| Piú votate - Saturn: the "Ringed Beauty" and His Moons |
Dione-PIA07627.jpgDione and the F-Ring (in natural colors)56 visiteOriginal caption:"Saturn's moon Dione is about to swing around the edge of the thin F-Ring in this color view. More than one thin strand of the F-Ring's tight spiral can be seen here.
The terrain seen on Dione is on the moon's Saturn-facing hemisphere.
Images taken using infrared, green and ultraviolet spectral filters were composited to create this color view. The images were taken with the Cassini spacecraft narrow-angle camera on Sept. 20, 2005, at a distance of approx. 2 MKM (about 1,2 MMs) from Dione and at a phase angle of 48°.
The image scale is of about 12 Km (such as roughly 7 miles) per pixel".
(4 voti)
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Japetus-N00042610.jpgJapetus, in the darkness...56 visiteOriginal caption:"N00042610.jpg was taken on November 04, 2005 and received on Earth November 05, 2005. The camera was pointing toward IAPETUS at approximately 1.433.927 Km away, and the image was taken using the CL1 and IR1 filters".
Note: un'immagine "inquietante" di Giapeto il quale, già in sè misterioso a causa della sua superficie - in parte - completamente nera, adesso ci appare anche curiosamente "schiacciato" ai poli. Si tratta, probabilmente, di un semplice effetto ottico sulla cui causa, tuttavia, non sapremmo che cosa dire. Bizzarra la configurazione assunta - in questo frame - dal picco centrale del grande cratere (l'Occhio di Giapeto) che domina il Polo Nord apparente di questo incredibile Corpo Celeste.
Inoltre, portando il frame sino al full-size, riuscirete a vedere tanti altri dettagli interessanti della superficie di Giapeto: un mondo - secondo noi - assolutamente affascinante ma ancora poco (almeno apparentemente...) considerato.
(4 voti)
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Tethys-PIA07623.jpgTethys and Dione56 visiteOriginal caption:"Saturn's expansive Rings separate the moon's Tethys (at the top) from Dione (at the bottom). Even in this distant view, it is easy to see that the moons' surfaces, and likely their evolutionary paths, are very different.
Both moons are on the far side of the Rings in this scene, which shows their Saturn-facing Hemispheres (terrain centered on 0° Long.). The dark shadow across the rings is cast by Saturn's Southern Hemisphere.
Note that the diameter of Tethys is about 1.071 Km while the diameter of Dione is approx. 1.126 Km.
This image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 12, 2005, at a distance of approx. 2,4 MKM (such as about 1,5 MMs) from Saturn. The image scale is about 17 Km (about 11 miles) per pixel on the two moons".
(4 voti)
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Tethys and Dione-PIA07621.jpgTethys and Dione59 visiteOriginal caption:"This image shows Tethys partially occulting Dione. For comparison purposes, we remind you that the diameter of Tethys is 1.071 Km (about 665 miles), while Dione is 1.126 Km (such as about 700 miles) across; the difference in the surface brightness of the two moons is immediately apparent.
This still image was acquired on Sept. 16, 2005, at a distance of 2,1 MKM (such as about 1,3 MMs) from Dione and 2,7 MKM (about 1,7 MMs) from Tethys. Resolution in the original images was 13 Km (approx. 8 miles) per pixel on Dione and 16 Km (approx. 10 miles) per pixel on Tethys.
The image was magnified by a factor of two to aid visibility of surface features".
(4 voti)
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The Rings-PIA07616.jpgThe "Cassini" Division (close-up)80 visiteOriginal caption:"The outer reaches of Saturn's Cassini Division merges with the inner A-Ring (at the right) in a Region that is rich in structure.
The smooth Region leading up to the A-Ring grows brighter from the left to the right (known as a "ramp" to Ring).
This Region contains a faint "double-wave" structure that is a density feature caused by the influence of the co-orbital moons Janus and Epimetheus. Scientists are interested in observing the evolution of this density wave as the moons swap places in their orbits every few years, presumably resulting in a change in the perturbations that cause this feature.
This image was taken in visible light with the Cassini narrow-angle camera on Sept. 5, 2005, at a distance of approx. 441.000 Km (about 274.000 miles) from Saturn. The image scale is 2 Km (a little more than 1 mile) per pixel".
(4 voti)
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The Rings-PIA07613.jpgThe C-Ring57 visiteOriginal caption:"The Cassini spacecraft looks close at Saturn to frame a view encompassing the entire C-Ring. In the dark region closer to the planet lies the much dimmer D-Ring. The bright B-Ring wraps around the left side of the scene, while Saturn's shadow darkens the Rings at bottom. For reference, Saturn’s Ring sequence from its surface outwards is "D", "C", "B", "A", "F", "G" then "E".
The image was taken in visible light with the Cassini spacecraft wide-angle camera on Sept. 4, 2005, at a distance of approx. 627.000 Km (390.000 miles) from Saturn. The image scale is 34 Km (about 21 miles) per pixel".
(4 voti)
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Dione-PIA07745-4.jpgDione's horizon - HD (4)60 visitenessun commento
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Dione-PIA07745-3.jpgDione's horizon - HD (3)83 visitenessun commento
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Dione-PIA07745-2.jpgDione's horizon - HD (2)83 visitenessun commento
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Tethys-N00041433.jpgCrescent Tethys57 visiteN00041433.jpg was taken on October 13, 2005 and received on Earth October 14, 2005. The camera was pointing toward TETHYS - distant approximately 644.161 Km away - and the image was taken using the P0 and GRN filters. This image has not been validated or calibrated.
(4 voti)
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Tethys-PIA07607.jpgTethys and the Rings54 visiteOriginal caption:"The dramatic Ithaca Chasma carves an enormous gash for more than 1000 Km (about 620 miles) across Saturn's moon Tethys. Stretching across the top of this view are the B and A-Rings, separated by the Cassini Division. Ithaca Chasma is on the moon's Saturn-facing Hemisphere. North on Tethys is up and rotated 15° to the left in this view.
This image was taken in visible light with the Cassini spacecraft narrow-angle camera on Aug. 24, 2005, at a distance of approx. 2,2 MKM (such as about 1,3 MMs) from Tethys and at a Sun-Tethys-spacecraft angle of 87°. The image scale is 13 Km (about 8 miles) per pixel".
(4 voti)
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Dione-N00041245.jpgDione's Fly-By (17): from about 1.360 Km57 visitenessun commento
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