| Piú viste - Titan: The "Foggy" Moon |
Titan-Rivers-Unnamed_Rivers_and_Channels-PIA08604-1.jpgCold Titanian Rivers (Possible Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)252 visitenessun commentoMareKromium
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Titan-W00039678.jpgCrescent Titan (Enhanced Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)245 visitenessun commentoMareKromium
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Titan_and_Callistus-PIA13896.jpgTitan and Callistus (a Mosaic by NASA/JPL)231 visiteCaption NASA:"These images compare Surface Features observed by NASA's Cassini Spacecraft at the Xanadu Region on Saturn's moon Titan (left), and Features observed by NASA's Galileo Spacecraft on Jupiter's cratered moon Callistus (right).
The Cassini Radar Image, obtained during a Titan Fly-By occurred on April, 30th, 2006, is centered at about 10° South Latitude and 85° West Longitude.
The Galileo Camera Image, obtained on June 25, 1997, is centered at about 6° South Latitude and 7° West Longitude.
Titan may originally have had a cratered landscape similar to Callisto that has since been eroded by Rainfall and Runoffs. There are many large Circular Features in Titan's Xanadu Region that have some of the characteristics of impact craters - such as Central Peaks and inward-facing Circular Cliffs - which make scientists think they are, in fact, eroded Impact Craters. The Surface of Callisto also has a substantially eroded cratered landscape". MareKromium
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Titan-Regions-Tortula_Facula_Region-PIA13895.jpgTortula Facula (alias "Nondescript Obstacle")227 visiteCaption NASA:"These side-by-side images obtained by NASA's Cassini Spacecraft show the feature named Tortola Facula on Titan. The left image was obtained by the Visual and InfraRed Mapping Spectrometer data on Oct. 26, 2004, at a resolution of about 2 Km (1,242 mile) per pixel. This mosaic focuses on an area around 9° North Latitude and 145° West Longitude.
In 2005, scientists interpreted Tortola Facula as an ice volcano.
The right image shows the same feature, as seen by Cassini's Radar Instrument on May 12, 2008, at a much higher resolution of approx. 300 meters per pixel. Scientists now think that this feature is a "Nondescript Obstacle" surrounded by obvious wind-blown Sand Dunes, similar to those commonly found in this Region of Titan.
In radar images, objects appear bright when they are tilted toward the Spacecraft or have rough surfaces". MareKromium
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Titan-N00172750-N00172779-GB-LXTT.gifPassing-by... (a GIF-Movie by Dr Gianluigi Barca - Lunexit Team)207 visitenessun commentoMareKromium
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Titan-Seas-Kraken_Mare-PIA14584-PCF-LXTT.jpgKraken Mare (Enhanced Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)204 visiteCaption NASA:"The Cassini Spacecraft looks toward Saturn's largest moon, Titan, and spies the huge, Northern Kraken Mare. Kraken Mare, a large sea of liquid hydrocarbons and is visible as a dark area near the top of the image. This view looks toward the Saturn-facing Side of Titan. North on Titan is up and rotated 29° to the left.
The image was taken with the Cassini Spacecraft narrow-angle camera on Sept. 14, 2011 using a spectral filter sensitive to wavelengths of Near-InfraRed Light centered at 938 nanometers. The view was acquired at a distance of approx. 1,2 MMs (such as about 1,9 MKM) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 26°.
Image scale is roughly 7 miles (approx. 12 Km) per pixel".MareKromium
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Titan-PIA12817-PCF-LXTT.jpgTitanian "Arrow-shaped Storm" (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)194 visiteCaption NASA:"A huge arrow-shaped Storm blows across the Equatorial Regions of Titan in this image from NASA's Cassini Spacecraft, chronicling the Seasonal Weather Changes on Saturn's largest moon.
This Storm created large effects in the form of dark -- likely wet -- areas on the Surface of Titan, as better visible in later images. After this Storm dissipated, Cassini observed significant changes on Titan's Surface at the Southern Boundary of the Dunefield named Belet.
Those changes covered an area of approx. 500.000 square Km (310.500 square miles), or roughly the combined area of Arizona and Utah in the United States.
The part of the Storm that is visible here measures approx. 1200 Km (745,2 miles) in length East-to-West. The wings of the Storm that trail off to the North/West and South/West from the Easternmost point of the storm are each approx. 1500 Km (931,5 miles) long.
Titan's weather has been changing since the August 2009 Equinox, when the Sun lays directly over the Equators of Saturn and its moons, and Storms at low Latitudes are now more common.
This image is a mosaic of two Cassini images. Most of this view is from an image of the storm captured on Sept. 27, 2010. However, because that image's framing cut off the South Polar Region of the Planet, a second image of Titan, taken on July 9, 2010, was used to fill in that portion of the celestial body. This second image was re-projected to the same Viewing Geometry as the first.
Lit Terrain seen here is in the area between the Trailing Hemisphere, which is the side of Titan that faces backward in its orbit around Saturn, and the side of Titan that always faces away from Saturn. North on Titan is up.
The images were taken with the Cassini Spacecraft narrow-angle camera using a spectral filter of Near-InfraRed Light centered at 938 nanometers. The view was acquired at a distance of approx. 1,3 MKM (807.300 miles) from Titan and at a sun-Titan-Spacecraft, or Phase, Angle of 44°.
Image scale is roghly 8 Km (4,968 miles) per pixel".MareKromium
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Titan-PIA06139-PCF-LXTT-1.jpgTitan (Enhanced Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)181 visitenessun commentoMareKromium
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Titan-Clouds-PIA06157.jpgTitanian Clouds (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)176 visiteCaption NASA originale:"The Clouds seen here are at about 38° South Latitude on Titan. The Clouds across the middle of the frame extend about 250 Km (approx. 155 miles). The image scale is about 0,6 Km (approx. 0,4 miles) per pixel". MareKromium
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Titan-Lakes-Unnamed_North_Polar_Lake-PIA12481.jpgReflection of Sunlight off a Titanian Northern Lake (Natural Colors; credits: NASA/JPL/University of Arizona/DLR)171 visiteThis image shows the first flash of sunlight reflected off a lake on Saturn's moon Titan. The glint off a mirror-like surface is known as a specular reflection. This kind of glint was detected by the visual and infrared mapping spectrometer (VIMS) on NASA's Cassini spacecraft on July 8, 2009. It confirmed the presence of liquid in the moon's northern hemisphere, where lakes are more numerous and larger than those in the southern hemisphere. Scientists using VIMS had confirmed the presence of liquid in Ontario Lacus, the largest lake in the southern hemisphere, in 2008.
The northern hemisphere was shrouded in darkness for nearly 15 years, but the sun began to illuminate the area again as it approached its spring equinox in August 2009. VIMS was able to detect the glint as the viewing geometry changed. Titan's hazy atmosphere also scatters and absorbs many wavelengths of light, including most of the visible light spectrum. But the VIMS instrument enabled scientists to look for the glint in infrared wavelengths that were able to penetrate through the moon's atmosphere. This image was created using wavelengths of light in the 5 micron range.
By comparing the new image to radar and near-infrared light images acquired from 2006 to 2008, Cassini scientists were able to correlate the reflection to the southern shoreline of a Titan lake called Kraken Mare. The sprawling Kraken Mare covers about 400,000 square kilometers (150,000 square miles). The reflection appeared to come from a part of the lake around 71 degrees north latitude and 337 degrees west latitude.
It was taken on Cassini's 59th flyby of Titan on July 8, 2009, at a distance of about 200,000 kilometers (120,000 miles). The image resolution was about 100 kilometers (60 miles) per pixel. Image processing was done at the German Aerospace Center in Berlin and the University of Arizona in Tucson.
MareKromium
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Titan-IMG001935-PCF-LXTT.jpgTitan during Fly-By n. 9 (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)171 visiteOriginal NASA caption:"This image was taken on December 26, 2005 and received on Earth December 27, 2005. The camera was pointing toward TITAN that, at the time, was approximately 57.509 Km (about 35.734 miles) away.
This image was taken using the CB3 and CL2 filters and has not been validated or calibrated".MareKromium
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Titan-PIA22481-1.jpgThe Great Seas and Lakes of Titan170 visiteCaption NASA:"During NASA's Cassini mission's final distant encounter with Saturn's giant moon Titan, the Spacecraft captured this view of the truly enigmatic moon's North Polar landscape of Lakes and Seas, which are filled with liquid Methane and Ethane.
Punga Mare (about 240 miles, or approx. 386,2 Km, across) is seen just above the center of the mosaic, with Ligeia Mare (roughly 300 miles, or about 48,3 Km, wide) below center and vast Kraken Mare stretching off 730 miles (such as approx. 1.174,8 Km) to the left of the mosaic. Titan's numerous smaller and still Unnamed Lakes can be seen around the seas and scattered around the right side of the mosaic. Among the ongoing mysteries about Titan is how these Seas and Lakes are formed.
Another mystery at Titan has been the weather. With its extremely dense Atmosphere, Titan has a Methane Cycle much like Earth's Water Cycle of evaporation, cloud formation, rainfall, surface runoff into Rivers, and collection in Lakes and Seas.
During Titan's Southern Summer, the Cassini Spacecraft also observed Cloud activity over the South Pole.
However, typical of observations taken during Northern Spring and Summer, the view here reveals only a few small clouds. They appear as bright features just below the center of the mosaic, including a few above Ligeia Mare.
The images in this mosaic were taken with the ISS Narrow-Angle Camera, using a spectral filter sensitive to wavelengths of Near-InfraRed Light centered at 938 nanometers.
They were captured on Sept. 11, 2017, during Cassini's last encounter with Titan. Four days later, Cassini was deliberately plunged into the Atmosphere of Saturn.
The view was obtained at a distance of approximately 87.000 miles (a little less than 140,013 Km) from Titan. Image scale is about 0,5 miles (approx. 800 meters) per pixel.
The image is an Orthographic Projection centered on 67,19° North Latitude and 212,67° West Longitude.
Note: an Orthographic View is most like the view seen by a distant observer looking through a telescope".MareKromium
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