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Prometheus-PIA11531.jpgPrometheus54 visiteCaption NASA:"The moon Prometheus and a bit of Saturn's Northern Hemisphere are both brilliantly lit by the Sun here, making the A-Ring seem dim in comparison.
The bright limb of Saturn's Northern Hemisphere can be seen through the A-Ring in the lower left of the image.
Prometheus (about 86 Km, or approx. 53 miles across) orbits in the Roche Division between Saturn's A and F-Ring.
For a similar view of Pandora, another of the F-Ring's Shepherding Moons, see PIA09899.
This view looks toward the sunlit side of the Rings, from about 20° below the Ring-Plane.
The image was taken in Red Light with the Cassini Spacecraft narrow-angle camera on May 25, 2009. The view was acquired at a distance of approx. 694,000 Km (about 431.000 miles) from Prometheus and at a Sun-Prometheus-Spacecraft, or Phase, Angle of 49°.
Image scale is roughly 3,6 Km (about 2,2 miles) per pixel".MareKromium
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Dione-PIA11532.jpgWispy Dione54 visiteCaption NASA:"The Cassini Spacecraft looks toward the wispy, fractured terrain of the Trailing Hemisphere of the moon Dione.
To learn more about Dione's "Wisps", see also PIA08960.
Lit Terrain seen here is on the Trailing Hemisphere of Dione (about 1123 Km, or approx. 698 miles across). North on Dione is up and rotated 29° to the right.
The image was taken in visible light with the Cassini Spacecraft narrow-angle camera on May 26, 2009. The view was acquired at a distance of approx. 1,3 MKM (about 808.000 miles) from Dione and at a Sun-Dione-Spacecraft, or Phase, Angle of 35°.
Image scale is roughly 8 Km (about 5 miles) per pixel".MareKromium
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Janus-PIA11534.jpgCraters on Janus (possible Natural Colors; credits: Lunexit)54 visiteCaption NASA:"From hundreds of thousands of kilometers away, the Cassini Spacecraft spies craters on the Surface of the moon Janus.
This view looks toward the Saturn-facing side of Janus (about 179 Km, or approx. 111 miles across). North on Janus is up and rotated 27° to the right. The image was taken in Green Light with the Cassini Spacecraft narrow-angle camera on May 25, 2009.
Scale in the original image was roughly 4 Km (approx. 2,5 miles) per pixel. The image has been magnified by a factor of two and contrast-enhanced to aid visibility.
The view was acquired from a distance of approx. 730.000 Km (such as about 454.000 miles) from Janus and at a Sun-Janus-Spacecraft, or Phase, Angle of 38°".MareKromium
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ZZ-Mercury-Craters-Unnamed_Rayed_Crater-PIA12068.jpgRayed Crater Cluster (possible Natural Colors; credits: Lunar Explorer Italia)54 visiteThis NAC image from MESSENGER’s second Mercury flyby shows a crater with a set of light-colored rays radiating outward from it. Such rays are formed when an impact excavates material from below the surface and throws it outward from the crater.
These bright rays, consisting both of ejecta and the secondary craters that form when the ejected material re-impacts the surface, slowly begin to fade as they are exposed to the harsh space environment.
Mercury and other airless planetary bodies are constantly being bombarded with Micrometeorites and Energetic Ions, an effect known as "Space Weathering".
Craters with bright rays are thought to be relatively young because the rays are still visible, suggesting that they have had less exposure to Weathering processes. The crater in the center of this image has rays that have already begun to fade, implying that it is older than some other rayed craters on Mercury’s surface. Images of younger craters with much brighter and more striking rays have been previously released (see PIA11355).
Date Acquired: October 6, 2008
Image Mission Elapsed Time (MET): 131771863
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 240 meters/pixel (0,15 miles/pixel)
Scale: Image is approximately 240 Km (about 150 miles) wide
Spacecraft Altitude: about 9500 Km (approx. 5900 miles)MareKromium
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ZZ-Mercury-Craters-Lermontov_Crater-PIA12116.jpgLermontov Crater (possible Natural Colors; credits: Lunar Explorer Italia)54 visiteLermontov Crater was first observed by Mariner 10 and seen more recently by MESSENGER during its second flyby of Mercury. The Crater fFloor is somewhat brighter than the exterior surface and is smooth with several irregularly shaped depressions.
Such features, similar to those found on the floor of Praxiteles Crater (see PIA12040), may be evidence of past explosive volcanic activity on the Crater Floor. Lermontov appears reddish in enhanced-color views (see PIA11411), suggesting that it has a different composition from the surrounding surface.
Lermontov is named for Mikhail Yurevich Lermontov, a nineteenth-century Russian poet and painter who died from a gunshot suffered in a duel.
Date Acquired: October 6, 2008
Image Mission Elapsed Time (MET): 131771953
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 250 meters/pixel (0,16 miles/pixel)
Scale: Lermontov’s diameter is about 152 Km (approx. 94 miles)
Spacecraft Altitude: about 10.000 Km (approx. 6200 miles)
Nota Lunexit: curiosamente, dopo il nostro Color Processing, non è Lermontov ad apparire "rossiccio", a fronte di terreni circostanti grigiastri, bensì l'esatto contrario! Curioso...MareKromium
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ZZ-Mercury-Craters-Tiziano_Crater-PIA12079.jpgTitian Crater (extremely enhanced Natural Colors; credits: NASA and Lunar Explorer Italia)54 visiteThis enhanced-color image shows Titian Crater (center) and is similar to an image that recently appeared in the 1st of May 2009 issue of Science magazine.
The enhanced-color view was created by using high-resolution images taken in all 11 WAC filers (one of which is shown in a previously released image, see PIA11765) and comparing and contrasting them to accentuate differences on Mercury’s Surface. Such color differences can be used to learn about the history of Mercury’s Surface in this area. In the enhanced color, the smooth floor of Titian is a brighter orange color than the surrounding area, likely due to being filled with volcanic material. Ejecta from Titian appear blueish and cover much of the Surface surrounding the Crater. This material was excavated from depth during the Crater’s formation.
Later impacts, such as the one that produced the small crater that appears yellowish in the upper center of the image, excavated material from below the Titian ejecta. This yellow-appearing material was present at or near the surface before the impact that created Titian and is a different composition (and thus, color) from its surroundings. Impacts make it possible to assess how Mercury’s Crust varies with depth and ultimately how the crust evolved through time.
Date Acquired: October 6, 2008
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 462 meters/pixel (0,29 miles/pixel)
Scale: Titian crater is about 121 Km (approx. 75 miles) in diameter
Nota Lunexit: curiosa la "chiazza violacea" visibile ad ore 01:00 del Cratere "Tiziano". La NASA, ovviamente, ha commentato tutto, tranne il dettaglio più intrigante. Noi, purtroppo, non possiamo aggiungere nulla, se non ribadire un concetto già espresso dalla NASA più volte, e cioè che "a colore diverso, nei frames colorizzati in natural enhanced colors, corrisponde un materiale diverso". Nulla di più.MareKromium
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Rhea-PIA11537.jpgRhea and two "Possible Companions"54 visiteCaption NASA:"A couple of craters share a crescent of Lit Terrain on Saturn's moon Rhea.
Lit Terrain seen here is on the Trailing Hemisphere of Rhea. This view is centered on 48° North Latitude, 234° West Longitude. The North Pole is on the Terminator, about one-quarter of the way inward from the top of the image.
The image was taken in Visible Violet Light with the Cassini Spacecraft narrow-angle camera on June 3, 2009. The view was obtained at a distance of approx. 1,4 MKM (such as about 870.000 miles) from Rhea and at a Sun-Rhea-Spacecraft, or Phase, Angle of 121°.
Image scale is roughly 8 Km (about 5 miles) per pixel".MareKromium
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SOL089-GB-LXT.jpgRover Tracks - Sol 89 (Natural Colors; credits: Dr G. Barca)54 visitenessun commentoMareKromium
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ZU-PIA12135.jpgGood-bye Mercury!54 visiteThese images were taken by MESSENGER as the spacecraft departed Mercury after completing its 2nd flyby on October 6, 2008. During this sequence, images were taken every 5 minutes.
A portion of the same sequence, totaling 198 images in all, has also been made into a movie (see PIA11412). MESSENGER will make its third and final flyby of Mercury on September 29, 2009, and will become the first Spacecraft ever to orbit Mercury in March 2011.
Date Acquired: October 6, 2008
Image Mission Elapsed Time (MET): 131788060-131840260
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Scale: Mercury’s diameter is 4880 Km (approx. 3030 miles)
Spacecraft Distange from Target: from 95.000 up to 370.000 Km (such as from about 59.000 up to 230.000 miles)MareKromium
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DustDevilTracks-TerraCimmeria-MO-20090722a.jpgDust Devil Tracks in Terra Cimmeria (Natural Colors; credits: Lunar Explorer Italia)54 visiteCoord.: 66,5° South Lat. and 162,3° East Long.MareKromium
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DustDevilTracks-TerraCimmeria-MO-20090723a.jpgDust Devil Tracks in Terra Cimmeria (Natural Colors; credits: Lunexit)54 visiteCoord.: 55,8° South Lat. and 179,5° East Long.MareKromium
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OPP-SOL1879-MI-GB-LXT.jpgBerries - Sol 1879 (Superdefinition and Natural Colors; credits: Dr G. Barca)54 visitenessun commentoMareKromium
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