| Piú votate - Titan: The "Foggy" Moon |
Titan-PIA11567.jpgTitan's Atmosphere... (Natural Colors; credits: Lunar Explorer Italia)73 visiteCaption NASA:"The Cassini Spacecraft looks at Saturn's largest moon, Titan, revealing its halo-like ring formed in the upper hazes of the moon's extensive Atmosphere.
This view looks toward the darkened Leading Hemisphere of Titan, but lit terrain seen here is on on the Trailing Hemisphere and anti-Saturn side of the moon.
The moon's North Pole lies on the Terminator between the illuminated and unilluminated parts of the moon. The Pole is rotated 11° to the right in this image.
The image was taken with the Cassini Spacecraft narrow-angle camera on July 5, 2009 using a spectral filter sensitive to wavelengths of UltraViolet light centered at 338 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 148°.
Image scale is roughly 8 Km (about 5 miles) per pixel".MareKromium
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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".MareKromium
(3 voti)
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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".MareKromium
(3 voti)
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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".MareKromium
(3 voti)
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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".MareKromium
(3 voti)
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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".MareKromium
(3 voti)
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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.MareKromium
(3 voti)
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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".MareKromium
(3 voti)
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Titan-N00081033.jpgFrom "RAW" to Natural Colors: Titan (credits: Dr M. Faccin)56 visitenessun commentoMareKromium
(3 voti)
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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.
MareKromium
(3 voti)
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Titan-Lakes-South_Polar_Unnamed_Lakes-PIA11147.jpgChanges in the Titanian Lakes57 visiteCaption NASA:"These mosaics of the South Pole of Saturn's moon Titan, made from images taken almost one year apart, show changes in dark areas that may be lakes filled by seasonal rains of liquid hydrocarbons.
The images on the left (unlabeled at top and labeled at bottom) were acquired July 3, 2004. Those on the right were taken June 6, 2005. In the 2005 images, new dark areas are visible and have been circled.
The very bright features are clouds in the lower Atmosphere (the Troposphere). Titan's clouds behave similarly to those on Earth, changing rapidly on timescales of hours and appearing in different places from day to day. During the year that elapsed between these two observations, clouds were frequently observed at Titan's
South Pole by observers on Earth and by Cassini's imaging science subsystem (see also PIA06124).
It is likely that rain from a large storm created the new dark areas that were observed in June 2005. Some features, such as Ontario Lacus, show differences in brightness between the two observations that are the result of differences in illumination between the two observations. These mosaics use images taken in InfraRed Light at a wavelength of 938 nanometers.
The images have been oriented with the South Pole in the center (black cross) and the 0° Meridian toward the top.
Image resolutions are several kilometers per pixel".MareKromium
(3 voti)
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Titan-Shoreline_and_Drainage_Channels-01.jpgShoreline and Drainage Channels' Network on Titan (possible True Colors; credits: Lunar Explorer Italia)55 visitenessun commentoMareKromium
(3 voti)
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