| Piú viste - SOLAR SYSTEM |
Saturn-PIA07652.jpgCassini, Encke and Keeler: bright arcs in the shadow of the Rings60 visiteSaturn's Rings throw imposing shadows and relegate parts of the Planet's Northern Regions to darkness. Three thin and bright arcs in this scene represent three well-known gaps in the immense Ring System. From bottom to top here (and widest to thinnest) they are the Cassini Division, the Encke Gap and the Keeler Gap.
The image was taken in infrared light (752 nnmts) using the Cassini spacecraft wide-angle camera on Oct. 29, 2005, at a distance of approximately 446.000 Km (about 277.000 miles) from Saturn.
The image scale is 23 Km (roughly 14 miles) per pixel.
The image was contrast enhanced to improve visibility of features in the atmosphere.
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Tethys-PIA07667.jpgTethys and Saturn, in "natural colors"60 visiteOriginal caption:"Tethys floats before the massive, golden-hued globe of Saturn in this natural color view. The thin, dark line of the Rings curves around the horizon at top.
Visible on Tethys are the huge craters Odysseus (top) and Melanthius (bottom). The view looks toward the anti-Saturn side of Tethys.
Images taken using red, green and blue spectral filters were combined to create this color view. Tethys is apparently darker than Saturn at these wavelengths. The edge of the Planet appears fuzzy, which may indicate that we are seeing haze layers that are separated from the main cloud deck.
The images were acquired by the Cassini spacecraft narrow-angle camera on Dec. 3, 2005, at a distance of approx. 2,5 MKM (about 1,6 MMs) from Saturn. The image scale is about 15 Km (app.x 9 miles) per pixel on Saturn and about 13 Km (app.x 8 miles) per pixel on Tethys".
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Enygma-W00012854.jpgEnygma (2)60 visiteOriginal caption:"W00012854.jpg was taken on January 05, 2006 and received on Earth January 06, 2006. The camera was pointing toward SKY, and the image was taken using the CL1 and RED filters. This image has not been validated or calibrated".
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Rhea-N00048464.jpgCrescent Rhea60 visiteCaption originale:"N00048464.jpg was taken on January 18, 2006 and received on Earth January 18, 2006. The camera was pointing toward Rhea that, at the time, was approximately 267.591 Km away, and the image was taken using the CL1 and CL2 filters.
This image has not been validated or calibrated".
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Epimetheus-PIA07680.jpgSinking in a Sea of Darkness...60 visiteThe Cassini spacecraft captured this glimpse of icy Epimetheus just before the small moon disappeared behind the bulk of Saturn's atmosphere.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Dec. 20, 2005, at a distance of approx. 2,3 MKM (about 1,4 MMs) from Epimetheus and 2,2 MKM (about 1,3 MMs) from Saturn. The image scale is roughly 14 Km (about 9 miles) per pixel on Epimetheus and approx. 13 Km (about 8 miles) per pixel on Saturn.
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Dione-PIA07691.jpgDione's faulted surface (HR - enhanced colors)60 visiteCaption originale:"(...) To create this enhanced-color view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences. This "color map" was then superposed over a clear-filter image.
The origin of the color differences is not yet understood, but may be caused by subtle differences in the surface composition or the sizes of grains making up the icy soil.
Even this view looks toward the Leading Hemisphere on Dione. North is up and rotated 20° to the right.
All the images were acquired with the Cassini spacecraft narrow-angle camera on Dec. 24, 2005 at a distance of approximately 151.000 Km(about 94.000 miles) from Dione and at a phase angle of 99°.
Image scale is approx. 896 mt (about 2.940 feet) per pixel".
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Rhea-N00049540.jpgRhea and Companions (2)60 visiteOriginal caption:"N00049540.jpg was taken on January 27, 2006 and received on Earth January 29, 2006. The camera was pointing toward Rhea that, at the time, was approximately 3.012.654 Km away, and the image was taken using the CL1 and CL2 filters".
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Enceladus-PIA07694.jpgThe "Young Face" of Enceladus60 visiteOriginal caption:"For Enceladus, wrinkles mean the opposite of old age. This view of a crescent Enceladus shows a transition zone between a wrinkled and presumably younger Region of terrain and an older, more heavily cratered Region. The moon's geologically active Southern Polar Region is seen on the left.
The lit terrain shown here is on the side of Enceladus that faces away from Saturn.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Dec. 24, 2005 at a distance of approx. 108.000 Km (such as about 67.000 miles) from Enceladus, at a Sun-Enceladus-spacecraft angle of 102°.
Image scale is roughly 646 mt (about 2.118 feet) per pixel".
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Tethys-PIA07698.jpgSmiling Tethys...60 visiteCaption originale:"The profile of Ithaca Chasma forms a great scar in the icy crescent of Tethys. The chasm stretches more than a 1.000 Km (about 620 miles) over Tethys' surface, from North to South.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Dec. 25, 2005 at a distance of approximately 313.000 Km (about 195.000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 151°. Image scale is about 2 Km (approx. 1 mile) per pixel".
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Rhea-PIA08121.jpgThe incoherent surface of Rhea60 visiteThis intense false-color view highlights and enhances color variations across the cratered and cracked surface of Saturn's moon Rhea.
To create the false-color view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences. This "color map" was then superposed over a clear-filter image. The origin of the color differences is not yet understood, but it may be caused by subtle differences in the surface composition or grain sizes making up the icy soil.
This view shows terrain on the trailing hemisphere of Rhea. North is up.
The images were taken using the Cassini spacecraft narrow-angle camera on Jan. 18, 2006, at a distance of approx. 268.000 Km (about 166.000 miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 115°. Image scale is about 2 Km (roughly 1,2 miles) per pixel.
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Tethys-N00051464.jpgTethys60 visitecaption originale:"N00051464.jpg was taken on February 25, 2006 and received on Earth February 26, 2006. The camera was pointing toward Tethys that, at the time, was approximately 152.812 Km away.
The image was taken using the UV1 and CL2 filters.
This image has not been validated or calibrated".
Nota: un frame davvero splendido, che ci mostra non solo la "tessitura" della superficie di Tethys (curiosamente lineare, almeno in apparenza), ma anche i dettagli di alcuni rilievi le cui immagini chiare e ravvicinate (ma davvero "chiare"!) farebbero sicuramente la felicità di tanti Studiosi di Scienze Planetarie. Ed ora guardate bene: siete certi che l'origine dei crateri che vediamo sia proprio - senza alcun dubbio - "da impatto"?...
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Mimas&Saturn-PIA08122.jpgThe King and I...60 visiteA small and battered reminder of the Solar System's violent youth, the ice moon Mimas hurtles around its gas giant parent, Saturn.
With its "poor dimensions" (Mimas is only about 397 Km across), this little moon is dwarfed by the immensity of Saturn (the Ringed Gas Planet is more than 150 times as wide as Mimas).
Mimas is seen here against the night side of Saturn and Saturn itself is faintly lit by sunlight reflecting off its Rings.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Jan. 20, 2006, at a distance of approx. 1,4 MKM (such as about 900,000 miles) from Mimas and at a Sun-Mimas-spacecraft, or phase, angle of 145°. Image scale is about 9 Km (approx. 5 miles) per pixel.
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