| Ultimi arrivi - Titan: The "Foggy" Moon |
Titan-W00002390.jpgFrom the Dark Side... (Natural - but enhanced - Colors; credits: Lunar Explorer Italia)57 visitenessun commentoMareKromiumApr 12, 2009
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Titan-W00003515.jpgFrom the Dark Side... (Natural Colors; credits: Lunar Explorer Italia)55 visitenessun commentoMareKromiumApr 12, 2009
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Titan-Surface-34-PIA06440.jpgOn the Surface... (Natural Colors; credits: Lunar Explorer Italia)56 visitenessun commentoMareKromiumApr 12, 2009
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Titan-PIA11468.jpgFrom the Dark Side... (Natural - but enhanced - Colors; credits: NASA/JPL/Space Science Institute)55 visiteCaption NASA:"From the Dark Side of Titan, the Cassini Spacecraft profiles the moon's Atmosphere as sunlight filters through its upper Hazes.
An airless satellite would appear in this viewing geometry only as a lit crescent. But Titan's thick Atmosphere scatters light around all edges of the Planet to create a ring of light.
Images taken using red, green and blue spectral filters were combined to create this full color view of Titan at high phase. The color in the image on the right has been computer enhanced to bring out the outer haze layer, and the contrast in both images has been enhanced.
This view looks toward the Saturn-facing Side of Titan. North on Titan is up and rotated 45° to the left. The images were acquired at a distance of approx. 1,8 MKM (1,1 MMs) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 157°.
Image scale is roughly 11 Km (about 7 miles) per pixel".MareKromiumApr 12, 2009
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Titan-Regions-Hotei_Arcus_Region-PIA11839-3.jpgHotei Arcus in InfraRed (possible Natural Colors; credits: Lunar Explorer Italia)60 visitenessun commentoMareKromiumApr 04, 2009
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Titan-Regions-Hotei_Arcus_Region-PIA11839-2.jpgHotei Arcus in InfraRed (False Colors; credits: NASA/JPL/Space Science Institute)61 visitenessun commentoMareKromiumApr 04, 2009
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Titan-Regions-Hotei_Arcus_Region-PIA11839-1.jpgHotei Arcus in InfraRed (RAW-b&w frame)57 visiteCaption NASA:"This InfraRed image taken by the Visual and InfraRed Mapping Spectrometer (VIMS) on NASA's Cassini Spacecraft shows Hotei Arcus, a Region on Saturn's moon Titan where changes in brightness have been measured several times during the last four years.
The brightness variations, combined with flow-like morphology seen in higher resolution Cassini radar images, suggest that Hotei Arcus may be the site of current activity, possibly an Ice Volcano. If so, it would be the first active Cryovolcano to be observed on Titan.
The red markings in the false color image (next frame) indicate a Region that is chemically distinct from its surroundings, which may correspond to the most recent location of activity.
Visual and InfraRed Mapping Spectrometer Scientists also report the brightness changes are consistent with transient deposits of Ammonia frost on Titan's Surface, although other materials cannot be ruled out.
Ammonia is generally believed to be an important component in the interior of Titan. The association of Ammonia with brightening in this Region would further suggest that Hotei Arcus is presently a center of activity.
This image was taken at a distance of about 29.000 Km (approx. 18.000 miles) on Nov. 19, 2008".
MareKromiumApr 04, 2009
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Titan-N00051529-1.jpgThrough the Titanian Clouds... (credits: Dr M. Faccin)57 visitenessun commentoMareKromiumMar 15, 2009
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Titan-N00051529-2.jpgThrough the Titanian Clouds... (credits: Dr M. Faccin)57 visitenessun commentoMareKromiumMar 15, 2009
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Titan-N00081033.jpgFrom "RAW" to Natural Colors: Titan (credits: Dr M. Faccin)56 visitenessun commentoMareKromiumMar 14, 2009
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Titan-N00051470.gifApproaching the Clouds of Titan (GIF-Movie - credits: Dr M. Faccin)56 visitenessun commentoMareKromiumMar 12, 2009
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Titan-Map-PIA11149.jpgTitan's Global Digital Map (credits: NASA/JPL/Space Science Institute)55 visiteThis Global Digital Map of Saturn's moon Titan was created using images taken by the Cassini Spacecraft's Imaging Science Subsystem.
The images were taken using a filter centered at 938 nanometers, allowing researchers to examine variations in albedo (or inherent brightness) across the Surface of Titan. Because of the scattering of light by Titan's dense Atmosphere, no topographic shading is visible in these images.
The map is an equidistant projection and has a scale of 4 Km (about 2,5 miles) per pixel. Actual resolution varies greatly across the map, with the best coverage (close to the map scale) near the center and edges of the map and the worst coverage on the Leading Hemisphere (centered around 120° West Long.).
Imaging coverage in the Northern Polar Region continues to improve as Titan approaches northern vernal equinox in August 2009 and the North Pole comes out of shadow. Large dark areas, strongly suspected to be liquid-hydrocarbon-filled lakes, have been documented at high at high latitudes (see PIA11146).
The mean radius of Titan used for projection of this map is 2,575 kilometers (1,600 miles). Until a control network is created for Titan, the satellite is assumed to be spherical.
MareKromiumFeb 27, 2009
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