| Ultimi arrivi - Saturn: the "Ringed Beauty" and His Moons |
Unusual_Event_on_The_Rings-EB-N00164273.jpgPossible Collision inside the "F"-Ring (Credits for the additional process: Elisabetta Bonora - Lunexit Team)125 visiteN00164273.jpg was taken on October 16, 2010, and received on Earth on October 17, 2010. The camera was pointing toward MIMAS which, at the time, was approximately 195.976 Km away.
The image was taken using the CL1 and CL2 filters.
Nota Lunexit: l'Evento ripreso da Cassini non siamo in grado di spiegarlo compiutamente. Ad una prima (e molto superficiale) occhiata, avevamo pensato che si trattasse di un - consueto, si fa per dire... - Disturbo Gravitazionale derivato dal transito, attraverso l'Anello "F" del Gigante Gassoso, di una Luna Pastore (e l'Evento, in tal caso, sarebbe stato un cosiddetto "Streamer-Channel", tanto per essere chiari).
Tuttavia, la sua assai particolare configurazione esteriore (sembra un "flash") ci dice che potrebbe trattarsi anche di una collisione fra detriti di una certa dimensione oppure fra alcune "Particelle Maggiori" dell'Anello "F" ed un Corpo Estraneo. Una collisione ripresa davvero al momento in cui essa si stava verificando (alla NASA direbbero "caught in the act").
Purtroppo non siamo in grado di dire di più. Complimentissimi alla nostra Elisabetta Bonora per lo splendido Lavoro svolto (ancora una volta e come sempre).MareKromiumNov 03, 2010
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Dione-W00065777-79-EB-PCF-LXTT.jpgCrescent Dione (Natural Colors; credits for the additional process. and color.: Elisabetta Bonora and Paolo C. Fienga - Lunexit Team)56 visitenessun commentoMareKromiumOtt 24, 2010
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Rhea-EB-LXTT.jpgCratered Terminator (Absolute Natural Colors; credits for the additional process. and color.: Elisabetta Bonora and Paolo C. Fienga - Lunexit Team)55 visitenessun commentoMareKromiumOtt 24, 2010
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Rhea-EB-LXTT2.jpgLarge Crater and Crater Clusters (Absolute Natural Colors; credits for the additional process. and color.: Elisabetta Bonora and Paolo C. Fienga - Lunexit Team)55 visitenessun commentoMareKromiumOtt 24, 2010
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Rhea-N00164515-EB-LXTT.jpgThe "Old Face" of Rhea (an Image-Mosaic in possible True Colors by: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromiumOtt 24, 2010
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Prometheus~0.jpgThe "Rise" of Prometheus...61 visiteCaption NASA:"What is that dark streak below Prometheus? Although it may look like a shadow or a trail blazed by sweeping up material, computer simulations indicate that the dark streak is better understood as an empty path pulled away by the gravity of Saturn's small moon. The particles don't follow Prometheus so much as glide sideways past where Prometheus used to be. One dark Streamer is created during each pass of Prometheus through the F-Ring that it shepherds.
The Streamers were unpredicted and first discovered in 2004 on HR images taken by the Cassini Spacecraft orbiting Saturn.
Close inspection of the Surface of Prometheus itself in the above image shows interesting structure and craters.
The Cassini Spacecraft arrived at Saturn in 2004 and, as it continues to function well, is now expected to continue to send back data and images from the distant ringed world until 2017".MareKromiumOtt 20, 2010
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Dione-PIA12729-PCF-LXTT.jpgDione (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)79 visitenessun commentoMareKromiumOtt 16, 2010
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Saturnian_Inner_Moons-PIA13423.jpgThe (enhanced) "True Colors" of the Saturninan Inner Moons81 visiteThis set of enhanced-color maps made from data obtained by NASA's Cassini Spacecraft show Saturn's moons Mimas, Enceladus, Tethys, Dione and Rhea. The global maps show the colorful splotches and bands on the icy moons' Surfaces that scientists believe came from bombardments large and small.
Icy material sprayed by Enceladus, which makes up the misty E-Ring around Saturn, appears to leave a brighter, blue signature.
The pattern of bluish material on Enceladus, for example, indicates that the moon is covered by the fallback of its own "breath". Enceladean spray also appears to splatter the parts of Tethys, Dione and Rhea that run into the spray head-on in their orbits around Saturn. But scientists are still puzzling over the reason why the Enceladean Frost on the Leading Hemisphere of these moons bears a coral-colored, rather than bluish, tint.
On Tethys, Dione and Rhea, darker, rust-colored reddish hues paint the entire Trailing Hemisphere, or the side that faces backward in the orbit around Saturn. The reddish hues are thought to be caused by tiny particle strikes from circulating Plasma, a gas-like state of matter so hot that atoms split into an ion and an electron, in Saturn's magnetic environment. Tiny, iron-rich "nanoparticles" may also be involved, based on earlier analyses by the Cassini Visual and InfraRed Mapping Spectrometer Team.
Mimas is touched by the tint of Enceladean spray, but it appears on the trailing side of Mimas. This probably occurs because it orbits inside the path of Enceladus, or closer to Saturn, than Tethys, Dione and Rhea.
Mimas and Tethys also sport a dark, bluish band.
The bands match patterns one might expect if their Surface were being irradiated by high-energy electrons that drift in a direction opposite to the flow of Plasma in the magnetic bubble around Saturn. Scientists are still figuring out exactly what is happening on Mimas, but the electrons appear to be zapping the Surface in a way that matches the Pac-Man pattern detected by Cassini's Composite InfraRed Spectrometer.
On Rhea, a unique chain of bluish splotches appears where fresh, bluish ice has been exposed on older crater rims. Cassini imaging scientists recently reported that they did not see evidence in Cassini images of a ring around Rhea. However, scientists analyzing these new enhanced-color maps suggest the crash of orbiting material, perhaps a ring, to the surface of Rhea in the not too distant past, could explain the bluish splotches.
These new maps were made by processing raw images obtained by Cassini's imaging cameras from 2004 to 2009. Scientists analyzed frames shot through Visible-Light, UltraViolet and InfraRed filters. The processing enhanced our views of these moons beyond what could be seen by the human eye.
The maps are in a simple cylindrical projection from 90° South Latitude (bottom) to 90° North Latitude (top). From left to right, they cover 360° to - 2° West Longitude. The Leading Hemisphere appears on the right side of each map and Trailing Hemisphere appears on the left.MareKromiumOtt 11, 2010
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Saturn-PIA12721-PCF-LXTT.jpgThe "Oily Clouds" of Saturn (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)92 visiteCaption NASA:"Clouds in Saturn's Upper Atmosphere create an intricate pattern reminiscent of whipped cream swirling in coffee. The view is centered on a region located about 15° South of the Planet's Equator. The image was taken with the Cassini Spacecraft narrow-angle camera on July 18, 2010 using a spectral filter sensitive to wavelengths of Near-InfraRed light centered at 727 nanometers.
The view was obtained at a distance of approx. 2,4 MKM (abput 1,5 MMs) from Saturn and at a Sun-Saturn-Spacecraft angle of 107°.
Image scale is roughly 14 Km (a little less than 9 miles) per pixel".MareKromiumOtt 01, 2010
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Enceladus-PIA12719-PCF-LXTT.jpgEnceladus (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)121 visiteCaption NASA:"Two sources of light reveal the dramatic Surface of Saturn's moon Enceladus in this Cassini image in which geologic features give the appearance of the leathery skin of an elephant.
Geologically young and (relatively) smooth Terrain in the Southern and Middle Latitudes gives way to older, Cratered Terrain in the Northern Latitudes of the moon.
Sunlight illuminates the right of the image, and light reflected off Saturn ("Saturnshine") dimly illuminates the left. This view looks toward the Leading Hemisphere of Enceladus.
North on Enceladus is up.
The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on April 7, 2010. The view was obtained at a distance of approx. 198.000 Km (such as about 123.000 miles) from Enceladus and at a Sun-Enceladus-Spacecraft, or Phase, Angle of 92°.
Image scale is roughly 1 Km (3300 feet) per pixel".MareKromiumSet 29, 2010
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Saturn-EB-MF-LXTT.jpgLight Shades of Color... (Natural Colors; credits for te additional process. and color.: Elisabetta Bonora - Lunexit Team)91 visitenessun commentoMareKromiumSet 19, 2010
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Dione-NVL-MF-PCF-LXTT.jpgDione (an Image-Mosaic in Absolute Natural Colors by Marco Faccin and Paolo C. Fienga - Lunexit Team)128 visitenessun commentoMareKromiumSet 10, 2010
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