| |
| Ultimi arrivi - Titan: The "Foggy" Moon |
Titan-PIA11560.jpgTitan (Natural Colors; credits: Lunexit)68 visiteCaption NASA:"The Cassini Spacecraft charts a quartet of dark albedo features on the moon Titan. From upper left to lower right of the image are Fenzal, Aztlan, Aaru and Senkyo.
This view looks toward the Saturn-facing side of Titan; North is up and rotated 16° to the right.
The image was taken with the Cassini Spacecraft narrow-angle camera on June 9, 2009 using a spectral filter sensitive to wavelengths of near-infrared light centered at 938 nanometers. The view was obtained 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 26°.
Image scale is 7 kilometers (4 miles) per pixel".MareKromiumAgo 18, 2009
|
|
Titan-Lakes-South_Polar_Unnamed_Lake-PIA12162.jpgLake-like Feature near the South Pole of Titan57 visiteCaption NASA:"This mosaic of image swaths from Cassini's Titan Radar Mapper, taken with the Synthetic-Aperture Radar (SAR), features a large Dark Region several hundred kilometers across that differs in several significant ways from potential lakes observed on Titan.
It is not as dark to the radar as many lakes (including lakes seen here), and the nature of the margin is unusual. It has many characteristics in common with lakes, including its channels and interior, yet its differences distinguish it from other similar features. Some similarities are seen with the dark feature in Titan pass T7 (see PIA03563).
At top (North), the feature has characteristics of a shoreline, with round bay-like margins and channels that drain into it; at left (West) and right (East) it is rimmed by bright, feathery, branching channel-like structures, some of which extend for tens of kilometers. Within the Dark Feature some details can be seen, some of which seem to be extensions of the channels draining into the Dark Feature.
The mosaic is near the South Pole, centered near 82° South and 205° West. It includes data from Titan passes T39, T55, T57, T58, and T59, collected between December 2007 and July 2009. The individual swaths vary in resolution and illumination angle, so the edges are visible and surface features look somewhat different across swath boundaries, but the regional view can still be understood. As more SAR image swaths of Titan are collected by Cassini, mosaics of those images reveal features that cannot be appreciated within the individual observations".MareKromiumAgo 07, 2009
|
|
Titan-PIA11548.jpgCrescent Titan (Natural Colors; credits: NASA/JPL/SSI)62 visiteCaption NASA:"The Cassini Spacecraft looks down on the North Pole of Titan, showing night and day in the Northern Hemisphere of Saturn's largest moon.
This view is centered on terrain at about 49° North Latitude, 243° West Longitude. The North Pole of Titan is rotated about 23° to the left and it lies on the Terminator above and to the left of the center of the image.
Images taken using red, green and blue spectral filters were combined to create this Natural Color view of Titan. The images were obtained with the Cassini Spacecraft wide-angle camera on June 6, 2009 at a distance of approx. 194.000 Km (such as about 121.000 miles) from Titan.
Image scale is roughly 11 Km (a little less than 7 miles) per pixel".MareKromiumAgo 03, 2009
|
|
Titan-PIA11542.jpgEnchanted Titan (Natural Colors; credits: Lunar Explorer Italia)57 visiteCaption NASA:"The Cassini Spacecraft looks toward Fensal and Aztlan, two dark areas near the Equator of Titan.
Like other albedo features on Titan, these areas are named after enchanted places or paradises from legends and myths from the World's Cultures. Fensal, the name of the area on the left, is a magnificent mansion in Norse mythology. Aztlan, the name of the dark area on the right of the image, is an Aztec mythical land.
Lit Terrain seen here is mostly on the Leading Hemisphere of Titan. North on Titan is up and rotated 38° to the left.
The image was taken with the Cassini Spacecraft narrow-angle camera on May 25, 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. 1,3 MKM (about 808.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 25°.
Image scale is roughly 8 Km (about 5 miles) per pixel".MareKromiumLug 26, 2009
|
|
Titan-Volcanic_Features-PIA12111.jpgSouth Polar Basin55 visiteCaption NASA:"An enigmatic large Basin appears in the South Polar Region of Saturn's moon Titan at the center of this Titan Radar Mapper image from NASA's Cassini Spacecraft acquired on June 22, 2009.
The Basin has several possible origins.
It may be a Volcanic Caldera, produced by collapse after cryovolcanic eruptions.
It might be a Modified Impact Basin, partially infilled with sedimentary material.
Alternately, the basin may have formed by some other collapse process related to the presence of Subsurface Methane.
Evidence for lakes elsewhere on Titan suggests that it might have been later partially filled with liquid Methane and Ethane".
MareKromiumLug 19, 2009
|
|
Titan-PIA11526.jpgTitan's "Atmospheric Halo" (Natural Colors; credits: Lunar Explorer Italia)62 visiteCaption NASA:"The Cassini Spacecraft looks down on Titan's North Pole and unveils the moon's upper-most Atmospheric Hazes, creating the appearance of a halo around Saturn's largest moon.
Terrain seen here is on the Trailing Hemisphere of Titan, which is facing Saturn. This view is centered on 54° North Latitude and 251° West Longitude.
Titan's north pole lies on the Terminator, about one-third of the way inward from the top of the image.
The image was taken in Violet Light with the Cassini Spacecraft wide-angle camera on May 21, 2009. The view was obtained at a distance of approx. 147.000 Km (such as about 91.000 miles from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 121°.
Image scale is roughly 9 Km (a little les than 6 miles) per pixel".MareKromiumLug 05, 2009
|
|
Titan-PIA11522.jpgSenkyo (Natural Colors; credits: Lunar Explorer Italia)57 visiteCaption NASA:"The Cassini Spacecraft examines the dark region of Senkyo on Saturn's largest moon, Titan. Senkyo is in the center of the image, and it lies just south of the moon's equator. For an earlier view of this Region, see PIA08231.
Lit terrain seen here is on the Saturn-facing side of Titan. North on Titan is up and rotated 6° to the left.
The image was taken with the Cassini Spacecraft narrow-angle camera on March 21, 2009 using a spectral filter sensitive to wavelengths of near-InfraRed Light centered at 938 nanometers.
The view was obtained at a distance of approx. 994.000 Km (about 618.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 63°.
Image scale is roughly 6 Km (a little less than 4 miles) per pixel".MareKromiumGiu 26, 2009
|
|
Titan-Clouds-01.jpgTitan's Lingering Clouds57 visiteLots of clouds are visible in this InfraRed image of Saturn's moon Titan. 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.
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.
Three false-color images make up this mosaic and show the clouds at 40 to 50° mid-Latitude. The images were taken by Cassini's Visual and InfraRed Mapping Spectrometer during a close flyby of Titan on Sept. 7, 2006, known as T17.
Each image is a color composite, with red shown at the 2-micron wavelength, green at 1.6 microns and blue at 2.8 microns. An infrared color mosaic is also used as a background (red at 5 microns, green at 2 microns and blue at 1.3 microns).
The characteristic elongated mid-Latitude clouds, which are easily visible in bright bluish tones (see close-up in the inset) are still active even late into 2006-2007. According to climate models, these clouds should have faded out since 2005.
Scientists will continue to observe the long-term changes during Cassini's extended mission, which runs until the fall of 2010.MareKromiumGiu 08, 2009
|
|
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.MareKromiumGiu 08, 2009
|
|
Titan-PIA11508.jpgTitan in Eclipse56 visiteCaption NASA:"The Cassini spacecraft captured this image of a dimly lit Titan as Saturn's largest moon was eclipsed by the Planet.
This view looks up toward the South Pole of Titan which lies on the Terminator about a quarter of the way inward from the right of the visible disk. Lit terrain seen here is on the Saturn-facing side of Titan. In Saturn's shadow, the Southern Hemisphere of Titan is lit by two sources: sunlight scattered through the Planet's Rings and refracted sunlight passing through the edge of Saturn's Atmosphere.
Stars in this image are smeared by the long camera exposure time of 560" needed to capture the faint light on Titan. The image was taken in Visible Light with the Cassini Spacecraft wide-angle camera on May 7, 2009. The view was acquired at a distance of approx. 667.000 Km (about 414.000 miles) from Titan and at a Phase Angle of 58°.
Image scale is roughly 40 Km (about 25 miles) per pixel".MareKromiumGiu 07, 2009
|
|
Titan-PIA11501.jpgSouth Polar "Tropospheric Cloud Streaks" (Natural Colors; credits: Lunar Explorer Italia)62 visiteCaption NASA:"The Tropospheric Clouds seen in the lower left of the image are located at 45 to 55° South Latitude on Titan, and the streaks of the clouds are oriented East-West.
This view looks toward the South Pole of Titan. The South Pole lies near the Terminator about a quarter of the way inward from the Planet's limb at the bottom of this image. Lit terrain seen here is on the Leading Hemisphere of Titan.
This image was taken with the Cassini spacecraft narrow-angle camera on March 24, 2009 using a spectral filter sensitive to wavelengths of near-InfraRed Light centered at 938 nanometers. The view was obtained at a distance of approx. 1.1 MKM (about 684.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 78°. Image scale is 7 Km (a little more than 4 miles) per pixel".MareKromiumMag 29, 2009
|
|
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".MareKromiumApr 28, 2009
|
|
| 426 immagini su 36 pagina(e) |
|
|
|
|
|
13 | |
|
|
|
|
|
|
