| Piú viste - Saturn: the "Ringed Beauty" and His Moons |
Pandora-N00042203.jpgPandora and...?56 visiteOriginal caption:"N00042203.jpg was taken on October 29, 2005 and received on Earth October 30, 2005. The camera was pointing toward PANDORA at approximately 459.147 Km away, and the image was taken using the CL1 and UV3 filters. This image has not been validated or calibrated".
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Helene-N00042585.jpgHelene and Enceladus56 visiteOriginal caption:"N00042585.jpg was taken on November 02, 2005 and received on Earth November 04, 2005. The camera was pointing toward HELENE at approximately 2.186.673 Km away, and the image was taken using the CL1 and CL2 filters.
This image has not been validated or calibrated".
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Japetus-N00042704.jpgJapetus: very bright, maybe too bright...56 visiteOriginal caption:"N00042704.jpg was taken on November 03, 2005 and received on Earth November 05, 2005. The camera was pointing toward IAPETUS at approximately 1.617.693 Km away and the image was taken using the CL1 and CL2 filters".
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Dione&Co.-PIA07628.jpgDione, Tethys and Pandora56 visiteOriginal caption:"This excellent grouping of 3 moons - Dione, Tethys and Pandora - near the Rings, provides a sampling of the diversity of worlds that exists in Saturn's Realm. A 330-Km-wide (about 205 miles) impact basin can be seen near the bottom right on Dione (at left). Ithaca Chasma and the Region imaged during the Cassini spacecraft¿s Sept. 24, 2005, flyby can be seen on Tethys (middle). Little Pandora makes a good showing here as well, displaying a hint of surface detail. Tethys is on the far side of the Rings in this view; Dione and Pandora are much nearer to the Cassini spacecraft.
Rememeber that Dione is approx. 1.126 Km (about 700 miles) across. Tethys is approx. 1.071 Km (about 665 miles) across and Pandora is 84 Km (roughly 52 miles) across.
This image was taken in visible blue light with the Cassini spacecraft narrow-angle camera on Sept. 22, 2005, at a distance of approx. 1,2 MKM (about 800.000 miles) from Saturn. The image scale is about 5 Km (approx. 3 miles) per pixel on Dione and Pandora and 9 kilometers (6 miles) per pixel on Tethys".
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Calypso-PIA07633.jpgCalypso (in false colors)56 visiteThis color image provides the best look yet at Saturn's moon Calypso, a Trojan of the larger moon Tethys. Calypso trails Tethys in its orbit by 60°. Telesto is the other Tethys Trojan, orbiting Saturn 60°ahead of Tethys. Calypso is only 22 Km (about 14 miles) across. Calypso, like many other small Saturnian moons and small asteroids, is irregularly shaped by overlapping large craters. Although the resolution here is not as high as in Cassini's best images of Pandora and Telesto, this moon appears to also have loose surface material capable of smoothing the appearance of craters. (...) The images were taken with the Cassini spacecraft narrow-angle camera on Sept. 23, 2005, at a distance of approx. 101.000 Km (about 63.000 mi) from Calypso and at a phase angle of 61°. Resolution in the original image was 602 mt per pixel (...) ".
Nota: notiamo un'incredibile somiglianza fra Calypso e l'asteroide 433-Eros. Coincidenza, o c'è una sorta di "marchio di fabbrica" che unisce le piccole lune agli asteroidi?
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Mimas-PIA07639.jpgThe "Eye" of Mimas: Herschel Crater in the Sun-light56 visiteImpact-battered Mimas steps in front of Saturn's Rings, showing off its giant 130-Km (about 80-mile) wide Herschel Crater.
The illuminated terrain seen here is on the moon's Leading Hemisphere. North on Mimas is up and rotated 20° to the left.
The image was taken in visible green light with the Cassini narrow-angle camera on Oct. 13, 2005 at a distance of approx. 711.000 Km (roughly 442.000 miles) from Mimas and at a phase angle of 112°.
The image approx. scale is 4 Km (about 3 miles) per pixel.
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Rhea-N00043262~0.jpgApproaching Rhea (1)56 visiteN00043262.jpg was taken on November 26, 2005 and received on Earth on the same date. The camera was pointing toward Rhea from a distance of about 291.020 Km. The image was taken using the UV2 and CL2 filters.
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Rhea-N00043271.jpgApproaching Rhea (2)56 visiteIn the outpost of the Saturn System the moon Rhea waits for the Cassini spacecraft. On Saturday, Nov. 26, 2005, the spacecraft will come within 500 Km (about 310 miles) of its surface. Rhea's cratered surface looks in some ways similar to our own Moon, or the planet Mercury. But make no mistake: Rhea's icy exterior would quickly melt if this moon were brought as close to the Sun as Mercury.
N00043271.jpg was taken on November 26, 2005, and received on Earth on November 27, 2005. The camera was pointing toward Rhea that, at the time, was distant approximately 172.530 Km from the spaceship. The image was taken using the UV1 and CL2 filters.
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Rhea-N00043273.jpgApproaching Rhea (3)56 visiteSpettacolare la nitidezza di alcuni rilievi posti lungo il Terminatore; da notare una sostanziale mancanza di photographic artifacts i quali invece - di regola - caratterizzano questo tipo di immagini. Lo streak di luce che si vede alla Sx di Rhea (circa ore 10 del frame) potrebbe essere un raggio cosmico.
"...Rhea is the largest airless satellite in the Saturnian System. It is an icy body with a low density, which indicates that it is composed of a rocky core taking up less than 1/3rd of the moon's mass, with the rest composed of water-ice. Rhea is somewhat similar to Dione: they both have similar composition, albedo features, varied terrain and synchronous rotations. Rhea is heavily cratered with bright wispy markings. Its surface can be divided into 2 geologically different areas based on crater density. The 1st area contains craters that are larger than 40 Km in diameter while the 2nd area, spanning over parts of the Polar and Equatorial Regions, has craters under 40 Km in diameter and this suggests that a major resurfacing event occurred some time during its formation.
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Enceladus-N00043439.jpgThe Sun behind Enceladus56 visiteN00043439.jpg was taken on November 27, 2005 and received on Earth November 28, 2005. The camera was pointing toward Enceladus that, at the time, was approximately 149.146 Km away.
The image was taken using the CL1 and CL2 filters.
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Rhea-N00043423.jpgAncient Cliffs and Craters56 visiteN00043423.jpg was taken on November 26, 2005 and received on Earth November 28, 2005. The camera was pointing toward Rhea that, at the time, was approximately 57,975 Km away.
The image was taken using the CL1 and CL2 filters.
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Rhea-N00043407.jpgFeatures on the Terminator56 visiteN00043407.jpg was taken on November 26, 2005 and received on Earth November 27, 2005. The camera was pointing toward Rhea that, at the time, was approximately 62.859 Km away.
The image was taken using the CL1 and CL2 filters.
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