| Piú votate - Titan: The "Foggy" Moon |
Titan-Clouds-Rain_Clouds-PIA12819.jpgThe "Rain Season" on Titan164 visiteCaption NASA:"Images from NASA's Cassini Spacecraft show changes caused by Methane Rain in the bright Adiri Region near the Equator of Saturn's largest moon, Titan.
Although no Clouds are present in these images, the changes wrought by recent Methane Rainstorms are visible. These images show areas of brightened Terrain within the already bright Region known as Adiri. Adiri's Terrain appears near the center of these frames.
The dark, low-lying Dunefield known as Belet extends West from the left of these frames. Terrain South of Belet was soaked by Methane Rains in late 2010 (Adiri and Belet have different brightnesses because they - most likely - have different compositions).
The first image, panel A on the left, was taken on May 13, 2007, and shows what this area looked like earlier in the Cassini Mission.
Panels B and C were both captured on Jan. 15, 2011, 15 hours apart. New bright areas (within the white outlines of panels B and C) are thought to be on or near the Surface of the Planet.
These bright objects are not high altitude Clouds because they do not drift during the 15 hours between when panel B and panel C were taken.
Scientists are still analyzing the findings, but these brightened spots could be low-lying Fog or Clouds in areas with higher amounts of moisture on the Surface.
They could also possibly be Terrain that has been washed clean by Methane Rains (the bright spots did not become brighter in the 15 hours between panels B and C. They appear brighter only because of a change in the so-called "Viewing Geometry").
Titan's weather has been changing with the Seasons, and Storms now are more common at low Latitudes such as those observed here.
These images were re-projected, and the view in each is centered on terrain at 7° South Latitude and 215° West Longitude.
These images were taken with the Cassini Spacecraft narrow-angle camera using a spectral filter sensitive to wavelengths of Near-InfraRed Light centered at 938 nanometers. The views were obtained at a range of distances from approx. 150.000 Km (93.150 miles) to approx. 997.000 Km (619.137 miles) from Titan.
Scale is about 7 Km (4,3469 miles) per pixel in these re-projected images".MareKromium
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Titan-W00039678.jpgCrescent Titan (Enhanced Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)247 visitenessun commentoMareKromium
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Titan-W00039722.jpgThrough the Fogs... (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)97 visitenessun commentoMareKromium
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Titan-Clouds-PIA13400-PCF-LXTT.jpgTitanian Clouds (Absolute Natural Colors; credits for the additional process. and color.: NASA/JPL/University of Arizona/University of Nantes/University of Paris Diderot and Dr Paolo C. Fienga - Lunexit Team)127 visitenessun commentoMareKromium
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Titan-PIA12664.jpgTitanian "Aura" (Natural - but enhanced - Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)54 visiteCaption NASA:"Sunlight scattering through the periphery of Titan's Atmosphere reaches Cassini as the Spacecraft's camera is pointed at the dark side of the Planet. A detached, high-altitude global haze layer encircles the Planet. This view looks toward the Leading Hemisphere of Titan. North on Titan is up.
The image was taken with the Cassini Spacecraft narrow-angle camera on April 2, 2010 using a spectral filter sensitive to wavelengths of UltraViolet Light centered at 338 nanometers. The view was acquired at a distance of approx. 1,5 MKM (about 932.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 153°.
Image scale is roughly 9 Km (about 5,7 miles) per pixel".MareKromium
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Titan-Clouds-EB-LXTT.gifExtremely Bright Clouds Formation over Aztlan and Senkyo (a GIF-Movie by Elisabetta Bonora - Lunexit Team)58 visitenessun commentoMareKromium
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Titan-N00155017-21-44-EB-LXTT2.jpgNot Only "Yellow"... (an Image-Mosaic in Natural Colors by Elisabetta Bonora - Lunexit Team)95 visitenessun commentoMareKromium
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Titan-N00155017-21-44-EB-LXTT.jpgThrough the Clouds... (an Image-Mosaic by Elisabetta Bonora - Lunexit Team)87 visitenessun commentoMareKromium
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Titan-PIA11610.jpgEclipsed Titan (Natural Colors; credits: Lunexit)66 visiteCaption NASA:"Titan becomes obscured as it moves into eclipse by Saturn. Using a camera filter sensitive to Near-InfraRed light, this image manages to show albedo features on the moon. For a view of Titan in eclipse taken in visible light, see PIA11508.
As it moves into Saturn's shadow, Titan is lit by two sources. Most of the light comes from refracted Sunlight passing through the edge of Saturn's Atmosphere, but Sunlight reflected off the Planet's Rings also reaches the moon.
This view looks toward the Trailing Hemisphere of Titan. North on Titan is up and rotated 28° to the left.
The image was taken with the Cassini Spacecraft narrow-angle camera on Sept. 11, 2009 using a spectral filter sensitive to wavelengths of Near-InfraRed light centered at 938 nanometers. The view was acquired at a distance of approx. 2,5 MKM (such as about 1,6 MMs) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 85°.
Image scale is roughly 15 Km (a little more than 9 miles) per pixel".MareKromium
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Titan-Clouds-02.jpgTitan's South Polar Cloud Burst55 visiteThis InfraRed image of Saturn's moon Titan shows a large burst of clouds in the moon's South Polar Region. These clouds form and move much like those on Earth, but in a much slower, more lingering fashion, new results from NASA's Cassini Spacecraft show.
This image is a color composite, with red shown at a 5-micron wavelength, green at 2.7 microns and blue at 2 microns. An InfraRed color mosaic is also used as a background image (red at 5 microns, green at 2 microns, blue at 1.3 microns).
The images were taken by Cassini's visual and InfraRed Mapping Spectrometer during a flyby of Titan on March 26, 2007, known as T27.
Titan's Southern Hemisphere still shows a very active meteorology (the cloud appears in white-reddish tones) even in 2007. According to climate models, these clouds should have faded out since 2005.
Scientists have monitored Titan's Atmosphere for 3-and-a-half years, between July 2004 and December 2007, and observed more than 200 clouds.
The way these clouds are distributed around Titan matches scientists' global circulation models. The only exception is timing — clouds are still noticeable in the Southern Hemisphere while Fall is approaching.
Scientists will continue to observe the long-term changes during Cassini's extended mission, which runs until the fall of 2010.MareKromium
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Titan-PIA11479.jpgTitan (Natural Colors; credits: Lunar Explorer Italia)62 visiteCaption NASA:"Caption NASA:"This Cassini Spacecraft image affords a view of Titan's South Polar Region: an area home to one of Titan's hydrocarbon "Lake Districts".
Titan's South Pole is illuminated to the right of the Terminator, near the bottom of the visible disk. The dark area near the bottom, in Titan's Mid-Southern Latitudes, is Mezzoramia.
The wider, darker region near the Equator is named Senkyo. A "Lake District" (see also PIA11147) containing what scientists believe are lakes of hydrocarbons has been found surrounding Titan's South Pole.
Lit Terrain seen here is on the Saturn-facing Side of Titan. North on Titan is up and rotated 27° to the right.
The image was taken with the Cassini Spacecraft narrow-angle camera on Feb. 15, 2009 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 MKM (such as about 746.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 55°.
Image scale is roughly 7 Km (about 4 miles) per pixel".MareKromium
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Titan-Clouds-Night_Clouds-GIFMovie-W00002325-W00002338.gifNoctilucent Clouds over Titan (GIF-Movie; credits: Dr G. Barca)56 visiteDavvero molto interessanti le deboli Surface Features che si intravedono in questo breve - ma assai suggestivo - GIF-Movie realizzato dal Dr Barca. Sapreste individuarne almeno una?MareKromium
(2 voti)
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