| Piú viste - Saturn: the "Ringed Beauty" and His Moons |
Enceladus-3D-MF.jpgTiger Stripes (High-Def-3D; credits: Dr M. Faccin)56 visiteDa guardare...MareKromium
|
|
Saturn-PIA11633.jpgShadows...56 visiteCaption NASA:"The shadows of two moons appear on Saturn, above and below the plane of the Planet's Rings.
North on Saturn is up in this image, and the shadow of Dione can be seen south of the Planet's Equator. The smaller shadow of Mimas is north of the Equator.
Dione and Mimas both have orbits that are slightly inclined in relation to the Planet's Equatorial Plane, so, depending upon the orientation of their orbits, their shadows may appear North or South of Saturn's Equator. The moons themselves do not appear in this image.
This view looks toward the Northern, sunlit side of the Rings from about 1° above the Ring-Plane. Scale in the original image was about 100 Km (approx. 62 miles) per pixel. The image has been magnified by a factor of 1.5 and contrast-enhanced to aid visibility.
The image was taken with the Cassini Spacecraft wide-angle camera on Oct. 15, 2009 using a spectral filter sensitive to wavelengths of Near-InfraRed Light centered at 752 nanometers. The view was acquired at a distance of approx. 899.000 Km (about 558.000 miles) from Saturn and at a Sun-Saturn-Spacecraft, or Phase, angle of 65°".MareKromium
|
|
Saturn-PIA12513.jpgCrescent Saturn (Natural Colors; credits: NASA/JPL/Space Science Institute)56 visiteCaption NASA:"Saturn, stately and resplendent in this Natural Color view, dwarfs the icy moon Rhea.
Rhea orbits beyond the Rings on the right of the image. The moon Tethys is not shown here, but its shadow is visible on the Planet on the left of the image. This view looks toward the Northern, sunlit side of the Rings from just above the Ring-Plane.
Images taken using red, green and blue spectral filters were combined to create this Natural Color view. The images were obtained with the Cassini Spacecraft wide-angle camera on Nov. 4, 2009 at a distance of approx. 1,3 MKM (about 808.000 miles) from Saturn.
Image scale is roughly 72 Km (about 45 miles) per pixel".MareKromium
|
|
The_Rings-091227-W00062195-96-98-EB-LXTT.jpgRings on Parade! (possible Natural Colors; credits: Elisabetta Bonora - Lunexit Team)56 visiteMareKromium
|
|
Prometheus-4220346220_c47de906a1_o.jpgPrometheus adrift... (possible True Colors; credits: Dr M. Faccin - Lunexit Team)56 visitenessun commentoMareKromium
|
|
Mimas-PIA12532.jpgLost in the Dark (Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)56 visiteCaption NASA:"Lit terrain seen here is on the Trailing Hemisphere of Mimas. This view looks toward the Northern, sunlit side of the Rings, from just above the Ring-Plane.
The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on Nov. 3, 2009. The view was obtained at a distance of approx. 760.000 Km (about 472.000 miles) from Mimas and at a Sun-Mimas-Spacecraft, or Phase, Angle of 61°.
Image scale is roughly 5 Km (a little more than 3 miles) per pixel. MareKromium
|
|
The_Rings-MF-N00150070_to_N00150100.jpgGlowing in the Darkness... (Image Mosaic - Possible True Colors; credits: Dr M. Faccin - Lunexit Team)56 visitenessun commentoMareKromium
|
|
Aegaeon-EB.gifIn the Aegaeon Sea... (GIF-Movie; creditgs: Elisabetta Bonora - Lunexit Team)56 visiteAegaeon, OR also Saturn LIII (being its provisional designation S/2008-S-1), is one of the very many moons of Saturn.
Its discovery was first announced by Dr Carolyn Porco, of the Cassini Imaging Science Team, on March 3, 2009, from observations taken on August, 15, 2008.
Aegaeon orbits within the bright segment of Saturn's G-Ring, and is likely a major source of the Ring itself. Debris knocked off the moon form a bright Arc near the Inner Edge of the G-Ring, which in turn spreads to form the rest of the Ring.
Aegaeon is "trapped" in the 7:6 co-rotation Eccentricity Resonance with Mimas. Aegaeon, Anthe and Methone therefore form a distinctive class of objects in the Saturn System: small moons in co-rotation Eccentricity Resonances with Mimas associated with (bright) "Arcs of Debris". Comparisons among these different Ring-Arc Systems reveal that Aegaeon’s orbit is closer to the exact Resonance than Anthe’s and Methone’s orbits are.
This could indicate that Aegaeon has undergone significant orbital evolution via its interactions with the other objects in its Arc's Segmet, which would be consistent with the evidence that Aegaeon’s mass is much smaller relative to the total mass in its Arc than Anthe’s and Methone’s masses are.
Assuming that Aegaeon has the same albedo as Pallene, his size is estimated to be about half a kilometer (approx. 500 mt) in diameter.
Aegaeon orbits Saturn at an average distance of about 167.500 Km from the Parent Planet (top of the Saturnian Clouds), in 0,80812 days (a little more than 19 hours), at an inclination of 0,001° to Saturn's Equator (being his Orbital Eccentricty equal to, 0,0002 - remember that the so-named "Mean Eccentricity" of an object is its Average Eccentricity, as resulting of perturbations over a given time period).
It is named after Aegaeon, one of the so-called "Hecatonchires" (Greek or "Centimani", in Latin). The Hecatonchires were 3 giants of incredible strength and ferocity, even superior to that of the Titans whom they helped overthrow.
Their name derives from the Greek words "hekaton" ---> "hundred" and "kheir" ---> "hand", and each one of them had a hundred hands and fifty heads.
Hesiod's Theogony (624, 639, 714, 734–35) reports that the 3 Hecatonchires became the guards of the gates of Tartarus (in Greek Mithology, it is a deep, gloomy place - a pit, or an abyss - used as a dungeon of torment and suffering that resides beneath the underworld).
In other words: an Hell deeper and darker than the "Traditional" Hell...MareKromium
|
|
Mimas_and_the_Rings-PIA12543.jpgIn-Between (Natural Colors; credits: NASA/JPL/Space Science Institute)56 visiteCaption NASA:"Two of Saturn's moons straddle the Planet's Rings in this view. Mimas is closest to the Cassini Spacecraft here. Epimetheus, instead, is on the far side of the Rings.
Saturn's shadow cuts across the middle of the Rings. This view looks toward the sunlit side of the Rings from just above the Ring-Plane.
Images taken using red, green and blue spectral filters were combined to create this Natural Color view. The images were obtained with the Cassini Spacecraft narrow-angle camera on Oct. 24, 2009 at a distance of approx. 2,7 MKM (such as about 1,7 MMs) from Epimetheus and approx. 2,4 MKM (about 1,5 MMs) from Mimas.
Scale on Mimas is roughly 14 Km (a little less than 9 miles) per pixel".MareKromium
|
|
Japetus-PIA12556.jpgPlanet or Planetoid?56 visiteCaption NASA:"The oblate shape of the moon Japetus is particularly noticeable in this portrait.
The two-toned surface of the moon Japetus also stands out against the darkness of space in this image.
This view looks toward the Saturn-facing Side of Japetus. North is up and rotated 26° to the left.
Scale in the original image was about 22 Km (approx. 14 miles) per pixel.
The image was contrast enhanced and magnified by a factor of three to enhance the visibility of surface features.
The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on Dec. 16, 2009. The view was acquired at a distance of approx. 3,6 MKM (about 2,2 MMs) from Japetus and at a Sun-Japetus-Spacecraft, or Phase, Angle of 27°".MareKromium
|
|
Tethys-PIA12588.jpgTethys (Absolute Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)56 visiteCaption NASA:"Odysseus Crater, with a size of epic proportions, stretches across a large Northern Expanse on Saturn's moon Tethys.
This view looks toward the Leading Hemisphere of Tethys. Odysseus Crater is about 450 Km, or approx. 280 miles, across. North on Tethys is up and rotated 3° to the right.
The image was taken in Visible Green Light with the Cassini Spacecraft narrow-angle camera on Feb. 14, 2010. The view was obtained at a distance of approx. 178.000 Km (such as about 111.000 miles) from Tethys and at a Sun-Tethys-Spacecraft, or Phase, Angle of 73°.
Image scale is about 1 Km (3485 feet) per pixel".
MareKromium
|
|
Prometheus.jpgPrometheus56 visitenessun commentoMareKromium
|
|
| 2245 immagini su 188 pagina(e) |
 |
|
|
|
|
150 | |
|
|
|
|
