Aorounga Impact Crater, Chad



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English: 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 north-east at Aorounga, and sand dunes formed between the yardangs are actively migrating to the south-west.
Date 10 August 2009(2009-08-10)
Source NASA Earth Observatory
Author NASA Expedition 20 crew.

Image acquired with a Nikon D3 digital camera fitted with an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Centre.


Public domain This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)


Public Domain


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EXIF data:
File name aorounga_impact_crater__chad.jpg
Size, bytes 483829
Mime type image/jpeg
Image input equipment manufacturer NIKON CORPORATION
Image input equipment model NIKON D3
Orientation of image 1
Image resolution in width direction 3000000/10000
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Exposure time 1/6400
F number 56/10
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ISO speed rating 200
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Date and time original image was generated 2009:07:25 10:57:33
Date and time image was made digital data 2009:07:25 10:57:33
Shutter speed 12643856/1000000
Aperture 4970854/1000000
Exposure bias -10/6
Maximum lens aperture 50/10
Metering mode 3
Color space information 1
Exif image width 1440
Exif image length 960
Sensing method 2
Scene type 
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Digital zoom ratio 1/1
Focal length in 35 mm film 800
Software used Adobe Photoshop CS3 Windows
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