| Piú viste - Titan: The "Foggy" Moon |
Titan-Clouds-White_Clouds-PIA08736.jpgThe "White Clouds" of Titan60 visiteCaption NASA originale:"This image depicts Saturn's moon Titan as seen by the Visual and Infrared Mapping Spectrometer (VIMS) after the closest approach of July 22, 2006 (fly-by n. 16).
The image was generated using the 5 micron wavelength for red, the 2 micron wavelength for green and the 1,2 micron wavelength for blue. The clouds are of the same type seen previously and reported in the journal "Science".
The image shows the clouds spreading out along the 40° South Latitude line.
This image was taken from a distance of about 160.000 Km (roughly 99.000 miles) from Titan".
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Titan-PIA06107-00.jpgThe "True Colors" of Titan, according to Lunexit60 visiteLa NASA, allorchè si tratta di colorizzare Titano, oscilla fra il giallo/arancio (come ben si vede nei frames Voyager), il giallo "canarino", con bordi bluastri (si vedano i primi frames Cassini, tipo PIA06089) ed una colorazione ambigua che potremmo definire giallo/salmonato, con bordi verde chiaro (ultimi frames Cassini, tipo PIA08351). Ma la NASA ha le idee chiare in tema di colori? Diremmo proprio di no, ed a nulla valgono le precisazioni che vengono fatte allorchè la NASA stessa precisa le diverse lunghezze d'onda impiegate per le colorizzazioni (jargon&tecnochiacchiere, nulla di più).
E allora?
E allora subentra - ancora una volta - il buon senso e l'osservazione telescopica (sia da Terra, sia HST). Risultato: Titano è (globalmente) color giallo-pallido, con toni più chiari ed accesi nelle sue Regioni Nord Polari e più sbiaditi in quelle Equatoriali.
Ed i bordi blu e verdi? Ed i bianchi accesi? E gli arancioni? Beh, se la NASA "li vede", vuol dire che ci saranno; ma noi non li "vediamo", neppure filtrando banda-per-banda i loro stessi color-frames e quindi...Questo è Titano, secondo noi, in "colori naturali" (ossìa come li vedremmo se ci trovassimo nei suoi pressi).
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Titan-Craters-Unnamed_Crater-PIA09175.jpgFresh Crater on Titan?60 visiteCaption NASA:"This radar image of Titan shows a semi-circular feature that may be part of an impact crater. Very few impact craters have been seen on Titan so far, implying that the surface is young. Each new crater identified on Titan helps scientists to constrain the age of the surface.
Taken by Cassini's radar mapper on Jan. 13, 2007, during a flyby of Titan, the image swath revealed what appeared to be the northernmost half of an impact crater. This crater is roughly 180 Km (about 110 miles) wide. Only three impact craters have been identified on Titan and several others, like this one, are likely to also have been caused by impact. The bright material is interpreted to be part of the crater's ejecta blanket, and is likely topographically higher than the surrounding plains. The inner part of the crater is dark, and may represent smooth deposits that have covered the inside of the crater.
This image was taken in synthetic aperture mode and has a resolution of approx. 350 mt (1150 feet). North is toward the top left corner of the image, which is approx. 240 Km (about 150 miles) wide by 140 Km (90 miles) high. The image is centered at about 26,5° North and 9° West".
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Titan-Regions-Sinlap_Region-LS28_PSS_LASoderblom_VIMSRADAR20070323.jpgSinlap Region and Guabonito Crater60 visiteIn this composite image, Titan’s surface areas are correlated.
The top pair is composed by Cassini’s radar images, while the bottom pair shows Cassini’s VIMS images. Each of the four panels corresponds to an area about 200 Km wide.
The left views show the Sinlap Crater; the brown features in the bottom panel correspond to the large dune fields visible in the top panel.
The right views show the Guabonito Region situated at about 150 Km East of the Huygens Landing Site. MareKromium
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Titan-Surface-34-PIA06440.jpgOn the Surface... (Natural Colors; credits: Lunar Explorer Italia)60 visitenessun commentoMareKromium
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Titan-PIA11522.jpgSenkyo (Natural Colors; credits: Lunar Explorer Italia)60 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
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Titan-Volcanic_Features-PIA12111.jpgSouth Polar Basin60 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
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Titan-PIA11594.jpgNorthern Layers (UV + Natural Colors; credits: Lunexit)60 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
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Titan-Seas-Kraken_Mare-PIA11626-01.jpgKraken Mare (the Map)60 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
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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)60 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
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Titan-EB.gifTitan (highly overexposed) with Startrails and a really bizarre "Light-Shadows' Effect" (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)60 visitenessun commentoMareKromium
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Titan_and_Janus-MF-LXTT.jpgDo dimensions count? (an Image-Mosaic in Natural Colors by Dr Marco Faccin - Lunexit Team)60 visitenessun commentoMareKromium
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