| Ultimi arrivi - Saturn: the "Ringed Beauty" and His Moons |
Dione-N00119786.jpgCross-Worlds! (2)97 visitenessun commentoMareKromiumSet 14, 2008
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Dione-N00119787.jpgCross-Worlds! (3)57 visitenessun commentoMareKromiumSet 14, 2008
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Dione-N00119788.jpgCross-Worlds! (4)60 visitenessun commentoMareKromiumSet 14, 2008
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Dione-N00119789.jpgCross-Worlds! (5)57 visitenessun commentoMareKromiumSet 14, 2008
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Mimas-PIA10467.jpgHol(e)y Mimas! (natural colors; credits: Lunexit)62 visiteCaption NASA:"The sun's low angle near the Terminator throws the craters of Mimas into stark relief.
This view looks toward high Northern Latitudes on Mimas (approx. 396 Km, or about 246 miles across) from a position 72° North of the moon's Equator. The North Pole is in darkness at center.
The image was taken in visible green light with the Cassini Spacecraft narrow-angle camera on Aug. 4, 2008. The view was obtained at a distance of approx. 153.000 Km (such as about 95.000 miles) from Mimas and at a Phase Angle of 106°.
Image scale is 918 meters (3011 feet) per pixel".MareKromiumSet 13, 2008
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Prometheus-PIA08916~0.jpgOrb-at-Work! (natural colors; credits: Lunexit)67 visiteCaption NASA:"Prometheus draws material from the F-Ring along an invisible thread of gravity. Near lower left is an identical feature the moon created on a previous pass near the Ring.
Prometheus (approx. 102 Km, or about 63 miles across) is overexposed in this image, which was taken as part of a sequence designed to help refine scientists' understanding of the orbits of Saturn's small moons. This view looks toward the unlit side of the Rings from about 41° above the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on March 14, 2007 at a distance of approx. 1,8 MKM (such as about 1,1 MMs) from Prometheus.
Image scale is roughly 11 Km (about 7 miles) per pixel". MareKromiumSet 10, 2008
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Prometheus-PIA08947~0.jpgCosmic "Through-and-Through"!61 visiteCaption NASA:"Prometheus pulls away from an encounter with Saturn's F-Ring, leaving behind a reminder of its passage.
Prometheus (about 102 Km, or 63 miles across) approaches closely to the F-Ring once during each circuit around Saturn, disturbing the orbits of the small particles in the Ring and creating a streamer of material that then shears out, following the moon as it speeds off.
This view looks toward the unilluminated side of the Rings from about 37° above the Ring-Plane. Prometheus is brightly lit by the Sun on one side and lit more modestly by Saturn's reflected light on the other side.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 18, 2007 at a distance of approx. 2 MKM (about 1,2 MMs) from Prometheus and at a Sun-Prometheus-spacecraft, or phase angle of 87°. Image scale is roughly 12 Km (about 7 miles) per pixel".
MareKromiumSet 10, 2008
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Rhea-PIA10464.jpgSouthern View of Rhea59 visiteCaption NASA:"Rhea's bright ray crater features prominently in this southern view. The feature is surrounded by bright ejecta — material thrown outward by the impact that formed the crater.
The view looks toward High Southern Latitudes on Rhea from a perspective 49 degrees below the icy moon's Equator. Rhea's South Pole is at bottom center.
The image was taken in visible green light with the Cassini Spacecraft narrow-angle camera on July 29, 2008. The view was acquired at a distance of approx. 413,000 Km (such as about 257.000 miles) from Rhea and at a Sun-Rhea-Spacecraft, or Phase, Angle of 44°.
Image scale is roughly 2 Km (a little more than 1 mile) per pixel".MareKromiumSet 10, 2008
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Anthe_Methone-PIA11102.jpgSmall - but VERY bright - Companions: Anthe and Methone58 visiteCaption NASA:"Recent Cassini images show Arcs of Material co-orbiting with the Saturnian moons Anthe and Methone.
Arrows indicate the positions of Anthe, at top left, and Methone, at bottom right. Micrometeoroid impacts on the moons are the likely source of the Arc Material.
Cassini imaging scientists believe the process that maintains the Anthe and Methone arcs is similar to that which maintains the Arc in the G-Ring (see PIA08327). The general brightness of the image (along with the faint horizontal banding pattern) results from the long exposure time of 15" required to capture the extremely faint ring arc and the processing needed to enhance its visibility (which also enhances the digital background noise in the image).
The image was digitally processed to remove most of the background noise. This view looks toward the un-illuminated side of the Rings from about 2° above the Ring-Plane.
The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on Oct. 29, 2007. The view was acquired at a distance of approx. 2,3 MKM (about 1,4 MMs) from Anthe and 2,2 MKM (approx. 1,4 MMs) from Methone.
Image scale is roughly 14 Km (about 9 miles) per pixel on Anthe and 13 Km (approx. 8 miles) on Methone".MareKromiumSet 08, 2008
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Anthe-PIA11100.jpgThe "Anthe Arc"69 visiteCaption NASA:"Caption NASA:"Cassini images reveal the existence of a faint "Arc of material" orbiting with Saturn's small moon Anthe.
The moon is moving downward and to the right in this perspective. In this image, most of the visible material in the Arc lies ahead of Anthe (2 Km, or a little more than 1 mile across) in its orbit. However, over time the moon drifts slowly back and forth with respect to the Arc.
The Arc extends over about 20° in Longitude (about 5,5% of Anthe's orbit) and appears to be associated with a gravitational resonance caused by the moon Mimas). Micrometeoroid impacts on Anthe are the likely source of the Arc material.
The orbit of Anthe lies between the larger moons Mimas and Enceladus. Anthe shares this region with two other small moons, Pallene (4 Km, or about 3 miles across) and Methone (3 Km, or approx. 2 miles across).
Methone also possesses an Arc (see PIA11102), while Pallene is known to orbit within a faint, complete ring of its own (see PIA08328).
Cassini imaging scientists believe the process that maintains the Anthe and Methone Arcs is similar to that which maintains the Arc in the G-Ring (see PIA08327). The general brightness of the image (along with the faint horizontal banding pattern) results from the long exposure time of 32" required to capture the extremely faint ring arc and the processing needed to enhance its visibility (which also enhances the digital background noise in the image). The image was digitally processed to remove most of the background noise. The long exposure also produced star trails in the background.
The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on April 4, 2008. The view was acquired at a distance of approx. 1,2 MKM (such as about 746.000 miles) from Anthe and at a Sun-Anthe-Spacecraft Angle of 23°. Image scale is roughly 7 Km (about 4 miles) per pixel".MareKromiumSet 08, 2008
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Anthe-PIA11101.jpgThe "Anthe Arc"57 visiteCaption NASA:"Cassini images reveal the existence of a faint "Arc of material" orbiting with Saturn's small moon Anthe.
The moon is moving downward and to the right in this perspective. In this image, most of the visible material in the Arc lies ahead of Anthe (2 Km, or a little more than 1 mile across) in its orbit. However, over time the moon drifts slowly back and forth with respect to the Arc.
The Arc extends over about 20° in Longitude (about 5,5% of Anthe's orbit) and appears to be associated with a gravitational resonance caused by the moon Mimas). Micrometeoroid impacts on Anthe are the likely source of the Arc material.
The orbit of Anthe lies between the larger moons Mimas and Enceladus. Anthe shares this region with two other small moons, Pallene (4 Km, or about 3 miles across) and Methone (3 Km, or approx. 2 miles across).
Methone also possesses an Arc (see PIA11102), while Pallene is known to orbit within a faint, complete ring of its own (see PIA08328).
Cassini imaging scientists believe the process that maintains the Anthe and Methone Arcs is similar to that which maintains the Arc in the G-Ring (see PIA08327). The general brightness of the image (along with the faint horizontal banding pattern) results from the long exposure time of 32" required to capture the extremely faint ring arc and the processing needed to enhance its visibility (which also enhances the digital background noise in the image). The image was digitally processed to remove most of the background noise. The long exposure also produced star trails in the background.
This view looks toward the un-illuminated side of the Rings from about 3° above the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on July 3, 2008. The view was obtained at a distance of approx. 1,2 MKM (such as about 739.000 miles) from Anthe and at a Sun-Anthe-Spacecraft, or Phase, Angle of 12°. Image scale is roughly 7 Km (about 4 miles) per pixel".MareKromiumSet 08, 2008
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Tethys-PIA10462.jpgTethys, in full light (natural colors; credits: Lunexit)59 visiteCaption NASA:"Five hours after acquiring PIA10460, the Cassini Spacecraft turned its cameras back to Tethys for a more southerly view. The southern reaches of Ithaca Chasma are seen here, along with the large crater Telemus, just right of center.
Lit terrain seen here is on the Saturn-Facing Side of Tethys (approx. 1062 Km, or 660 miles across).
This view looks toward the Southern Hemisphere from a perspective 43° South of the moon's Equator. North is toward the top and rotated 30° to the right.
The image was taken in visible green light with the Cassini Spacecraft narrow-angle camera on July 28, 2008. The view was obtained at a distance of approx. 313.000 Km (such as about 194.000 miles) from Tethys and at a Sun-Tethys-Spacecraft, or Phase, Angle of 42°.
Image scale is roughly 2 Km (a little more than 1 mile) per pixel".MareKromiumSet 05, 2008
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