| Ultimi arrivi - Saturn: the "Ringed Beauty" and His Moons |
Methone-N00111933.jpgStar-Trails and Methone56 visitenessun commentoMareKromiumGiu 20, 2008
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Star_Trails-N00099969.jpgStar-Trails...58 visitenessun commentoMareKromiumGiu 20, 2008
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The_Rings-PIA10408.jpg"Spiral Density Wave" in the B-Ring (MULTISPECTRUM; credits: Lunexit)84 visiteCaption NASA:"This High-Resolution view shows, at left, a Spiral Density Wave (SDW) in Saturn's inner B-Ring. A SDW is a spiral-shaped massing of particles that tightly winds many times around the Planet. These waves decrease in wavelength with increasing distance from the Planet.
Scientists use images like this one to understand the mass of the Rings and the collisional dynamics of the Ring Particles.
The view looks toward the sunlit side of the Rings from about 50° below the Ring-Plane. The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on May 10, 2008. The view was obtained at a distance of approx. 279.000 Km (sich as about 173.000 miles) from Saturn.
Image scale is roughly 1 Km (0,6 mile) per pixel".MareKromiumGiu 20, 2008
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Janus-PIA10407.jpgJanus61 visiteCaption NASA:"Craters cover the rugged surface of Saturn's moon Janus. The view is from 42° above the moon's Equator. North on Janus (179 Km, or 111 miles across) is towards the top of the image.
The image was taken with the Cassini Spacecraft narrow-angle camera on May 17, 2008 using a combination of spectral filters sensitive to wavelengths of polarized green light centered at 617 and 568 nanometers. The view was acquired at a distance of approx. 350.000 Km (such as about 217.000 miles) from Janus and at a Sun-Janus-Spacecraft, or phase, angle of 101°.
Image scale is roughly 2 Km (a little more than 1 mile) per pixel".MareKromiumGiu 20, 2008
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Alpha_Centauri-PIA10406.jpgStellar Horizon (MULTISPECTRUM; credits: Lunexit)57 visiteCaption NASA:"The nearest Star System, the Trinary Star Alpha Centauri, hangs above the horizon of Saturn. Both Alpha Centauri A and B -- stars very similar to our own -- are clearly distinguishable in this image. (The third star in the Alpha Centauri System, the red dwarf Proxima Centauri, is not visible here).
From the orbit of Saturn, light (as well as Cassini's radio signal) takes a little more than an hour travel to Earth. The distance to Alpha Centauri is so great that light from these stars takes more than 4 years to reach our Solar System.
Thus, although Saturn seems a distant frontier, the nearest star is almost 30.000 times farther away.
This image is part of a stellar occultation sequence, during which Cassini watches as a star (or stars) as it passes behind Saturn. Light from the stars is attenuated by the uppermost reaches of Saturn's gaseous envelope, revealing information about the structure and composition of the Planet's Atmosphere.
The view was captured from about 66° above the Ring-Plane and faces southward on Saturn. Ring shadows mask the Planet's Northern Latitudes at bottom.
The image was taken in visible red light with the Cassini spacecraft narrow-angle camera on May 17, 2008. The view was obtained at a distance of approx. 534.000 Km (such as about 332000 miles) from Saturn. Image scale on Saturn is about 3 Km (approx. 2 miles) per pixel".MareKromiumGiu 19, 2008
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UnknownObject-N00111962-N00111966.gifAnother U.F.O. in the Space of Saturn! (GIF Movie - credits: Dr G. Barca)59 visiteUn altro "Filmato Didattico" il quale, stavolta, ci mostra il transito (con accelerazione quasi relativistica...) di un Oggetto Anomalo che, in accordo alla Filosofia Ispiratrice di Lunar Explorer Italia, non possiamo risolvere e dire "cosa sia", ma per il quale certo possiamo dire "che cosa NON è".
Non è un Raggio Cosmico; non è un Image-Artifact; non è "noise" nè "lack of signal" e non è una "luna saturniana in-transito".
Che cosa sarà mai?!? Questo GIF-Movie è dedicato a coloro (e sono TANTI...poverini) che credono che TUTTO sia spiegabile e risolvibile in accordo alla Umana Scienza e Conoscenza.
Ed un Complimento Grandissimo al Dr Barca per la pazienza e l'occhio!MareKromiumGiu 18, 2008
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TheRings-N00114226-N00114326.gifThe Rings, with "noise", "cosmic rays" and "unknown objects" - GIF Movie (credits: Dr Gianluigi Barca)58 visiteUno splendido filmato GIF il quale, oltre a darci la sensazione visiva del "movimento" degli Anelli (rectius: di Cassini rispetto agli Anelli), ci fornisce un gran numero di esempi di possibili Anomalìe e "disturbi" di segnale.
In tre parole: un Filmato Didattico. Congratulazioni, come sempre, al Dr Barca!
...e per gli Esperti: riuscite a distinguere alcune "Spikes"?MareKromiumGiu 18, 2008
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Enceladus-PIA10403.jpgIcy Oasis (MULTISPECTRUM-2; credits: Lunexit)62 visiteCaption NASA:"With its excess warmth, water ice jets and huge vapor plume laced with simple organic materials, Enceladus is an important part of the quest to understand environments compatible with the chemistry of life as we know it. The Sulci, or "Tiger Stripe" fractures, in the South Polar Region are visible at bottom -- the view here is parallel to the direction of the Sulci.
The view looks toward the anti-Saturn Hemisphere on the moon's Trailing Side. North on Enceladus is towards the top of the image.
This view is a composite of individual frames obtained using filters sensitive to ultraviolet (centered at 338 nanometers), green (centered at 568 nanometers) and infrared light (centered at 1002 nanometers).
The broad range of wavelengths exaggerates subtle color variations across the moon's surface.
The images were acquired with the Cassini spacecraft narrow-angle camera on May 11, 2008.
The view was obtained at a distance of approx. 739.000 Km (such as about 459.000 miles) from Enceladus and at Phase Angle of 36°.
Image scale is roughly 4 Km (about 2,5 miles) per pixel".MareKromiumGiu 14, 2008
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Tethys-PIA10400.jpgTethys (MULTISPECTRUM-2; credits: Lunexit)58 visiteCaption NASA:"The Cassini Spacecraft took a Southern view of the scarred face of icy Tethys. The moon's South Pole is at bottom center, just above the Terminator. To the left of the Pole, is Crater Melanthius, with its complex of central peaks poking upward into sunlight. On the limb at right, Ithaca Chasma extends Northward. The smoothness of the limb is interrupted at the 11 o'clock position by the rim of Crater Odysseus. A belt of darker terrain girdles the moon's Equator. (...)
Lit terrain seen here is on the Leading Hemisphere of Tethys (about 1062 Km or approx. 660 miles across). North is up, and rotated 9° to the right.
The image was taken in visible green light with the Cassini Spacecraft narrow-angle camera on May 10, 2008. The view was acquired at a distance of approx. 477.000 Km (such as about 296.000 miles) from Tethys and at a Sun-Tethys-Spacecraft angle of 44°.
Image scale is roughly 3 Km per pixel".MareKromiumGiu 12, 2008
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Tethys-PIA09915-0.jpgTethys (MULTISPECTRUM-2; credits: Lunexit)68 visiteCaption NASA:"From a highly inclined orbit, the Cassini Spacecraft looks toward far Northern Latitudes on Tethys.
Here, the spacecraft was above a position about 45° North of the moon's Equator.
This vantage point afforded a view of the moon's three most recognizable features: the Ithaca Chasma Canyon System (at lower right), Odysseus Crater (at upper left) and the Equatorial Band of Darker Terrain (at lower left).
Lit terrain seen here is on the Leading Hemisphere of Tethys (1062 Km, or approx. 660 miles across). North is up.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 29, 2008. The view was obtained at a distance of approx. 991.000 Km (such as about 616.000 miles) from Tethys and at Phase Angle of 73°.
Image scale is roughly 6 Km (about 4 miles) per pixel".MareKromiumGiu 07, 2008
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Saturn-PIA09917.jpgFrom farther North, than the North Pole...57 visiteCaption NASA:"Myriad vortices churn through Saturn's high Northern Latitudes while Dione's shadow drifts across the gas giant's face.
This view looks toward the unilluminated side of the Rings from about 43° above the Ring-Plane.
The image was taken with the Cassini Spacecraft wide-angle camera on May 7, 2008 using a spectral filter sensitive to wavelengths of infrared light centered at 752 nanometers.
The view was obtained at a distance of approx. 1,2 MKM (about 760.000 miles) from Saturn. Image scale is roughly 69 Km (about 43 miles) per pixel".MareKromiumGiu 07, 2008
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Prometheus-PIA09916.jpgSpotting Prometheus (MULTISPECTRUM; credits: Lunexit)75 visiteCaption NASA:"The flattened, potato-like form of Prometheus glides silently within the Roche Division, between Saturn's A and F-Rings.
Prometheus (86 Km, or about 53 miles across at its widest point) is on the side of the Rings closest to the Cassini Spacecraft in this view. The image looks toward the sunlit side of the Rings from about 1° below the Ring-Plane.
The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on May 2, 2008. The view was acquired at a distance of approx. 1,1 MKM (such as about 660.000 miles) from Prometheus.
Image scale is roughly 6 Km (about 4 miles) per pixel".MareKromiumGiu 06, 2008
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