| Piú viste - Mars Reconnaissance Orbiter (MRO) |
ESP_011386_2065_cut.jpgCollapse Pit in Tractus Fossae (edm - Vertical View - Natural Colors; credits: Lunar Explorer Italia)53 visiteThis HiRISE image shows a collapse pit in Tractus Fossae, a Region of large Ridges and Troughs created by Tectonic Activity.
The Fossae occur on the Tharsis Volcanic Rise, a giant region of enhanced volcanic activity that includes the 3 large volcanoes Ascraeus Mons, Pavonis Mons and Arsia Mons.
The Pit in this image has very steep walls, and so only a narrow arc is illuminated by Sunlight. The rest of the Pit is in dark shadow.
However, a stretched version of the image shows details of the pit floor, due to a small amount of scattered Sunlight.
Pits like this form by collapse into underground voids, such as those left by propagating magma-filled dikes.
They may sometimes have overhanging walls, although in this case the walls can be seen and appear nearly vertical. Some similar features are found on Earth: Devil’s Throat, in Hawaii, is one example.
Other similar examples have been imaged on Mars as well.MareKromium
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ESP_011496_1100_RED_abrowse.jpgJeans Crater's Dunefield Seasonal Monitoring (Natural Colors; credits: Lunar Explorer Italia)53 visiteMars Local Time: 16:25 (middle afternoon)
Coord. (centered): 69,6° South Lat. and 153,3° East Long.
Spacecraft altitude: 251,1 Km (such as about 156,9 miles)
Original image scale range: 50,2 cm/pixel (with 1 x 1 binning) so objects ~ 1,51 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 9,5°
Phase Angle: 71,0°
Solar Incidence Angle: 79° (meaning that the Sun is about 11° above the Local Horizon)
Solar Longitude: 187,7° (Northern Autumn)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_011477_1275_RED_abrowse.jpgHuge Seepage in Argyre Region (Natural Colors; credits: Lunar Explorer Italia)53 visiteMars Local Time: 16:02 (middle afternoon)
Coord. (centered): 52,0° South Lat. and 304,9° East Long.
Spacecraft altitude: 251,0 Km (such as about 156,9 miles)
Original image scale range: 25,1 cm/pixel (with 1 x 1 binning) so objects ~ 75 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 1,6°
Phase Angle: 71,6°
Solar Incidence Angle: 70° (meaning that the Sun is about 20° above the Local Horizon)
Solar Longitude: 186,9° (Northern Autumn)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_011460_0980_RED_abrowse.jpgMonitor Seasonal Changes at a South Polar Cracked and Gullied Site (Natural Colors; credits: Lunar Explorer Italia)53 visiteMars Local Time: 17:02 (middle afternoon)
Coord. (centered): 81,7° South Lat. and 66,3° East Long.
Spacecraft altitude: 246,5 Km (such as about 154,1 miles)
Original image scale range: 49,3 cm/pixel (with 1 x 1 binning) so objects ~ 1,48 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 1,2°
Phase Angle: 86,5°
Solar Incidence Angle: 85° (meaning that the Sun is about 5° above the Local Horizon)
Solar Longitude: 186,1° (Northern Autumn)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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ESP_011403_1905_RED_abrowse.jpgCone at the Source of Athabasca Valles (Natural - but strongly enhanced - Colors; credits: Lunar Explorer Italia)53 visiteMars Local Time: 15:50 (middle afternoon)
Coord. (centered): 10,2° North Lat. and 157,4° East Long.
Spacecraft altitude: 278,4 Km (such as about 174,0 miles)
Original image scale range: 27,8 cm/pixel (with 1 x 1 binning) so objects ~ 84 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 7,7°
Phase Angle: 50,7°
Solar Incidence Angle: 58° (meaning that the Sun is about 32° above the Local Horizon)
Solar Longitude: 183,6° (Northern Autumn)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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