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  Image: Geographic Location Direction Photo #: STS058-88-17 Date: Oct. 1993
Geographic Region: MAURITANIA

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  STS058-88-17 Richat Structure, Mauritania October 1993
The Richat Structure, sometimes referred to as the Bull's Eye, can be seen in northwest-looking view. Contrary to a commonly believed notion, the structure was not made by the impact of a meteorite. The 24 mile (39km) wide structure was made by the erosion of layers of rock (limestone, sandstone, and shale) that domed upward. Geologists have not found any evidence of meteorite impact, surface volcanic activity, or salt. The best guess is that the structure was caused by deep injection of pre-volcanic melted rock (magma) that never quite ascended to Earth's surface. The depression or pit in which the domed rock rings sit is 328 feet (100 meters) deep from the surrounding plateau area (darker colored rock). The rock layers themselves are thought by many scientists to be several hundred million years old, and their variable resistance to erosion has produced a series of concentric ridges in the structure stepping down from the outside in. The structure is surrounded by fields of sand which is visible encroaching into the southern part of the structure. Small dry lakes or playas (whitish-gray color) are discernible to the east of the center part of the structure.
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Images: All Available Images Low-Resolution 267k
Mission: STS058  
Roll - Frame: 88 - 17
Geographical Name: MAURITANIA  
Center Lat x Lon: 21.0N x 11.5W
Film Exposure: U   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 0
Camera: HB
Camera Tilt: 30   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 250  
Nadir to Photo Center Direction: SW   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?: N   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number: 65  
Date: 19931022   YYYYMMDD
Time: 152651   GMT HHMMSS
Nadir Lat: 22.3N  
Latitude of suborbital point of spacecraft
Nadir Lon: 10.8W  
Longitude of suborbital point of spacecraft
Sun Azimuth: 237   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 154   nautical miles
Sun Elevation: 35   Angle in degrees between the horizon and the sun, measured at the nadir point
Water Views:  
Atmosphere Views:  
Man Made Views:  
City Views:  
Photo is not associated with any sequences

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