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STS61A-35-86

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Identification

Mission: STS61A Roll: 35 Frame: 86 Mission ID on the Film or image: 61-A
Country or Geographic Name: CANADA-Q
Features: CLEARWATER LAKES
Center Point Latitude: 56.0 Center Point Longitude: -74.5 (Negative numbers indicate south for latitude and west for longitude)
Stereo: Yes (Yes indicates there is an adjacent picture of the same area)
ONC Map ID: JNC Map ID:

Camera

Camera Tilt: 35
Camera Focal Length: 250mm
Camera: HB: Hasselblad
Film: 5017 : Kodak, natural color positive, Ektachrome, X Professional, ASA 64, standard base.

Quality

Film Exposure: Normal
Percentage of Cloud Cover: 0 (0-10)

Nadir

Date: 19851101 (YYYYMMDD)GMT Time: 192044 (HHMMSS)
Nadir Point Latitude: 56.1, Longitude: -72.4 (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction: West
Sun Azimuth: 221 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 183 nautical miles (339 km)
Sun Elevation Angle: 11 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 34

Captions

STS61A-35-86 Clearwater Lakes, Quebec, Canada November 1985
These twin circular lakes (large dark features) were formed simultaneously by the impact of an asteroidal pair which slammed into the planet approximately 290 million years ago. The lakes are located near the eastern shore of Hudson Bay within the Canadian Shield in a region of generally low relief in northern Quebec province. Notice that the larger western structure contains a ring of islands that surrounds the center of the impact zone. The lakes are named after their exceedingly clear water. Also notice that the surrounding terrain shows widespread scarring from glaciation. The multitude of linear and irregular shaped lakes (dark features) are the result of gouging or scouring action caused by the continental ice sheets that once moved across this area.


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