.
Cassini took 85 minutes to make the temperature map, as the Spacecraft receded from Mimas. During that time, the distance to Mimas increased from 38.000 to 67.000 Km (such as about 24.000 to 42.000 miles) and the longitude of the center of Mimas' disk increased from 128° West to 161° West, due to the moon's rotation.
Because of this changing geometry, the alignment of the temperatures relative to specific features or coordinates on Mimas is shown only approximately. The temperatures were calculated from the brightness of the moon's infrared heat radiation, measured by CIRS at a wavelength of 12 to 16 microns".MareKromium
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Mimas-PIA12571.jpgA "hint" of color for Mimas (possible Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)58 visitenessun commentoMareKromium
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Mimas-PIA12570.jpgWho are YOU looking at???58 visiteCaption NASA:"This view of Mimas is centered on Terrain located at about 11° South Latitude and 158° West Longitude. North is up.
This view was obtained at a distance of approx. 50.000 Km (approx. 31.000 miles) from Mimas and at a Sun-Mimas-Spacecraft, or Phase, Angle of 17°.
Image scale is roughly 240 meters (790 feet) per pixel".MareKromium
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