ISS030-E-5456
| NASA Photo ID | ISS030-E-5456 |
| Focal Length | 48mm |
| Date taken | 2011.11.26 |
| Time taken | 09:34:03 GMT |
Resolutions offered for this image:
1000 x 664 pixels 540 x 359 pixels 720 x 480 pixels 4288 x 2848 pixels 640 x 425 pixels
1000 x 664 pixels 540 x 359 pixels 720 x 480 pixels 4288 x 2848 pixels 640 x 425 pixels
Cloud masks available for this image:
Spacecraft nadir point: 19.6° N, 19.8° E
Photo center point: 19.5° N, 18.5° E
Photo center point by machine learning:
Photo center point: 19.5° N, 18.5° E
Photo center point by machine learning:
Nadir to Photo Center: West
Spacecraft Altitude: 205 nautical miles (380km)
Country or Geographic Name: | CHAD |
Features: | EMI KOUSSI VOLCANO, AORUNGA IMPACT CRATER, YARDANGS |
| Features Found Using Machine Learning: | |
Cloud Cover Percentage: | 0 (no clouds present) |
Sun Elevation Angle: | 48° |
Sun Azimuth: | 161° |
Camera: | Nikon D2Xs Electronic Still Camera |
Focal Length: | 48mm |
Camera Tilt: | 21 degrees |
Format: | 4288E: 4288 x 2848 pixel CMOS sensor, RGBG imager color filter |
Film Exposure: | |
| Additional Information | |
| Width | Height | Annotated | Cropped | Purpose | Links |
|---|---|---|---|---|---|
| 1000 pixels | 664 pixels | No | Yes | Earth From Space collection | Download Image |
| 540 pixels | 359 pixels | Yes | Yes | Earth From Space collection | Download Image |
| 720 pixels | 480 pixels | Yes | Yes | NASA's Earth Observatory web site | Download Image |
| 4288 pixels | 2848 pixels | No | No | Download Image | |
| 640 pixels | 425 pixels | No | No | Download Image |
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Image Caption: Emi Koussi Volcano and Aorounga Impact Crater, Chad
This striking astronaut photograph from the International Space Station features two examples of circular landscape features--labeled as craters--that were produced by very different geological processes. At image 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 km to the southeast of Emi Koussi and has its origin in forces from above rather than eruptions from below. The Aorounga structure is thought to record a meteor impact approximately 345-370 million years ago. The circular feature visible at image 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 (image 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.
This striking astronaut photograph from the International Space Station features two examples of circular landscape features--labeled as craters--that were produced by very different geological processes. At image 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 km to the southeast of Emi Koussi and has its origin in forces from above rather than eruptions from below. The Aorounga structure is thought to record a meteor impact approximately 345-370 million years ago. The circular feature visible at image 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 (image 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.
