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Saturn: the "Ringed Beauty" and His Moons
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Telesto-N00047273.jpgTelesto54 visiteOriginal caption:"N00047273.jpg was taken on December 25, 2005 and received on Earth December 26, 2005. The camera was pointing toward TELESTO that, at the time, was approximately 21.404 kilometers away, and the image was taken using the CL1 and CL2 filters".
Nota: secondo Voi è il movimento della Sonda rispetto a Cassini che ha determinato il repentino cambio di posizione di Telesto in questi due frames, oppure Telesto è un'altra - vera, questa volta! - "Tumbling Moon" (al pari - presunto - di Hyperion)?!?
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Telesto-PIA07586.jpgTelesto65 visiteCaption originale:"The blob of light seen here is Saturn's moon Telesto, which shares its orbital path with much larger Tethys. Telesto is 24 Km across.
Although this view may hint at a flattened, potato-like shape for Telesto (a common shape for Saturn's smaller moons), no features on the moon's surface can be resolved here.
The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on Aug. 1, 2005, at a distance of approximately 768.000 Km from Telesto and at a Sun-Telesto-spacecraft angle of 37°. Resolution in the original image was 5 Km per pixel. The image has been contrast-enhanced and magnified by a factor of 4 to aid visibility".
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Telesto-PIA07696-PCF-LXTT-IPF.jpgTelesto (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia/Italian Planetary Foundation) 78 visiteThis view - obtained by the NASA - CASSINI Spacecraft - shows us a few interesting Surface Features (mostly old Impact Craters and Mountains) as well as fine color variations that are found on the Trojan Saturnian moon Telesto. The smooth Surface of this moon suggests that, like Pandora, even Telesto is covered by a mantle of fine, dust-sized Icy Material. The origin of the color differences is not yet understood, but it may reasonably be caused by extremely subtle variations in the Mineralogical Composition of its Surface, or by the (extremely small) size of the Dusty Grains which make up the Icy Soil. Tiny Telesto is a Celestial Body that is approx. 24 Km (such as about 15 miles) wide only.
The image was acquired with the NASA - Cassini Spacecraft Narrow-Angle Camera on December, 25th, 2005 at a distance of approximately 20.000 Km (such as about 12.000 miles) from Telesto and at a Sun-Telesto-CASSINI Spacecraft, or Phase, Angle of 58°. Image scale is 118 meters (387 feet) per pixel.
This picture (which is an Original NASA - CASSINI Spacecraft b/w frame published on the NASA - Planetary Photojournal with the ID n. PIA 07696) has been additionally processed and then colorized, according to an informed speculation carried out by Dr Paolo C. Fienga (LXXT/IPF), 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, Telesto), 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 other things, the existence of different Elements (Minerals) present on the Surface of Telesto, each having a different Albedo (---> Reflectivity) and Chemical Composition.MareKromium
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Telesto-PIA07696.jpgTelesto54 visiteThese views show surface features and color variation on the Trojan moon Telesto. The smooth surface of this moon suggests that, like Pandora, it is covered with a mantle of fine, dust-sized icy material.
This monochrome image was taken in visible light. To create the false-color view (see PIA07697), ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences.
The "color map" was then superposed over a clear-filter image. The origin of the color differences is not yet understood, but may be caused by subtle differences in the surface composition or the sizes of grains making up the icy soil.
Tiny Telesto is a mere 24 Km (about 15 miles) wide.
The image was acquired with the Cassini spacecraft narrow-angle camera on Dec. 25, 2005 at a distance of approx. 20.000 Km (about 12.000 miles) from Telesto and at a Sun-Telesto-spacecraft, or phase, angle of 58°. Image scale is 118 meters (387 feet) per pixel.
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Telesto-PIA07702-PCF-LXTT-IPF.jpgTiny Telesto (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)72 visiteThe NASA - Cassini Spacecraft passed within a cosmic "stone's throw" (---> meaning very close, in cosmic terms) from the Saturnian moon Telesto in October of the AD 2005, capturing this shot of this tiny Trojan moon. Telesto (which is approx. 24 Km, such as a little less than 15 miles across) appears to be mantled in fine, Icy (and/or "Dusty") Material, although a few shallow Impact Craters and some Rocky Outcrops (and/or large Boulders) are visible. Its smooth Surface does not appear to retain the record of intense cratering that most of Saturn's other moons possess.
The original image was taken in Polarized Green Light with the NASA - Cassini Spacecraft Narrow-Angle Camera on October 11, 2005, at a distance of approximately 14.500 Km (such as a little more than 9004 miles) from Telesto. The image scale is roughly 86 meters (283 feet) per pixel.
This picture (which is an Original NASA - CASSINI Spacecraft b/w frame published on the NASA - Planetary Photojournal with the ID n. PIA 07702) has been additionally processed and then colorized, according to an educated guess carried out by Dr Paolo C. Fienga (LXXT/IPF), 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, Telesto), 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 other things, the existence of different Elements (Minerals) present on the Surface of Telesto, each having a different Albedo (---> Reflectivity) and Chemical Composition.MareKromium
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Telesto-PIA07702.jpgTelesto55 visiteThe Cassini spacecraft passed within a cosmic stone's throw of Telesto in October, 2005 capturing this shot of the tiny Trojan moon. Telesto (24 Km, or 15 miles across) appears to be mantled in fine, icy material, although a few craters and some outcrops and/or large boulders are visible. Its smooth surface does not appear to retain the record of intense cratering that most of Saturn's other moons possess.
The image was taken in polarized green light with the Cassini spacecraft narrow-angle camera on Oct. 11, 2005, at a distance of approx. 14.500 Km (9.000 miles) from Telesto. The image scale is 86 mt (about 283 feet) per pixel.
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Telesto.jpgTelesto53 visiteCaption NASA originale:"Saturn's moon Telesto is visible below and to the left of center in this image from the Cassini spacecraft.
Telesto (only 24 Km across) shares the orbit of Saturn's moon Tethys (1.071 Km across), leading the larger moon in its path by 60°. Similarly sized Calypso (22 Km across) trails Tethys by the same amount. These positions, called Lagrange points, are dynamically stable. In being co-orbital moons of Tethys, Telesto and Calypso are like the Trojan moons of Jupiter, which occupy Lagrange points and orbit 60° ahead and behind of Jupiter. The Saturnian moon Dione also has companion moons: Helene, which leads Dione in its orbit and the Cassini-discovered trailing Lagrange moon, Polydeuces. This image was taken in visible light with the Cassini spacecraft narrow angle camera on Jan. 18, 2005, at a distance of approximately 3,7 MKM from Telesto. Resolution in the image is 7 Km per pixel. Telesto has been brightened by a factor of two to aid visibility".
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Telesto~0.jpgThe Trojan Moons: Telesto, from 533.000 Km53 visiteCaption NASA originale:"This is Cassini's best look yet at the Trojan moon Telesto (24 Km, or 15 miles across), which orbits Saturn about 60° ahead of the much larger Tethys (1.071 Km, or 665 miles across). Calypso (22 Km, or 14 miles across) is the other Tethys Trojan and trails the larger moon by 60°. Trojan moons are found near gravitationally stable points ahead or behind a larger moon.
Cassini is able to partly resolve Telesto's shape in this view, but surface features are too small to be visible from this distance.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 20, 2005, at a distance of approx. 533.000 Km (331.000 miles) from Telesto. The image scale is 3 Km (about 2 miles) per pixel. This view of Telesto has been magnified by a factor of three and sharpened to aid visibility".
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Tethis from Voyager 2.jpgTethis from Voyager 257 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
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Tethys - N00023703.jpgTethys, from approx. 250.000 Km53 visitenessun commento
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Tethys and Dione-N00029831.jpgTethys and Dione53 visiteUno dei tanti "incroci" fra le lune di Saturno, al quale la Sonda Cassini ha avuto l'onore di assistere da una distanza - per così dire... - ragionevole: in fondo, fra Cassini e Tethys, ci sono solo un milione e mezzo di km...
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Tethys and Dione-PIA07621.jpgTethys and Dione53 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".
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