| Piú viste - Saturn: the "Ringed Beauty" and His Moons |
Japetus-N00092098.jpgJapetus' Terminator (possible natural colors; elab. Lunexit)55 visiteCaption NASA:"N00092098.jpg was taken on September 10, 2007 and received on Earth September 12, 2007. The camera was pointing toward Japetus that, at the time, was approx. 75.670 Km away, and the image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated".MareKromium
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Japetus-N00092243.jpgA VERY deep scar on Japetus' Face (possible natural colors; elab. Lunexit)55 visiteCaption NASA:"N00092243.jpg was taken on September 10, 2007 and received on Earth September 12, 2007. The camera was pointing toward Japetus that, at the time, was approximately 23.404 Km away, and the image was taken using the CL1 and CL2 filters. This image has not been validated or calibrated".MareKromium
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Japetus-Orbit-01.jpgPolar view of Japetus's orbit55 visitenessun commentoMareKromium
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Saturn-N00092694.jpgSaturnian Turbulence (Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)55 visiten.a.d.MareKromium
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Enceladus-N00093658.jpgFountains in the Darkness...55 visitenessun commentoMareKromium
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Japetus-PIA08376-2.jpgRising Japetus (possible natural colors - elab. Lunexit)55 visitenessun commentoMareKromium
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Japetus-PIA08380.jpgThe "Transition Region of Japetus" (possible natural colors - elab. Lunexit)55 visiteSoaring above the alien, icy wastelands of Saturn's moon Japetus, NASA's Cassini spacecraft captured a series of HR images of the Transition Region from dark to bright terrain at Southern Middle Latitudes that have been mosaicked together in this view.
An important characteristic of the terrain in the boundary region is that the isolated bright patches are mainly found on slopes facing toward the bright Trailing Hemisphere or toward the South Pole. The same polarity is found within the bright terrain, where the dark material can be seen at the bottom of craters and on Equator-facing slopes. These indicate that thermal effects are at play in painting the surface of Japetus.
The mosaic consists of 8 image footprints across the surface of Japetus. The view is centered on terrain near 38,6° South Latitude, 171,3° West Longitude. Image scale is approx. 52 meters (171 feet) per pixel.
The clear spectral filter images in this mosaic were obtained with the Cassini spacecraft narrow- angle camera on Sept. 10, 2007, at a distance of approx. 5,000 Km (about 3.100 miles) from Japetus.
MareKromium
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Japetus-N00091967-1.jpgImage-Artifact or a New Tower on Japetus?55 visiteUn nuovo e bellissimo esempio di quanto sia importante avere degli Amici Lettori i quali non si limitano a "guardare", ma che "cercano": in questo frame CASSINI, infatti, il bravissimo Antonio Fedele ha individuato due dettagli sui quali ha chiesto il nostro parere. Ebbene, se il dettaglio visibile sulla Dx del frame è, a nostro avviso, la traccia di un semplice Raggio Cosmico, il dettaglio di Sx è MOLTO più intrigante!
Osservate bene: nel frame originale NASA in b/n, la carenza di contrasto e la scarsa raffinazione del frame non permettevano grandi osservazioni; ma nel frame risultante da nostro coloring ed additional processing, il Sig. Fedele ha visto qualcosa che a noi era completamente sfuggita: ha visto un qualcosa che sembra essere una sorta di "Torre". Noi, allora, abbiamo ripreso il frame originale e tentato una verifica: ebbene la "Torre" non è il prodotto del nostro additional processing: essa, infatti, era già (sia pure solo appena) visibile nel frame di partenza.
Che cos'è? E' il Secondo Monolito di Giapeto (il primo venne individuato, ci pare, dal Prof. Hoagland, qualche anno fa)?
E' una Struttura Colonnare affine alle Blair Cuspids? E' qualcosa di simile al Monolito di Phobos? O forse è una Struttura Effimera o, magari, solo un image-artifact?
A noi non sembra un image-artifact (anche se non possiamo escluderlo al 100%). Poi, per quanto attiene la natura di questo (se reale) incredibile rilievo Giapetiano, non ci sentiamo di esprimerci: abbiate pazienza, ma gli elementi che abbiamo sono davvero troppo pochi e l'immagine, in sè, non è sufficiente per risolvere i nostri dubbi.
Un GRANDE complimento al Sig. Fedele e, per il resto, provate Voi stessi a guardare, analizzare e speculare...Se volete. Noi siamo qui, per condividere e commentare le Vostre (eventuali) scoperte!MareKromium
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Saturn-PIA08388.jpgLooking at the Giant55 visiteSaturn sits nested in its rings of ice as Cassini once again plunges toward the graceful giant. This natural color mosaic was acquired by the Cassini spacecraft as it soared 39° above the unilluminated side of the Rings.
Little light makes its way through the Rings to be scattered in Cassini's direction in this viewing geometry, making the Rings appear somewhat dark compared to the reflective Planet. The view can be contrasted with earlier mosaics designed to showcase the Rings rather than the Planet, which were therefore given longer exposure times.
Bright clouds play in the blue-gray skies of the North. The Ring shadows continue to caress the Planet as they slide farther South toward their momentary disappearance during Equinox in 2009.
The Rings' reflected light illuminates the Southern Hemisphere on Saturn's night side.
The scene is reminiscent of the parting glance of NASA's Voyager 1 as it said goodbye to Saturn in 1981 (see PIA00335). Cassini, however, will continue to orbit Saturn for many years to come.
Three of Saturn's moons are visible in this image: Mimas (about 397 Km across) at the 2 o'clock position, Janus (about 181 Km across) at the 4 o'clock position and Pandora (about 84 Km across) at the 8 o'clock position. Pandora is a faint speck just outside the narrow F-Ring.
This mosaic was constructed from wide-angle camera images taken just before the narrow-angle camera mosaic PIA08389.
The view combines 45 images -- 15 separate sets of red, green and blue images -- taken over the course of about two hours, as Cassini scanned across the entire Main Ring System.
The images in this view were obtained on May 9, 2007, at a distance of approx. 1,1 MKM (about 700.000 miles) from Saturn.
Image scale is about 62 Km (approx. 39 miles) per pixel. MareKromium
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Tethys-PIA08400.jpgOdysseus is looking up!55 visiteThe vast expanse of the crater Odysseus spreads out below Cassini in this mosaic view of Saturn's moon Tethys.
The crater (about 450 Km or approx. 280 miles across) is a remarkably well-preserved example of an ancient multi-ringed impact basin: the outer ring is defined by steep, cliff-like walls that descend to generally broad internal terraces. The inner ring is formed by a prominent, crown-shaped, 140-Km (88-mile) diameter circular band of icy mountains. Multi-ring basins are seen on rocky bodies as well as icy ones.
The complex internal structure and multi-ringed nature of these very large basins are believed to arise from the rebound of intense shock waves that penetrated the body at the time of impact.
This mosaic was assembled from four clear filter, narrow-angle camera images. The view is an orthographic projection centered on 3° South Latitude, 119° West Longitude and has a resolution of 572 meters (0,35 mile) per pixel. An orthographic view is most like the view seen by a distant observer looking through a telescope. North is up.
The view was obtained by the Cassini spacecraft on Aug. 30, 2007, from a distance of approximately 97.000 Km (about 60.000 miles) and at a Sun-Tethys-Spacecraft, or phase, angle of 51°.MareKromium
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Japetus-PIA08403.jpgMiddle Northern Latitudes of Japetus55 visiteCassini soars above the many pits and basins in the rolling landscape of Saturn's moon Japetus. This mosaic view looks out onto an area close to the Northern bright/dark boundary, but still within the Dark Region, Cassini Regio.
Near upper left is a large crater with terraced walls, a mostly flat floor and a prominent group of peaks in its center. The sharp features make this likely one of the youngest craters in this area of Japetus. Cassini imaged another similarly flat-floored and relatively fresh crater during its Dec. 2004 Japetus flyby.
The mosaic consists of 3 image footprints across the surface of Japetus. The view is centered on terrain near 43,3° North Latitude, 138° West Longitude. Image scale is approx. 75 meters (246 feet) per pixel.
The clear spectral filter images in this mosaic were obtained with the Cassini spacecraft narrow-angle camera on Sept. 10, 2007, at a distance of approx. 13.500 Km (about 8.400 miles) from Japetus and at a Sun-Japetus-Spacecraft, or phase, angle of 139°.MareKromium
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Sky-N00097768.jpgStar-trail; moon-trail or in-transit UFO?55 visiteCaption NASA:"N00097768.jpg was taken on November 24, 2007 and received on Earth November 25, 2007. The camera was pointing toward JAPETUS that, at the time, was approx. 1.401.647 Km away, and the image was taken using the CL1 and IR1 filters. This image has not been validated or calibrated".MareKromium
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