| Piú votate - Saturn: the "Ringed Beauty" and His Moons |
Japetus-N00091789.jpgApproaching Japetus (3)54 visiteCaption NASA:"N00091789.jpg was taken on September 09, 2007 and received on Earth September 09, 2007. The camera was pointing toward Japetus that, at the time, was approx. 208.568 Km away, and the image was taken using the CL1 and UV3 filters. This image has not been validated or calibrated".MareKromium
(7 voti)
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Tethys-N00090935.jpgTethys (natural colors; elab. Lunexit)54 visiteCaption NASA:"N00090935.jpg was taken on August 29, 2007 and received on Earth August 29, 2007.
The camera was pointing toward TETHYS that, at the time, was approx. 47.306 Km away, and the image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated".MareKromium
(7 voti)
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Enceladus-N00086998.jpgSpace Encounter: Enceladus and Tethys (7)60 visiteNota: invitiamo il Lettore ad osservare con attenzione il margine Sx (Dx di chi guarda) del Corpo Celeste Maggiore, circa ad ore 3. A nostro parere, anche se la definizione del frame non è certo ottima, si riesce ad intravedere il cratere Penelope.MareKromium
(7 voti)
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Tethys-N00086709.jpgThe cratered Lands of Tethys (4)54 visitenessun commentoMareKromium
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Tethys-W00030271.jpgTethys in the Saturn-shine (natural colors - elab. Lunexit)55 visitenessun commentoMareKromium
(7 voti)
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The_Rings-IMG002648-0.jpgTransient Event(s) in the "F-Ring"? (context image)55 visiteCaption NASA:"The Cassini spacecraft spies an intriguing bright clump in Saturn's "F-Ring".
Also of interest is the dark gash that appears to cut through the Ring immediately below the clump. Scientists continue to monitor this ring for small, transient clumps of material, as well as the effects of the shepherd moon Prometheus.
This view looks toward the unilluminated side of the Rings from about 28° above the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 5, 2007 at a distance of approx. 2.1 MKM (about 1,3 MMs) from Saturn. Image scale is roughly 12 Km (about 8 miles) per pixel".
Nota: dopo aver effettuato una modesta analisi di questo frame in rapporto ad altri frames CASSINI i quali pure ci appaiono rappresentativi di quei fenomeni che la NASA chiama "clumps" (---> masse/grumi di materiale), la nostra sensazione è che la particolare (o meglio: eccezionale!) luminosità del "clump" ora in oggetto (anche iuna volta messa in correlazione con la striscia scura che vedete sulla sua Dx - striscia che costituisce un chiarissimo segnale del passaggio di qualcosa attraverso i filamenti di materiale che compongono l'Anello "F") potrebbe essere dovuta al verificarsi di una collisione occorsa all'interno dell'Anello "F" stesso, la quale è stata casualmente inquadrata da una delle fotocamere della Sonda.
Non pensiamo, quindi, nè ad un image-artifact da sovrasaturazione del frame, nè al possesso di particolari qualità e/o caratteristiche chimico/fisiche da parte del "clump" in oggetto. MareKromium
(7 voti)
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Rhea-N00084610.jpgOver-exposed Rhea61 visitenessun commentoMareKromium
(7 voti)
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Dione-PIA08938.jpgThe South Polar Regions of Dione54 visiteCaption NASA:"The Cassini spacecraft takes in the crater-strewn surface near Dione's South Pole in this natural color view. Long fractures slice across the surface here, as on other parts of the moon. Previous Cassini imaging investigations have shown that the canyons seen here do not appear to have the bright, presumably youthful, walls seen in fractures nearer the Equator.
Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were taken in visible light with the Cassini spacecraft narrow-angle camera on April 8, 2007 at a distance of approx. 268.000 Km (such as about 166.000 miles) from Dione and at a Sun-Dione-spacecraft, or phase, angle of 92°.
Image scale is roughly 2 Km (5249 feet) per pixel".MareKromium
(7 voti)
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Saturn-PIA08360.jpgFrom North to South...54 visiteCaption NASA:"Dark and sharply defined ring shadows appear to constrict the flow of color from Saturn's warmly hued South to the bluish Northern Latitudes.
Scientists studying Saturn are not yet sure about the precise cause of the color change from North to South. NASA Voyager spacecraft flybys witnessed a more evenly painted Planet in the early '80s, when Saturn was closer to Equinox. However, the bluish color was readily apparent upon Cassini's approach to the Planet in late 2003, when Saturn was just coming out of its Northern Hemisphere Winter. Scientists have speculated that the color is due to seasonal effects on the atmosphere.
Aside from the color differences, the cloud morphology is quite different in the Polar Regions compared to the mid-latitudes. Bright, isolated clouds dot the high latitudes, while Saturn's middle is characterized by flowing cloud bands and the occasional bright or dark vortex.
This view looks toward the lit side of the rings from about half a degree below the Ring-Plane.
Images taken using red, green and blue spectral filters were combined to create this natural-color view. The images were obtained with the Cassini spacecraft wide-angle camera on Feb. 4, 2007, at a distance of approx. 1,2 MKM (about 700.000 miles) from Saturn. Image scale is roughly 67 Km (about 42 miles) per pixel". MareKromium
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The_Rings-N00073991.jpgSomething's in the Rings...54 visitenessun commento
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Enceladus-PIA08355.jpgCanyonland (HR)58 visiteFine topographic detail and color variations are revealed in this 11-image, false color mosaic taken during Cassini's 2nd close flyby of Saturn's moon Enceladus, on March 9, 2005.
This mosaic, a HR cropped section of the full-disk mosaic available in Fractured World, shows the center of the anti-Saturnian Hemisphere of Enceladus -- such as the side of Enceladus that always faces away from Saturn. The left portion of the mosaic is dominated by Diyar Planitia.
(7 voti)
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Enceladus-PIA08354.jpgEnceladus (in false colors)56 visiteThe mosaic shows the anti-Saturnian Hemisphere of Enceladus -- the side that always faces away from Saturn.
This Region contains a number of tectonic and impact features and shows how these two geologic forces interact on Enceladus. The center left portion of this mosaic is dominated by Diyar Planitia.
Like Sarandib Planitia observed in the previous Enceladus flyby, the Region is characterized by low ridges and troughs. Throughout this Hemisphere, fractures of all sizes disrupt the previously existing cratered terrain and even the comparatively youthful Diyar Planitia.
Many of the younger fractures have blue-green walls, revealing coarse-grained water ice in the top layers of Enceladus' lithosphere, compared to the fine-grained ice that coats much of Enceladus' surface. The blue-green color is very similar to the coatings surrounding the South Polar "tiger stripes" (these appear greener than the features in the south polar mosaic released in 2005 due to the use of clear-filter images, instead of green, in that mosaic).
(7 voti)
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