| Piú votate - Saturn: the "Ringed Beauty" and His Moons |
The_Sun_behind_Saturn-EB.jpgSaturnian Skyline (credits: Elisabetta Bonora - Lunexit Team)58 visitenessun commentoMareKromium
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The_Sun_behind_Saturn-EB.gifSetting Sun, in the Space of Saturn (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)59 visitenessun commentoMareKromium
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Mimas_and_the_Rings-PIA12543.jpgIn-Between (Natural Colors; credits: NASA/JPL/Space Science Institute)60 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
(5 voti)
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Aegaeon-EB.gifIn the Aegaeon Sea... (GIF-Movie; creditgs: Elisabetta Bonora - Lunexit Team)57 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
(5 voti)
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Japetus-MF3.jpgUps and Downs on Japetus (Image-Mosaic; credits: Dr M. Faccin)60 visitenessun commentoMareKromium
(5 voti)
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Dione-PIA12529.jpgCrescent Dione (possible Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)58 visiteCaption NASA:"The tortured Terrain of Saturn's moon Dione is documented in this Cassini Spacecraft image.
The wispy fractures on the moon's Trailing Hemisphere can be seen on the left of the image, and Cratered Terrain on the moon's anti-Saturn side dominates the center of the image. North on Dione is up.
The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on Nov. 23, 2009. The view was acquired at a distance of approx. 896.000 Km (such as about 557.000 miles) from Dione and at a Sun-Dione-Spacecraft, or Phase, Angle of 81°.
Image scale is roughly 5 Km (a little more than 3 miles) per pixel".MareKromium
(5 voti)
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Prometheus-4220346220_c47de906a1_o.jpgPrometheus adrift... (possible True Colors; credits: Dr M. Faccin - Lunexit Team)57 visitenessun commentoMareKromium
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Mimas-PIA11642.jpg"Oblate" Mimas (Possible Natural Colors; credits: Lunexit)58 visiteCaption NASA:"The Cassini Spacecraft reveals the cratered surface of Mimas, a moon whose shape is flattened at the Poles. (see PIA07534 to learn more about why the moon has this oblate shape)
This view looks toward the Trailing Hemisphere of Mimas (approx. 396 Km, or about 246 miles, across). North on Mimas is up and rotated 1° to the left.
The image was taken in Visible Green Light with the Cassini Spacecraft narrow-angle camera on Oct. 14, 2009. The view was acquired at a distance of approx. 273.000 Km (such as about 170.000 miles) from Mimas and at a Sun-Mimas-Spacecraft, or Phase, Angle of 5°.
Image scale is roughly 2 Km (about 1,4 miles) per pixel".MareKromium
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TheRings-PIA11635.jpgAegaeon and the G-Ring59 visiteCaption NASA:"The bright arc within Saturn's G-Ring is shown truncated by the shadow of the Planet at the bottom of this image.
Although it can't be seen here, the tiny moonlet Aegaeon (formerly known as S/2008 S 1) orbits within the bright arc.
This view looks toward the northern, sunlit side of the Rings from about 4° above the Ring-Plane. Many background stars are visible elongated by the motion of the Spacecraft during the image's exposure.
The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on Oct. 9, 2009. The view was obtained at a distance of approx. 2,1 MKM (about 1,3 MMs) from Saturn. Image scale is roughly 12 Km (a little more than 7 miles) per pixel".MareKromium
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Tethys_and_Enceladus-N00144766-N00144785.gifOrbit after Orbit... (GIF-Movie; credits: Dr G. Barca)58 visitenessun commentoMareKromium
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Enceladus-N00143622-N00143643.gifFountains of Light and possible UFO (GIF-Movie; credits: Dr G. Barca)59 visiteDalla (sconfinata) Pazienza del nostro Grande Amico e Partner, Dr Gianluigi Barca, un GIF-Movie davvero bellissimo, affascinante ed intrigante.
Una scatola di cioccolatini (virtuali) al primo Lettore capace di identificare l'oggetto che sfreccia davanti alle telecamere di CASSINI mentre la "Palla di Neve" - Enceladus - continua ad eiettare ghiaccio nello Spazio circum-Saturniano!MareKromium
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Tethys-N00143887-N00143908.gifSpace Speedway (GIF-Movie; credits: Dr G. Barca)55 visitenessun commentoMareKromium
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