| Piú votate - Saturn: the "Ringed Beauty" and His Moons |
The Rings from 6.300.000 Km.jpgThe Rings from app.x 6.300.000 Km58 visitenessun commento
(5 voti)
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Mimas-PIA01968.jpgMimas from Cassini/Huygens61 visiteMimas, in questo recente frame, sembra aver distolto il suo "sguardo" da noi e pare guardare verso l'alto, in una zona di cielo che non possiamo vedere. Ricollegandoci al commento che si faceva in precedenza, a proposito delle tecnologie possedute dal Voyager in rapporto a quelle disponibili per Cassini-Huygens, dobbiamo dire che questa immagine è sicuramente bella e chiara, ma NON più bella e più chiara di quella ottenuta dal Voyager 1 vent'anni fa!
C'è di che meditare, non è vero?!?
(5 voti)
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Tethis from Voyager 2.jpgTethis from Voyager 262 visiteTethys Data and Statistics:
Discovered by = Giovanni Domenico Cassini
Date of discovery = 1684
Mass (kg) = 7.55e+20
Mass (Earth = 1) = 1.2634e-04
Equatorial radius = 530 Km
Equatorial radius (Earth = 1) = 8.3098e-02
Mean density (gm/cm^3) = 1,21
Mean distance from Saturn = 294.660 Km
Rotational period (days) = 1,887802
Orbital period (days) = 1,887802
Mean orbital velocity (km/sec) = 11,36
Orbital inclination = 1.09°
Escape velocity (km/sec) = 0,436
Visual geometric albedo = 0,9
Magnitude (Vo) = 10,2
Mean surface temperature = -187°C
(5 voti)
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Mimas from Voyager 1.jpgMimas from Voyager 162 visiteEd eccoVi una splendida immagine di Mimas che "guarda" verso di noi. I colori di questo frame, a quanto ne sappiamo e per quanto riusciamo a capire, non sono reali (si tratta di colori impiegati per esaltare ancora di più - anche se, forse, non ce n'era bisogno...) le caratteristiche superficiali di questo mondo che giace immerso nel buio perenne. In ogni caso non possiamo non sottolineare e rimarcare la più che eccellente qualità dell'immagine di Mimas la quale è stata ottenuta con mezzi e tecnologie di gran lunga inferiori a quelle oggi messe a disposizione di Cassini-Huygens (ma la differenza, a dire il vero, non si vede!).
(5 voti)
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Hyperion from Voyager 1.jpgHyperion from Voyager 157 visitenessun commento
(5 voti)
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TITAN-N00006513.jpgTitan from Cassini-Huygens - app.x 340.000 Km away62 visitenessun commento
(5 voti)
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SATURN-N00006385.jpgThe Rings from approx. 6.990.000 Km (2)62 visitenessun commento
(5 voti)
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SATURN-N00006384.jpgThe Rings from approx. 7.000.000 Km63 visitenessun commento
(5 voti)
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Enceladus-PIA20522enceladusC.jpgCrescent Enceladus (Credits: NASA/JPL/Cassini Imaging Team)125 visitePeering from the shadows, the Saturn-facing hemisphere of tantalizing inner moon Enceladus poses in this Cassini spacecraft image. North is up in the dramatic scene captured during November 2016 as Cassini's camera was pointed in a nearly sunward direction about 130,000 kilometers from the moon's bright crescent. In fact, the distant world reflects over 90 percent of the sunlight it receives, giving its surface about the same reflectivity as fresh snow. A mere 500 kilometers in diameter, Enceladus is a surprisingly active moon. Data and images collected during Cassini's flybys have revealed water vapor and ice grains spewing from south polar geysers and evidence of an ocean of liquid water hidden beneath the moon's icy crust.MareKromium
(4 voti)
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ZZ-Falling_on_Saturn.jpgEnd of Mission (Artistic View)280 visitenessun commentoMareKromium
(4 voti)
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Atlas.jpgAtlas (Credits: Dr Marco Faccin and Elisabetta Bonora)187 visitenessun commentoMareKromium
(4 voti)
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Janus-PIA14607-PCF-LXTT-IPF.jpgClosing-up on Janus (Absokute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)91 visiteDark and deep Shadows were obscuring most part of Janus' cratered Surface, when the NASA - Cassini Spacecraft took a close look at this Saturnian moon during the Fly-By which occurred on March 27, 2012.
This view is centered on Terrain located at approx. at 13° South Latitude and 26° West Longitude. The image was taken in Visible Light with the NASA - Cassini Spacecraft Narrow-Angle Camera, at a distance of approximately 28.000 miles (such as about 45.061 Km) from Janus and at a Sun-Janus-Cassini Spacecraft , or Phase, Angle of 109°. Image scale is 892 feet (272 meters) per pixel.
This frame (which is an Original NASA - Cassini Spacecraft b/w frame published on the NASA - Planetary Photojournal with the ID n. PIA 14607) has been additionally processed, contrast enhanced, magnified and then colorized in Absolute Natural Colors (such as the colors that a human eye would actually perceive if someone were onboard the NASA - Cassini Spacecraft and then looked outside, towards the Saturnian moon Janus), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team. Different colors, as well as different shades of the same color, mean, among others, the existence of different Elements present on the Surface of Janus, each having a different Albedo (---> Reflectivity) and Chemical Composition.MareKromium
(4 voti)
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