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| Risultati della ricerca nelle immagini - "Companions" |
A - Saturn-a.jpgSaturn, Tethys and Dione in almost true colors185 visiteSaturn Data and Statistics
Mass (kg) = 5.688e+26
Mass (Earth = 1) = 9,5181e+01
Equatorial radius = 60.268 Km
Equatorial radius (Earth = 1) = 9,4494e+00
Mean density (gm/cm^3) = 0,69
Mean distance from the Sun = 1.429.400.000 Km
Mean distance from the Sun (Earth = 1) = 9,5388
Rotational period (hours) = 10,233
Orbital period (years) = 29,458
Mean orbital velocity = 9,67 Km per second
Tilt of axis = 25,33°
Orbital inclination = 2,488°
Equatorial surface gravity (m/sec^2) = 9,05
Equatorial escape velocity = 35,49 Km per second
Magnitude (Vo) = 0,67
Mean cloud temperature = - 125°C
Atmospheric pressure (bars) = 1,4
Atmospheric composition: Hydrogen 97% and Helium 3%
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Dione&Janus-PIA08158.jpgSaturn, Dione and Janus53 visiteCaption originale:"The Cassini spacecraft looks toward the Saturnian horizon as Dione and Janus glide past.
A few craters are visible on Dione, while Janus is slightly blurred due to its motion during the exposure. The Rings appear essentially edge-on in this view, as the Cassini spacecraft continues its recent activities close to the Ring-Plane.
The image was taken with the Cassini spacecraft narrow-angle camera on March 10, 2006, using a filter sensitive to wavelengths of infrared light centered at 750 nnmts. The image was acquired at a distance of approx. 2,9 MKM (about 1,8 MMs) from Saturn.
The image scale is approx. 17 Km (roughly 11 miles) per pixel".
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Jupiter-20070323.gifWatch Jupiter and some of His Moons rotate! (GIF-Movie)54 visiteCaption NASA:"South is toward the top in this frame from a stunning movie featuring Jupiter and moons recorded last Thursday from the Central Coast of New South Wales, Australia. In fact, three Jovian Moons and two red spots are ultimately seen in the full video as they glide around the Solar System's ruling gas giant. In the early frame above, Ganymede, the largest moon in the Solar System, is off the lower right limb of the Planet, while intriguing Europa is visible against Jupiter's cloud tops, also near the lower right. Jupiter's new Red Spot junior is just above the broad white band in the Planet's Southern (upper) Hemisphere. In later frames, as Planet and moons rotate (right to left), red spot junior moves behind Jupiter's left edge while the Great Red Spot itself comes into view from the right. Also finally erupting into view at the right, is Jupiter's volcanic moon, Io (...)".
Note: click on the frame to see the movie
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Mimas and Saturn-PIA06574.jpgMimas and Saturn53 visiteCaption NASA originale:"In a dazzling and dramatic portrait painted by the Sun, the long thin shadows of Saturn's rings sweep across the planet's northern latitudes. Within the shadows, bright bands represent areas where the ring material is less dense, while dark strips and wave patterns reveal areas of denser material. The shadow darkens sharply near upper right, corresponding to the boundary of the thin C-Ring with the denser B-Ring. A wide-field, natural color view of these shadows can be seen in PIA06164.
The globe of Saturn's moon Mimas (398 Km or 247 miles across) has wandered into view near the bottom of the frame. A few of the large craters on this small moon are visible. The image was taken with the Cassini spacecraft narrow angle camera on Jan. 18, 2005, at a distance of 1,4 MKM (889.000 miles) from Saturn using a filter sensitive to wavelengths of infrared light centered at 752 nanometers. The image scale is 9 Km (approx 5,5 miles) per pixel".
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Rings-PIA06588.jpgThe "rings" and a "string" of Moons...53 visiteCaption NASA originale:"Moons visible in this image: Mimas (398 Km, or 247 miles across) at right, Pandora (84 Km, or 52 miles across) near center and Janus (181 Km, or 113 miles across) in the lower left corner. Mimas' orbit inclination of 1,6° relative to Saturn's equator is enough to make it appear as if it orbits just beyond the F-Ring when viewed from this vantage point of 5° below the Rings. In fact, it is 34.000 Km (such as approx. 21.000 miles) more distant than Janus".
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Saturn&Friends-PIA08220.jpgOne in the Shadows, one in the Lights53 visiteCaption NASA originale:"The unlit side of the Rings glows with scattered Sunlight as two moons circle giant Saturn. The light reaching Cassini in this view has traveled many paths before being captured.
At left, Mimas (397 Km, or 247 miles across) presents its "Dark Side". Enceladus (505 Km, or 314 miles across), on the Far Side of the Rings, is lit by "Saturnshine," or reflected sunlight coming from the planet. Saturn, in turn, is faintly lit in the south by light reflecting off the Rings.
Saturn's shadow darkens the Rings, tapering off toward the left side of this view.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 11, 2006 at a distance of approx. 3,9 MKM (about 2,5 MMs) from Mimas, 4,3 MKM (approx. 2,7 MMs) from Enceladus and 4,1 MKM (about 2,6 MMs) from Saturn.
Image scale is roughly 25 Km (approx. 16 miles) per pixel on Saturn".
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Saturn&Titan-N00060957.jpgSo close and yet so far...53 visitenessun commento
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Saturn&Titan-PIA07786.jpgSo close and yet so far...53 visiteThe Cassini spacecraft delivers this stunning vista showing small, battered Epimetheus and smog-enshrouded Titan, with Saturn's A and F Rings stretching across the scene. The prominent dark region visible in the A-Ring is the Encke Gap, in which the moon Pan and several narrow ringlets reside. Moon-driven features that mark the A-Ring are easily seen to the left and right of the Encke Gap. The Encke Gap is about 325 Km (approx. 200 miles) wide. Pan is approx. 26 Km (about 16 miles) across. In an optical illusion, the narrow F-Ring, outside the A-Ring, appears to fade across the disk of Titan. A couple of bright clumps can be seen in the F-Ring. Epimetheus is approx. 116 Km (about 72 miles) across and giant Titan is roughly 5.150 Km (about 3.200 miles) across.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 28, 2006, at a distance of approx. 667.000 Km(about 415.000 miles) from Epimetheus and 1,8 MKM (about 1,1 MMs) from Titan. The image captures the illuminated side of the rings. The image scale is 4 kilometers (2 miles) per pixel on Epimetheus and 11 kilometers (7 miles) per pixel on Titan.
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Saturn-N00027083.jpgHiding behind the Rings!54 visiteRhea - o almeno così ci sembra, ma potremmo anche sbagliare - "gioca" a nascondersi dietro gli Anelli di Saturno.
Un'immagine incredibile che fissa il momento in cui questa luna si accinge a scomparire dalla visuale della Sonda Cassini, attratta e quindi "assorbita" - si fa per dire... dai maestosi Anelli del Gigante.
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Saturn-PIA06164-br500.jpgSaturn, Titan and Mimas in real colors53 visiteCaption NASA originale:"From its station nearly 1,2 BKMs (or 746 MMs) from Earth, the stalwart Cassini spacecraft sends holiday greetings to Earth with this lovely color portrait of Saturn and two of its moons. This color portrait serves as reminder of the Saturnian places we have already seen and the promise of future discovery at Titan when the European Space Agency's Huygens probe arrives at Titan on Jan. 14, 2005. A grayish, oval-shaped storm is visible in Saturn's southern hemisphere and is easily 475 Km across - the size of some hurricanes on Earth. Titan is visible near lower right with its thick, orange-colored atmosphere, and faint Mimas (398 Km across) appears just right of the rings' outer edge. Images taken in the red, green and blue filters with the Cassini spacecraft wide angle camera on Dec. 14, 2004, were combined to create this color view at a distance of approximately 719.000 Km from Saturn. The image scale is 43 Km (or 27 miles) per pixel".
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Saturn-PIA06604.jpgSaturn, Titan, Rhea and Enceladus55 visiteCaption NASA originale:"Saturn's biggest and brightest moons are visible in this portrait by Cassini.
Titan (5.150 Km, or 3,200 miles across) is Saturn's largest moon and appears at the lower left. Note that some details in the moon's smoggy atmosphere are visible here. Rhea (1.528 Km, or 949 miles across) is the planet's second largest moon and is seen above center. Enceladus (505 Km, or 314 miles across) has the brightest surface in the solar system, reflecting nearly all of the sunlight that falls upon it. Enceladus is just above the rings, left of center. Titan was on the far side of the planet at the time of this exposure, while the other moons were on the near side, much closer to Cassini.
Also seen here are details in the cloud bands of Saturn's mostly hydrogen atmosphere, variations in brightness across the dazzling rings and magnificent ring shadows cast upon the northern hemisphere. The image was taken with the Cassini spacecraft wide-angle camera on Feb. 5, 2005, at a distance of approximately 3.4 million kilometers (2.1 million miles) from Saturn through a filter sensitive to wavelengths of infrared light centered at 728 nanometers. The image scale is 200 kilometers (124 miles) per pixel".
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Saturn-PIA07569.jpgThe Kingdom of Beauty54 visiteAbbiamo da tempo notato che le immagini di Saturno (e/o di Giove) e dei loro Sistemi non sembrano interessare i Lettori. Non è solo il counter che esprime "quante volte" un frame è stato aperto che parla e ci racconta, bensì anche gli altri indici statistici che ci informano su quanti Visitatori sono entrati in ciascuna Sezione o sub-Sezione del Sito. Ebbene, quando verifichiamo questi dati per le sub-Sezioni dedicate a Giove e Saturno, la delusione è grande. Forse la colpa è nostra, ci siamo detti, perchè non riusciamo a rendere 'accattivante' il Regno dei Giganti Gassosi...O forse la colpa, se di colpa si può parlare, è dei media i quali, spesso e volentieri, parlano - anche a vanvera - di Marte e/o della Luna, ma molto raramente (2/3 volte l'anno) accennano a Saturno (e Titano). Giove, ormai, è solo un ricordo.
La verità, secondo noi, è che su Marte i media si sono sbizzarriti così tanto che viene quasi naturale interessarsi solo al Pianeta Rosso...Ma attenti: il Futuro, è ben oltre le sabbie di Cydonia!
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