| Ultimi arrivi - Saturn: the "Ringed Beauty" and His Moons |
The_Rings-PIA08825.jpgBright "things" in the Sky of Saturn56 visiteCaption NASA:"Saturn's shadow cloaks the faint D-Ring at the bottom of this image. Observations of the shadow boundary, like this one, enable scientists to clearly detect and measure the brightness of diffuse and faint Ring features like the inner part of the D-Ring. Such brightness measurements are often difficult to make, but the shadow region provides a very dark standard against which to compare the D-Ring, as the only brightness in the shadow is provided by the background of space.
The bright specks across the scene, both in the bright Rings and in the shadow, are either stars or cosmic ray hits on the camera's detector. This view looks toward the unlit side of the rings from about 42° above the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft wide-angle camera on Nov. 12, 2006. Cassini was then at a distance of approx. 1,4 MKM (about 900.000 miles) from Saturn and at a phase angle of 152°.
Image scale is roughly 8 Km (5 miles) per pixel".MareKromiumDic 22, 2006
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The_Rings-PIA08837.jpgThe Rings (in natural colors)57 visiteCaption NASA:"Saturn's sunlit Rings gleam in the blackness as two icy moons cruise past in the foreground.
Enceladus is a small crescent near upper left; Janus is a speck above the F-Ring, near center. Janus was brightened slightly for visibility.
This view looks toward the lit side of the Rings from about 5° below the Ring-Plane.
This image was taken in visible red light with the Cassini spacecraft wide-angle camera on Nov. 7, 2006, at a distance of approx. 1,1 MKM (about 700.000 miles) from Saturn and at a Sun-Saturn-Spacecraft, or phase, angle of 139°.
Image scale on the sky at the distance of Saturn is roughly 63 Km (about 39 miles) per pixel".Dic 16, 2006
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The_Rings-PIA08834.jpgThe Rings58 visiteCaption NASA:"The contrast is sharp between the outer portion of the A-Ring edge and the Ring's main body. One explanation for this is that the outer A-Ring region contains smaller particles (around 1 cm or 0,4" in radius) than the main rings, allowing more opportunities for light scattering before it scatters toward the camera.
Ringlets in the Encke Gap and flanking the bright F-Ring core are clearly visible here.
This view looks toward the lit side of the Rings from about 4° below the Ring-Plane.
The image was taken with the Cassini spacecraft narrow-angle camera using a spectral filter sensitive to wavelengths of infrared light centered at 752 nanometers on Nov. 7, 2006. Cassini was then at a distance of approx. 1,1 MKM (about 700.000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 140°.
Image scale on the sky at the distance of Saturn is about 6 Km (a little less than 4 miles) per pixel".Dic 15, 2006
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The_Rings-PIA08836.jpgThe Rings' texture57 visiteCaption NASA:"This close-up of the inner edge of the Cassini Division shows an enormous amount of structure, including a grainy texture in the bright outer B-Ring material near the gap edge.
An extreme enhancement of the original image, presented at right, reveals the grainy region with greater clarity.
This view looks toward the lit side of the rings from about 54° below the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Nov. 8, 2006 at a distance of approx. 378.000 Km (about 235.000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 68°.
Image scale is roughly 2 Km (a little more than 1 mile) per pixel".Dic 15, 2006
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Saturn-PIA08833.jpgNorthern Latitudes of Saturn and the B-Ring's shadow56 visiteCaption NASA:"Streaks of cloud are overlain with graceful ring shadows in this view of Saturn's Northern Latitudes.
Structure is visible in the shadow of the A-Ring and Cassini Division, which widen at the highest latitudes, near lower right. The lower left half of the image does not show the blackness of space, but rather the shadow of the B-Ring, which is perfectly dark here.
The image was acquired from a high inclination above the Planet's Ring-Plane and looks obliquely toward the limb. (...)
The image was taken with the Cassini spacecraft narrow-angle camera using a spectral filter sensitive to wavelengths of infrared light centered at 938 nanometers on Oct. 30, 2006. Cassini was then at a distance of approx. 1,2 MKM (about 700.000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 142°.
Image scale is roughly 7 Km (a little more than 4 miles) per pixel".Dic 11, 2006
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Saturn-PIA08822.jpgSaturn's limb (NASA - natural colors)60 visiteCaption NASA originale:"From its unique perspective high above the Planet, the Cassini spacecraft looks down upon Saturn's murky Northern Hemisphere. The bluish hues seen in some Cassini views of Saturn's North are notably absent in this viewing geometry.
The dark side of Saturn's extensive Rings is just visible in the top half of the image.
The view looks toward the unlit side of the Rings, from about 44° above the Ring-Plane.
Images taken using red, green and blue spectral filters were combined to create this natural color view.
The images was taken with the Cassini spacecraft wide-angle camera on Oct. 30, 2006, at a distance of approx. 1,4 MKM (about 900.000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 150°. Image scale is roughly 78 Km (about 49 miles) per pixel".Dic 02, 2006
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Enceladus-PIA06581_modest.jpgEnceladus (natural colors)57 visitePrimo esperimento di elaborazione/colorizzazione Lunar Explorer Italia su Enceladus (la "Luna di Neve").
A diversa colorazione corrisponde diversa albedo; la dominante scelta è celeste, con sub-toni grigi, azzurri e bianchi.MareKromiumDic 01, 2006
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Japetus-N00071141.jpgJapetus in natural colors57 visiteCaption NASA:"N00071141.jpg was taken on November 27, 2006 and received on Earth November 28, 2006. The camera was pointing toward Japetus that, at the time, was approximately 1.998.833 Km away.
The image was taken using the CL1 and IR3 filters. This image has not been validated or calibrated". Nov 30, 2006
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Pan-PIA08317.jpgA "Bright Pearl" in the Darkness: Pan in the Gap58 visiteCaption NASA originale:"This Cassini spacecraft view of Pan in the Encke Gap shows hints of detail on the moon's dark side, which is lit by Saturnshine -- sunlight reflected off Saturn.
Pan (26 Km, or 16 miles across) cruises the Encke Gap (325 Km, or 200 miles wide) with several faint ringlets.
This view looks toward the lit side of the Rings from about 52° below the Ring-Plane. The sunlit portion of Pan is partly overexposed.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Oct. 27, 2006 at a distance of approx. 385.000 Km (about 239.000 miles) from Pan and at a Sun-Pan-spacecraft, or phase, angle of 86°. Image scale is roughly 2 Km (1,4 miles) per pixel".Nov 25, 2006
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Mimas-N00070733.jpgMimas (1)57 visiteCaption NASA:"N00070733.jpg was taken on November 20, 2006 and received on Earth November 23, 2006. The camera was pointing toward Mimas that, at the time, was approximately 156.199 KM away.
The image was taken using the CL1 and CL2 filters and has not been validated or calibrated".Nov 24, 2006
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Mimas-N00070754.jpgMimas (2)57 visiteCaption NASA:"N00070754.jpg was taken on November 20, 2006 and received on Earth November 23, 2006. The camera was pointing toward Mimas that, at the time, was approximately 152.344 Km away.
The image was taken using the P120 and MT2 filters and has not been validated or calibrated".Nov 24, 2006
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Spokes-PIA08316.jpgSpokes!59 visiteCaption NASA originale:"A broad and ghostly spoke drifts past under the Cassini spacecraft's gaze. The spoke-forming region of the B-Ring displays faint longitudinal variations in brightness, from left to right, a feature seen also in other images.
This view looks toward the unlit side of the Rings from about 35° above the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Oct. 17, 2006 at a distance of approx. 2 MKM (such as about 1,3 MMs) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 158°. Image scale is roughly 12 Km (about 7 miles) per pixel".Nov 24, 2006
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