| Piú votate - Saturn: the "Ringed Beauty" and His Moons |
Janus-N00114757.jpgRugged Janus and various image-artifacts (MULTISPECTRUM-2; credits: Lunexit)58 visiteCaption NASA:"N00114757.jpg was taken on June 30, 2008 and received on Earth July 01, 2008.
The camera was pointing toward JANUS which, at the time, was approx. 33.205 Km away and the image was taken using the CL1 and MT2 filters.
This image has not been validated or calibrated".MareKromium
(3 voti)
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Saturn-PIA08415.jpgSpringtime's Hues - (natural colors; credits: NASA)56 visiteCaption NASA:"New hues are creeping into Saturn's Northern Cloud Bands as Winter gives way to Spring there.
During its first four years of exploration, Cassini has made the Saturn System a familiar place to us Earthlings. The intrepid craft has returned more than 150.000 images since arriving in orbit in mid-2004. In this natural color image, the blues and grays of Saturn's Northern Hemisphere, so striking in early Cassini images, are diminishing in intensity with the slow change of seasons on Saturn, and are almost imperceptibly being replaced by pale shades of the colors commonly seen by Cassini in the Planet's Southern Hemisphere.
This view looks toward the sunlit side of the Rings from about less than 1° below the Ring-Plane. Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were acquired with the Cassini Spacecraft wide-angle camera on April 23, 2008, at a distance of approx. 1,2 MKM (such as about 740.000 miles) from Saturn.
Image scale is roughly 68 Km (about 42 miles) per pixel".MareKromium
(3 voti)
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Janus-PIA10407.jpgJanus61 visiteCaption NASA:"Craters cover the rugged surface of Saturn's moon Janus. The view is from 42° above the moon's Equator. North on Janus (179 Km, or 111 miles across) is towards the top of the image.
The image was taken with the Cassini Spacecraft narrow-angle camera on May 17, 2008 using a combination of spectral filters sensitive to wavelengths of polarized green light centered at 617 and 568 nanometers. The view was acquired at a distance of approx. 350.000 Km (such as about 217.000 miles) from Janus and at a Sun-Janus-Spacecraft, or phase, angle of 101°.
Image scale is roughly 2 Km (a little more than 1 mile) per pixel".MareKromium
(3 voti)
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Enceladus-PIA10403.jpgIcy Oasis (MULTISPECTRUM-2; credits: Lunexit)61 visiteCaption NASA:"With its excess warmth, water ice jets and huge vapor plume laced with simple organic materials, Enceladus is an important part of the quest to understand environments compatible with the chemistry of life as we know it. The Sulci, or "Tiger Stripe" fractures, in the South Polar Region are visible at bottom -- the view here is parallel to the direction of the Sulci.
The view looks toward the anti-Saturn Hemisphere on the moon's Trailing Side. North on Enceladus is towards the top of the image.
This view is a composite of individual frames obtained using filters sensitive to ultraviolet (centered at 338 nanometers), green (centered at 568 nanometers) and infrared light (centered at 1002 nanometers).
The broad range of wavelengths exaggerates subtle color variations across the moon's surface.
The images were acquired with the Cassini spacecraft narrow-angle camera on May 11, 2008.
The view was obtained at a distance of approx. 739.000 Km (such as about 459.000 miles) from Enceladus and at Phase Angle of 36°.
Image scale is roughly 4 Km (about 2,5 miles) per pixel".MareKromium
(3 voti)
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Prometheus-PIA09916.jpgSpotting Prometheus (MULTISPECTRUM; credits: Lunexit)74 visiteCaption NASA:"The flattened, potato-like form of Prometheus glides silently within the Roche Division, between Saturn's A and F-Rings.
Prometheus (86 Km, or about 53 miles across at its widest point) is on the side of the Rings closest to the Cassini Spacecraft in this view. The image looks toward the sunlit side of the Rings from about 1° below the Ring-Plane.
The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on May 2, 2008. The view was acquired at a distance of approx. 1,1 MKM (such as about 660.000 miles) from Prometheus.
Image scale is roughly 6 Km (about 4 miles) per pixel".MareKromium
(3 voti)
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Tehys-N00110912.jpgTethys in the Saturnshine!61 visitenessun commentoMareKromium
(3 voti)
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Tethys-PIA09903.jpgIcy Impact: the Odysseus Basin on Tethys56 visiteCaption NASA:"The enormous Impact Basin Odysseus sits on the Eastern Limb of icy Tethys.
This view looks toward the Anti-Saturn side of Tethys and North is toward the top of the picture.
The image was taken with the Cassini Spacecraft narrow-angle camera on April 14, 2008 using a spectral filter sensitive to wavelengths of ultraviolet light centered at 338 nanometers. The view was obtained at a distance of approx. 1,1 MKM (such as about 714.000 miles) from Tethys and at a Phase Angle of 26°.
Image scale is roughly 7 Km (about 4 miles) per pixel".MareKromium
(3 voti)
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Rhea-PIA09895.jpgThe Ancient Plains of Rhea74 visiteCaption NASA:"Densely cratered plains cover the ancient surface of Saturn's moon Rhea. Following the Voyager Spacecraft encounters with Saturn, cryovolcanism was suggested as a source for the wispy markings on both Rhea and Dione.
Cassini has shown that Rhea's bright streaks are, like those on Dione, tectonic features and planetary scientists now think it is unlikely that cryovolcanic activity has ever occurred on this moon.
This view looks toward the Trailing Hemisphere of Rhea (1528 Km, or about 949 miles across). North is up.
The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on April 4, 2008. The view was acquired at a distance of approx. 1,2 MKM (such as about 735.000 miles) from Rhea and at a Sun-Rhea-Spacecraft, or Phase, angle of 39°.
Image scale is roughly 7 Km (about 4 miles) per pixel".MareKromium
(3 voti)
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Saturn-PIA08410.jpgElectrical Storm on Saturn's Upper Troposphere (natural colors; credits: NASA)57 visiteCaption NASA:"A bright, powerful, lightning-producing storm churns and coasts along the lane of Saturn's Southern Hemisphere nicknamed "Storm Alley" by scientists.
NASA's Cassini spacecraft detected this particular tempest after nearly 2 years during which Saturn did not appear to produce any large electrical storms of this kind. The storm appears as a bright, irregular splotch on the Planet near lower right.
Lightning flashes within the persistent storm produce radio waves, called Saturn Electrostatic Discharges, which the Cassini radio and plasma wave science instrument first detected on Nov. 27, 2007. Cassini's imaging cameras then spotted the storm, taking the images used to create this color view about a week later on Dec. 6, 2007.
This electrical storm is similar in appearance and intensity to those previously monitored by Cassini. All of these powerful electrostatic producing storms appeared at about 35° South Latitude on Saturn.
This storm has now been continuously tracked by Cassini for several months, whereas previous storms observed by the Spacecraft lasted for less than 30 days.
The view looks toward the un-illuminated side of the Rings from about 5° above the Ring-Plane. Tethys (about 1071 Km, or approx. 665 miles across) is seen here in the foreground, and casts its shadow onto the high Northern Latitudes.
Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were acquired with the Cassini spacecraft wide-angle camera at a distance of approx. 1,7 MKM (1 MMs) from Saturn.
Image scale is roughly 97 Km (about 60 miles) per pixel".MareKromium
(3 voti)
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Saturn-PIA08411.jpgElectrical Storm on Saturn's Upper Troposphere (approx. true colors; credits: NASA)58 visiteCaption NASA:"It is no Great Red Spot, but these two side-by-side views show the longest-lived electrical storm yet observed on Saturn by NASA's Cassini Spacecraft.
The views were acquired more than 3 months after the storm was first detected from its lightning-produced radio discharges on Nov. 27, 2007.
Cassini imaging scientists believe the storm to be a vertically extended disturbance that penetrates from Saturn's Lower to Upper Troposphere.
The view at left was created by combining images taken using red, green and blue spectral filters, and shows Saturn in colors that approximate what the human eye would see. The storm stands out with greater clarity in the sharpened, enhanced color view at right. This view combines images taken in infrared, green and violet light at 939, 567 and 420 nanometers respectively and represents an expansion of the wavelength region of the electromagnetic spectrum visible to human eyes. This view looks toward the un-illuminated side of the Rings from about 3° above the Ring-Plane.
Janus (about 181 Km, or approx. 113 miles across) appears as a dark speck just beneath the Rings in both images.
These images were obtained with the Cassini spacecraft wide-angle camera on March 4, 2008, at a distance of approx. 1,3 MKM (about 800.000 miles) from Saturn.
Image scale is roughly 74 Km (about 46 miles) per pixel".MareKromium
(3 voti)
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Sun-N00107151.jpgSunshine through the Rings... (natural colors; credits: Lunexit)56 visiteCaption NASA:"Caption NASA:"N00107151.jpg was taken on April 10, 2008 and received on Earth on April 11, 2008. The camera was pointing toward SATURN, F-RING that, at the time, was approx. 613.189 Km away, and the image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated".MareKromium
(3 voti)
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Saturn-PIA09876~0.jpgNorthern Latitudes (Natural Colors; credits: NASA)56 visiteCaption NASA:"Saturn dominates this colorful view, taken from a vantage point high above the Rings. From here the Cassini Spacecraft can see the Rings' far side, where the dark shadow of Saturn abruptly terminates their visibility.
Mimas (about 397 Km, or approx. 247 miles across) casts its shadow onto the Planet's Northern Latitudes (just below center).
This view looks toward the unilluminated side of the Rings from about 27° above the Ring-Plane.
Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were acquired with the Cassini spacecraft wide-angle camera on Feb. 26, 2008 at a distance of approx. 1,6 MKM (such as about 1 MMs) from Saturn.
Image scale is roughly 93 Km (about 58 miles) per pixel".MareKromium
(3 voti)
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