| Piú viste - Saturn: the "Ringed Beauty" and His Moons |
The_Rings-MF-N00150070_to_N00150100.jpgGlowing in the Darkness... (Image Mosaic - Possible True Colors; credits: Dr M. Faccin - Lunexit Team)54 visitenessun commentoMareKromium
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SaturnianSpace-RB1.gifViews and Features of the Space of Saturn (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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SaturnianSpace-MF.gifStars, Streaks and (overexposed) Moons in the Space of Saturn (GIF-Movie; credits: Dr M. Faccin - Lunexit Team)54 visitenessun commentoMareKromium
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SaturnianSpace-EB2.gifViews and Features of the Space of Saturn (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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SaturnianSpace-EB3.gifViews and Features of the Space of Saturn (Edited GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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Enceladus-EB-LXTT2.jpgCosmic "Snowball"... (Natural Colors; credits: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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Enceladus-EB-LXTT1.jpgCosmic "Snowball"... (Natural Colors; credits: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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Epimetheus_and_Janus-EB-LXTT.gifBrothers & Runners: Epimetheus and Janus (a GIF-Movie by Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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Enceladus-EB-LXTT6.jpgBeyond the Visible Light: Enceladus in IR and UV (an Image-Mosaic by Elisabetta Bonora - Lunexit Team)54 visiteUn altro spettacolare "Educational" della nostra Amica e Partner Elisabetta Bonora, in attesa che anche la NASA o l'ESA - se non altro "ufficialmente" ed attraverso i loro "Canali Pubblici" - facciano qualcosa di ugualmente valido ed istruttivo.
Un'attesa che, molto probabilmente, sarà vana...MareKromium
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Saturn_and_Companions-EB-LXTT.jpgDeep Space... (Natural Colors; credits: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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Saturn-Triplet-EB-LXTT.jpgSaturnian Views: RGB, IR and Methane (an Image-Mosaic by Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
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Propeller-PIA12790-1.jpgSaturnian "Propeller": Earhart54 visiteA propeller-shaped structure created by an unseen moon is brightly illuminated on the Sunlit Side of Saturn's Rings in this image obtained by NASA's Cassini Spacecraft.
The moon, which is too small to be seen, is at the center of the Propeller Structure visible in the upper left of the image, near the Encke Gap of the A-Ring. The A-Ring is the outermost of Saturn's Main Rings.
The moon is likely about 1 Km (a little moere than half a mile) across. Disturbed ring material to the upper left and lower right of the moon reflects Sunlight brightly and appears like a white airplane propeller.
Several density waves are also visible in the Ring. A spiral density wave is a spiral-shaped accumulation of particles that tightly winds many times around the Planet. It is the result of gravitational tugs by individual moons whose orbits are in resonance with the particles' orbits at a specific distance from Saturn.
A Propeller's appearance changes with viewing geometry, and this image shows the way a Propeller looks when viewed from the sunlit side of the Rings. Contrasts can reverse when the structure is observed on the dark side of the Rings: for example, the bright structure of this Propeller corresponds to the dark portion at the center of the propeller seen in PIA12791 which was imaged from the unilluminated side of the Rings.
This image is part of a growing catalogue of "Propeller Moons" that, despite being too small to be seen, enhance their visibility by creating larger disturbances in the surrounding fabric of Saturn's Rings. Cassini scientists now have tracked several of these individual Propeller Moons embedded in Saturn's disk over several years.
These images are important because they represent the first time scientists have been able to track the orbits of objects in space that are embedded in a disk of material. Continued monitoring of these objects may lead to direct observations of the interaction between a disk of material and embedded moons. Such interactions help scientists understand fundamental principles of how Solar Systems formed from disks of matter. Indeed, Cassini scientists have seen changes in the orbits of these moons, although they don't yet know exactly what causes these changes.
Imaging scientists nicknamed the Propeller shown here "Earhart" after the early American aviatrix Amelia Earhart. The Propeller Structure is about 5 Km (a little more than 3 miles) in the radial dimension (the dimension moving outward from Saturn which is far out of frame to the lower right of this image). It is about 60 Km (approx. 35 miles) in the azimuthal (longitudinal) dimension.
This same Propeller can be seen casting a shadow around the time of the Planet's Equinox in PIA11672. See PIA07791 and PIA07792 to learn more about Propeller shapes and to see smaller Propellers.
Scale in the original image was about 2 Km (about 1,3 miles) per pixel. The image has been rotated and contrast-enhanced to aid visibility.
This view looks toward the Southern, sunlit side of the Rings from about 81° below the Ring-Plane. The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on April 11, 2008. The view was obtained at a distance of approx. 364.000 Km (such as about 226.000 miles) from Saturn and at a Sun-Saturn-Spacecraft, or Phase, Angle of 82°.MareKromium
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