| Piú viste - Mars Reconnaissance Orbiter (MRO) |
ESP_019151_1385_RED_abrowse-00.jpgUnnamed Shallow Craters in Northern Argyre Planitia (CTX Frame - Absolute Natural Colors; credits for the additional process. and color.: Dr Marco Faccin - Lunexit Team)95 visitenessun commentoMareKromium
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PSP_003972_1305_RED_browse-PCF-LXTT.jpgProposed MSL Landing Site in an Unnamed Southern Crater (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 95 visitenessun commentoMareKromium
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PSP_010862_1880_RED_abrowse-00-PCF-LXTT.jpgRecent Impact in Amazonis Planitia (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)95 visitenessun commentoMareKromium
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PSP_010877_1610_RED_abrowse-PCF-LXTT.jpgCentral Uplift (Absolute Natural Colors; additional process.: Dr Paolo C. Fienga - Lunexit Team)95 visitenessun commentoMareKromium
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ESP_020940_1315_RED_abrowse-PCF-LXTT.jpgUnnamed Southern Crater with Gullies and Dark Dunes (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)95 visitenessun commentoMareKromium
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Craters-Unnamed_Crater-Arabia_Terra-1.jpgMartian "Love" (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)95 visiteis picture of a "heart-shaped" feature in Arabia Terra on Mars was taken on May 23, 2010, by the Context Camera (CTX) on NASA's Mars Reconnaissance Orbiter. A small Impact Crater near the tip of the heart is responsible for the formation of the bright, heart-shaped feature. When the impact occurred, darker material on the Surface was blown away while brighter material beneath it was revealed.
Some of this brighter material appears to have flowed further downslope to form the heart, as the small impact occurred on the Ejecta Blanket of a much larger Impact Crater.
The heart-shaped feature is about 1 Km (0,6 mile) long and is centered at 21,9° North Lat. and 12,7° West Long.
These pictures are subframes of the full CTX image B21_017910_2002_XI_20N012W, taken just at the start of Northern Summer on Mars. North is to the right, and illumination is from the upper right.MareKromium
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Psp_009698_1705_red.jpgNoctis Labyrinthus Region (possible True Colors; credits: Lunar Explorer Italia)94 visiteMars Local Time: 15:26 (early afternoon)
Coord. (centered): 9,3° South Lat. and 266,9° East Long.
Spacecraft altitude: 268,1 Km (such as about 167,5 miles)
Original image scale range: 26,8 cm/pixel (with 1 x 1 binning) so objects ~80 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 19,2°
Phase Angle: 75,1°
Solar Incidence Angle: 60° (meaning that the Sun is about 30° above the Local Horizon)
Solar Longitude: 115,7° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_013348_1185_RED_abrowse-01.jpgDunefield in Noachis Terra (EDM - Natural Colors; credits: Lunar Explorer Italia)94 visitenessun commentoMareKromium
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ESP_019213_2210_RED_abrowse.jpgPossible Alpine-like Glacier (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)94 visitenessun commentoMareKromium
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ESP_019186_1955_RED_abrowse-PCF-LXTT.jpgTrough in Syris Major (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)94 visitenessun commentoMareKromium
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ESP_019482_2135_RED_abrowse-03.jpgEverything fades... (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)94 visiteThis young impact site was discovered by the MRO CTX Science Team. A new "Dark Spot" appeared in a CTX image from July 2008 that was not seen when the region was previously imaged by the Mars Odyssey THEMIS VIS instrument in November 2004. High resolution imaging by HiRISE in November 2008 (left panel of the inset) confirmed that the Dark Spot was Ejecta from a Cluster of Craters.
Three large craters ranging from about 3 to 5 meters diameter and at least 5 smaller craters make up the Cluster. A smaller outlier (approximately 2 meters in diameter, not pictured in the inset) landed 300 meters away to the North/West. These craters were likely produced by a single Impactor that broke into pieces as it fell through the Martian Atmosphere.
The Impactor probably approached from the North/West, judging from the shape of the Ejecta Pattern and the location of the small outlier.
The impacts sprayed the site with Dark Ejecta excavated from beneath the bright Surface. The conspicuous, newly formed feature, will now provide an ideal location to monitor the effects of Winds on the (relatively) modern Martian Surface.
HiRISE imaged the site again in September 2010, after the passage of a full Martian year, when the illumination was similar to the previous HiRISE image. By luck, the SIA (Solar Incidence Angle, such as the Zenith Angle of the Sun) of the later image was only 0,2° different from that of the earlier image.
However, the Phase Angle (such as the angle between the Sun, the Target, and the Spacecraft Camera) was smaller by about 14° as the Spacecraft rolled in the opposite direction.
The new picture shows the Ejecta Pattern apparently faded in comparison to the previous image. The contrast of other features in the scene (such as the Hills and Boulders) is similar, but the Ejecta from the Crater Cluster are noticeably brighter in the HiRISE image from 2010. One possibility is that the Dark Ejecta reflects Sunlight differently than the bright surrounding Terrain - becoming darker more rapidly as Phase Angle increases.
Another possibility is that the Ejecta Pattern was mantled by a thin Layer of bright Dust that settled out of the Atmosphere during the 20 month interval between the two images.
Further monitoring of this site by HiRISE will help choose between these hypotheses.
This target illustrates how the various instruments on MRO work together. The spatial coverage of HiRISE is too limited to search for new impact craters across the Martian globe. Yet the spatial resolution of HiRISE can be used to verify and study details in sites identified as suspicious by CTX.
The complimentary capabilities of the MRO instruments provide a fuller understanding of Mars together than their insights taken separately.MareKromium
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ESP_019569_1640_RED_abrowse-PCF-LXTT.jpgPortion of Huygens Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)94 visitenessun commentoMareKromium
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