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Titan-N00164130-32-EB-LXTT.jpgOn the Limb... (Superdefinition and True Colors; credits for the additional process. and color.: Elisabetta Bonora - Lunexit Team)81 visitenessun commentoMareKromium
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Titan-N00172750-N00172779-GB-LXTT.gifPassing-by... (a GIF-Movie by Dr Gianluigi Barca - Lunexit Team)208 visitenessun commentoMareKromium
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Titan-N00188978-86-MF-EB-LXTT-IPF-1.jpgPossible Aurora at Titan (Superdefinition; credits for the additional process. and color.: Elisabetta Bonora and Marco Faccin/Lunexit Team)78 visitenessun commentoMareKromium
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Titan-N00188978-86-MF-EB-LXTT-IPF-2.jpgPossible Aurora at Titan (Superdefinition and Absolute Natural Colors; credits for the additional process. and color.: Elisabetta Bonora and Marco Faccin/Lunexit Team)81 visitenessun commentoMareKromium
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Titan-N00199279-84-False_and_Natural_Color-EB-MF-LXTT-IPF.jpgVisions of Titan (Superdefinition, False Colors - Left-Sx - Calibrated Natural Colors - Right-Dx -; credits for the additional process. and color.: Elisabetta Bonora and Marco Faccin/Lunar Explorer Italia/Italian Planetary Foundation) 69 visitenessun commentoMareKromium
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Titan-N00200168-752-EB-MF-LXTT-IPF.jpgColourful Titan (Superdefinition and Extremely Enhanced Natural Colors; credits for the additional process. and color.: Elisabetta Bonora and Marco Faccin/Lunar Explorer Italia/Italian Planetary Foundation) 65 visitenessun commentoMareKromium
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Titan-North_Polar_Regions-20100304-NASA-PCF-LXTT.jpgThe North Pole of Titan (Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)114 visitenessun commentoMareKromium
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Titan-North_Polar_Regions-PIA09171.jpgStrong turbulence over Titan's North Pole55 visiteCaption NASA:"Cassini's VIMS (Visual and Infrared Mapping Spectrometer) has imaged a huge cloud system covering the North Pole of Titan.
This composite image shows the cloud, imaged at a distance of 90.000 Km (about 54.000 miles) during a Dec. 29, 2006, flyby designed to observe the limb of the moon. Cassini's VIMS scanned the limb, revealing this spectacular cloud system.
It covers the North Pole down to a Latitude of 62° North and at all observed Longitudes.
Such a cloud cover was expected, according to the atmospheric circulation models of Titan, but it had never been observed before with such details. The condensates may be the source of liquids that fill the lakes recently discovered by the radar instrument.
This image was color-coded, with blue, green and red at 2, 2,7 and 5 microns, respectively".
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Titan-PIA06107-00.jpgThe "True Colors" of Titan, according to Lunexit57 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-PIA06122_modest.jpgTitan from about 1.000.000 Km (true colors)54 visiteUn'immagine davvero molto ben definita in cui si può distinguere nettamente, nonostante la distanza della Sonda dal Pianeta sia ancora considerevole, la particolare tessitura (oltre al colore davvero curioso - grigio/viola?) degli strati alti dell'atmosfera di Titano.
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Titan-PIA06123_modest.jpgTitan from about 1.000.000 Km (true colors)54 visitePer questa immagine riteniamo maggiormente utile ed interessante offrirVi la caption NASA originale:"The image was acquired at a distance of about 1 million kilometers (621,371 miles) in a near ultraviolet filter that is sensitive to scattering by small particles. The Sun preferentially illuminates the southern hemisphere at this time; the north polar region is in darkness. The well-known global detached haze layer, hundreds of kilometers above Titan's surface, is produced by photochemical reactions and is visible as a thin ring of bright material around the entire planet. At the northern high-latitude edge of the image, additional striations are visible, caused by particulates that are high enough to be illuminated by the Sun even though the surface directly below is in darkness. These striations may simply be caused by a wave propagating through the detached haze, or they may be evidence of additional regional haze or cloud layers not present at other latitudes".
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Titan-PIA06125_modest.jpgTitan's fly-by "A"53 visiteCaption originale tratta dal Sito "Cassini-Huygens": "These 3 pictures were created from a sequence of images acquired by Cassini's imaging science subsystem on Oct. 25, 2004, 38 hours before its closest approach to Titan. (...) The processed images reveal sharp boundaries between dark and light regions on the surface; there are no shadows produced by topography in these images. The bright area on the center right is Xanadu, a region that has been observed previously from Earth and by Cassini. To the west of Xanadu lies an area of dark material that completely surrounds brighter features in some places. Narrow linear features, both dark and bright, can also be seen. It is not clear what geologic processes created these features, although it seems clear that the surface is being shaped by more than impact craters alone".
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