| Piú votate - Titan: The "Foggy" Moon |
Titan-N00149992-N00150001.jpgTitan, in Time... (Natural Colors; credits: Elisabetta Bonora - Lunexit Team)54 visitenessun commentoMareKromium
(5 voti)
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Titan_and_Tethys-PIA12528.jpgMutual Event Sequence (Natural Colors; credits: NASA/JPL/Space Science Institute)58 visiteCaption NASA:"Saturn's moon Tethys with its prominent Odysseus Crater silently slips behind Saturn's largest moon Titan and then emerges on the other side.
Tethys is not actually enshrouded in Titan's Atmosphere. Tethys is more than twice as far from Cassini than Titan in this sequence: Tethys is about 2,2 MKM (such as approx. 1,4 MMs) from Cassini, while Titan is about only 1 MKM (approx. 621.000 miles) away.
These two color views were captured about 18 minutes apart, with the view on the right side taking place first.
These images are part of a so-called "Mutual Event Sequence" in which one moon passes close to or in front of another (from CASSINI point of view). Such observations help scientists refine their understanding of the orbits of Saturn's moons.
Images taken using red, green and blue spectral filters were combined to create this Natural Color view. The images were obtained with the Cassini Spacecraft narrow-angle camera on Nov. 26, 2009.
The images were obtained with the Cassini Spacecraft narrow-angle camera on Nov. 26, 2009.
Image scale is roughly 6 Km (a little less than 4 miles) per pixel on Titan and apprx. 13 Km (a little more than 8 miles) per pixel on Tethys".
MareKromium
(5 voti)
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Titan-Regions-Senkyo_Region-PIA11636.jpgThrough the Fog, in the Darkness: the Senkyo Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)57 visiteCaption NASA:"The low albedo feature known as Senkyo is (barely!) visible through the haze of Titan's Atmosphere.
See PIA08231 to learn about this area that appears dark near Titan's Equator. This view looks toward Saturn-facing Side of Titan and is centered on terrain at 1° South Lat. and 345° West Longitude. North on Titan is up and rotated 10° to the right.
The image was taken with the Cassini Spacecraft narrow-angle camera on Oct. 12, 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. 296.000 Km (about 184.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 11°.
Image scale is about 2 Km (approx. 1,3 mile) per pixel".MareKromium
(5 voti)
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Titan-N00141759_to_N00141771_RAWC-SD.jpgTitan (Superdefinition and Enhanced Natural Colors; credits for the additional process. and color.: Dr M. Faccin - Lunexit Team)56 visitenessun commentoMareKromium
(5 voti)
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Titan-Seas-Kraken_Mare-PIA11626-01.jpgKraken Mare (the Map)56 visiteKraken Mare is - so far - the largest known body of liquid on the Surface of Titan.
It was discovered in 2007 by the Cassini Probe and was so named in 2008 after the Kraken, a legendary sea monster. Kraken Mare is believed to be the largest of numerous seas and lakes in Titan's North Polar Region.
It should be a sea of Hydrocarbons whose discovery was further confirmed by Radar Imagery. Only a portion of the Kraken Sea has been imaged by radar, but its wider extent is indicated in Visible Light images that indicate a larger expanse. Kraken Mare is believed to be similar in size to the Caspian Sea. An island in the sea is named Mayda Insula.
As part of the proposed "Titan/Saturn System Mission", a probe would splash down on Kraken Mare in order to study and scrutinize its composition, depth and numerous other properties.
Nota Lunexit: "...and numerous other properties...". Quali??? Lifeforms living into it, maybe???...MareKromium
(5 voti)
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Titan-Seas-Kraken_Mare-PIA11626-00.jpgKraken Mare (Natural Colors; credits: Lunexit)56 visiteCaption NASA:"In the top right of this Cassini image, the Southern end of Titan's huge lake of liquid hydrocarbons called Kraken Mare is visible near the moon's North Pole.
See PIA11146 to learn more about Titan's lake districts and to see a map.
Near the moon's Equator are the albedo features Senkyo on the right and Aztlan on the left. This view looks toward the Saturn-Facing Side of Titan. North is up and rotated 31° to the right.
The image was taken with the Cassini Spacecraft wide-angle camera on Oct. 12, 2009 using a spectral filter sensitive to wavelengths of Near-InfraRed Light centered at 939 nanometers.
The view was acquired at a distance of approx. 252.000 Km (about 157.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 11°.
Image scale is roughly 15 Km (a little more than 9 miles) per pixel".MareKromium
(5 voti)
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Titan-PIA12320.jpgCrescent Titan (Natural Colors; credits: NASA/JPL/Space Science Institute & Lunexit)103 visiteCaption NASA:"Titan's golden, smog-like atmosphere and complex layered hazes appear to Cassini as a luminous ring around the planet-sized moon. The world beneath that haze has become slightly less mysterious under the gaze of Cassini and its Huygens probe, but many new discoveries await.
This mosaic view of Titan represents "Target 3" in the fall 2009 edition of the Cassini Scientist for a Day contest. (See http://saturn.jpl.nasa.gov/education/scientistforaday8thedition/.) The contest is designed to give students a taste of life as a scientist by challenging them to write an essay describing the value of one target choice among three for Cassini to image.
Images taken using red, blue and green spectral filters were combined to create this color view. Six images -- two sets of three colors -- were combined to create the mosaic. The images were acquired with the Cassini wide-angle camera on Oct. 12, 2009 at a distance of approx. 145.000 Km (such as about 90.000 miles) from Titan".MareKromium
(5 voti)
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Titan-PIA11603.jpgSeasonal Changes on Titan (Natural Colors; credits: NASA/JPL/Space Science Institute)54 visiteSeasonal changes in the Atmosphere of Saturn's largest moon are captured in this Natural Color image, which shows Titan with a slightly darker top half and a slightly lighter bottom half.
Titan's Atmosphere has a seasonal hemispheric dichotomy, and this image was taken shortly after Saturn's August 2009 Equinox.
Images taken using red, green and blue spectral filters were combined to create this Natural Color view.
Scientists have found that the Winter Hemisphere typically appears to have more high-altitude haze, making it darker at shorter wavelengths (UltraViolet through blue) and brighter at InfraRed wavelengths.
The switch between dark and bright occurred over the course of a year or two around the last Equinox. Scientists are studying the mechanism responsible for this change, and will monitor the dark-light difference as it flip-flops now that the 2009 Equinox has signaled the coming of Spring and then Summer in the Northern Hemisphere.
Although this hemispheric boundary appears to run directly East-West near the Equator, its position is not level with latitude and is actually offset from the Equator by about 10° of Latitude.
This view looks toward the Saturn-facing side of Titan. North on Titan is up.
The images were obtained with the Cassini Spacecraft wide-angle camera on Aug. 25, 2009 at a distance of approx. 174.000 Km (such as about 108.000 miles) from Titan.
Image scale is roughly 10 Km (a little more than 6 miles) per pixel.MareKromium
(5 voti)
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Titan-PIA11594.jpgNorthern Layers (UV + Natural Colors; credits: Lunexit)54 visiteCaption NASA:"This UltraViolet view of Titan shows the moon's North Polar "Hood" (---> cappuccio) and its detached, high-altitude haze layer. See also PIA08137 to learn more.
This view looks toward the Saturn-facing side of Titan.
North on Titan is up and rotated 2° to the left.
The image was taken with the Cassini Spacecraft narrow-angle camera on Aug. 13, 2009 using a spectral filter sensitive to wavelengths of UltraViolet Light centered at 338 nanometers. The view was acquired at a distance of approx. 2,2 MKM (about 1,4 MMs) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 61°.
Image scale is roughly 26 Km (about 16 miles) per pixel".MareKromium
(5 voti)
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Titan-Lakes-South_Polar_Unnamed_Lake-PIA12162.jpgLake-like Feature near the South Pole of Titan55 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".MareKromium
(5 voti)
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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".
MareKromium
(5 voti)
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Titan-PIA11508.jpgTitan in Eclipse54 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".MareKromium
(5 voti)
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