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File:Emi Koussi Volcano and Aorounga Impact Crater, Chad (enhanced).jpg

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English: Emi Koussi Volcano and Aorounga Impact Crater, Chad are featured in this image photographed by an Expedition 30 crew member on the International Space Station.
  • This striking photograph features two examples of circular landscape features - labeled as craters - that were produced by very different geological processes. At left, the broad grey-green shield volcano of Emi Koussi is visible. The volcano is marked by three overlapping calderas formed by eruptions; these form a large oblong depression at the 3,415 meter ASL summit of the volcano. A smaller crater sits within the larger caldera depression.
  • While volcanic activity has not been observed, nor is mentioned in the historical record, an active thermal area is located on the southern flank. The circular Aorounga Impact Crater is located approximately 110 kilometers to the southeast of Emi Koussi and has its origin in forces from above rather than eruptions from below.
  • According to scientists, the Aorounga structure is thought to record a meteor impact approximately 345-370 million years ago. The circular feature visible at upper right may be only one of three impact craters formed by the same event -- the other two are buried by sand deposits. The linear features (lower right) that arc around Emi Koussi and overprint Aorounga and the surrounding bedrock are known as yardangs; these are rock ridges formed by wind erosion.


International Space Station InsigniaISS Crew Earth Observations: ISS030-E-005456International Space Station Insignia
Identification
Mission ISS030 (Expedition 30)
Roll E
Frame 005456
Country or Geographic Name CHAD
Features EMI KOUSSI VOLCANO, AORUNGA IMPACT CRATER, YARDANGS
Center Point Latitude 19.5° N
Center Point Longitude 18.5° E
Camera
Camera Tilt 21°
Camera Focal Length 48 mm
Camera Nikon D2Xs
Film 4288 x 2848 pixel CMOS sensor, RGBG imager color filter.
Quality
Percentage of Cloud Cover 0-10%
Nadir What is Nadir?
Date 2011-11-26
Time 09:34:03
Nadir Point Latitude 19.6° N
Nadir Point Longitude 19.8° E
Nadir to Photo Center Direction West
Sun Azimuth 161°
Spacecraft Altitude 205 nautical miles (380 km)
Sun Elevation Angle 48°
Date
Source Spaceflight.NASA.gov: ISS030-E-005456
Author NASA
Other versions
  • Original.
    Original.
  • Version with annotations.
    Version with annotations.
Object location19° 30′ 00″ N, 18° 30′ 00″ E Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
Camera location19° 36′ 00″ N, 19° 48′ 00″ E Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo


 This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Removed color cast. Modifications made by FerJox.


This image or video was catalogued by Johnson Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ISS030-E-005456.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
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Licensing edit

Public domain
This file is in the public domain in the United States because it was created by the Image Science & Analysis Laboratory, of the NASA Johnson Space Center. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA media use guidelines or Conditions of Use of Astronaut Photographs). Photo source: ISS030-E-5456.

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current22:22, 26 June 2019Thumbnail for version as of 22:22, 26 June 20194,288 × 2,848 (2.5 MB)FerJox (talk | contribs)User created page with UploadWizard

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