File:ISS020-E-026195 Aorounga Impact Crater Chad.jpg

‎{{int:filedesc}}: iss photo info template, ov, geo, jpl-tmpl
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{{Information
 
{{Information
 
|description={{en|1=The concentric ring structure of the Aorounga crater—renamed Aorounga South in the multiple-crater interpretation of SIR data—is clearly visible in this detailed astronaut photograph. The central highland, or peak, of the crater is surrounded by a small sand-filled trough; this in turn is surrounded by a larger circular trough. Linear rock ridges alternating with light orange sand deposits cross the image from upper left to lower right; these are called yardangs by geomorphologists. Yardangs form by wind erosion of exposed rock layers in a unidirectional wind field. The wind blows from the northeast at Aorounga, and sand dunes formed between the yardangs are actively migrating to the southwest.}}
 
|description={{en|1=The concentric ring structure of the Aorounga crater—renamed Aorounga South in the multiple-crater interpretation of SIR data—is clearly visible in this detailed astronaut photograph. The central highland, or peak, of the crater is surrounded by a small sand-filled trough; this in turn is surrounded by a larger circular trough. Linear rock ridges alternating with light orange sand deposits cross the image from upper left to lower right; these are called yardangs by geomorphologists. Yardangs form by wind erosion of exposed rock layers in a unidirectional wind field. The wind blows from the northeast at Aorounga, and sand dunes formed between the yardangs are actively migrating to the southwest.}}
 
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{{ISS Crew Earth Observations
 
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|mission= ISS020
 
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|roll= E
 
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|frame= 26195
 
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|geoname= CHAD
 
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|features= AOROUNGA IMPACT CRATER, YARDANGS
 
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|cp-lat= 19.1
 
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|cp-long= 19.2
 
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|camera-tilt= 42
 
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|camera-fl= 800
 
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|camera= Nikon D3
 
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|film= 4256 x 2832 pixel CMOS sensor, 36.0mm x 23.9mm, total pixels: 12.87 million, Nikon FX format.
 
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|exposure=
 
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|cloudcover= 10
 
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|date= 20090725
 
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|time= 105733
 
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|nadirlat= 21.5
 
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|nadirlong= 20.7
 
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|nadirdirection= Southwest
 
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|azimuth= 242
 
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|issalt= 187
 
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|sunelevation= 86
 
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|orbitnumber= 1198
 
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|caption= Aorounga Impact Crater, Chad
 
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Aorounga Impact Crater is located in the Sahara Desert, in north-central Chad, and is one of the best preserved impact structures in the world. The crater is thought to be middle or upper Devonian to lower Mississippian (approximately 345–370 million years old) based on the age of the sedimentary rocks deformed by the impact. Spaceborne Imaging Radar (SIR) data collected in 1994 suggests that Aorounga is one of a set of three craters formed by the same impact event. The other two suggested impact structures are buried by sand deposits.
 
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The concentric ring structure of the Aorounga crater—renamed Aorounga South in the multiple-crater interpretation of SIR data—is clearly visible in this detailed astronaut photograph. The central highland, or peak, of the crater is surrounded by a small sand-filled trough; this in turn is surrounded by a larger circular trough. Linear rock ridges alternating with light orange sand deposits cross the image from upper left to lower right; these are called yardangs by geomorphologists. Yardangs form by wind erosion of exposed rock layers in a unidirectional wind field. The wind blows from the northeast at Aorounga, and sand dunes formed between the yardangs are actively migrating to the southwest.}}
 
|date=2009-07-25 10:57:33
 
|date=2009-07-25 10:57:33
 
|source=[http://eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS020&roll=E&frame=26195 ISS020-E-26195]
 
|source=[http://eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS020&roll=E&frame=26195 ISS020-E-26195]
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*{{User:Julian Herzog/DerivativeInfoTemplate|modifications=grading, noise removal and vignette correction.}}
 
*{{User:Julian Herzog/DerivativeInfoTemplate|modifications=grading, noise removal and vignette correction.}}
 
|permission=
 
|permission=
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|other_versions=
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|other_versions=File:Aorounga Impact Crater, Chad.jpg|Original version as rendered by NASA
 
|other_fields=
 
|other_fields=
 
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{{Object location dec|19.1|19.2}}
 
{{Location dec|21.5|20.7}}
 
{{Location dec|21.5|20.7}}
 
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{{NASA-image|center=JSC|id=ISS020-E-026195}}
 

 

 
=={{int:license-header}}==
 
=={{int:license-header}}==

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