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The Gateway to Astronaut Photography of Earth
(NASA Crew Earth Observations)
Astronaut Photography of Earth - Display Record
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IdentificationMission: ISS016 Roll: E Frame: 12047 Mission ID on the Film or image: ISS016
Country or Geographic Name: CHILE
Features: TYNDALL GLACIER, LAKE GEIKIE
Center Point Latitude: -51.1 Center Point Longitude: -73.3 (Negative numbers indicate south for latitude and west for longitude)
Stereo: (Yes indicates there is an adjacent picture of the same area)
ONC Map ID: JNC Map ID:
CameraCamera Tilt: High Oblique
Camera Focal Length: 400mm
Camera: E4: Kodak DCS760C Electronic Still Camera
Film: 3060E : 3060 x 2036 pixel CCD, RGBG array.
Percentage of Cloud Cover: 10 (0-10)
NadirGMT Date: 20071122 (YYYYMMDD) GMT Time: 191337 (HHMMSS)
Nadir Point Latitude: -51.7, Longitude: -79.1 (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction: East
Sun Azimuth: 308 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 186 nautical miles (344 km)
Sun Elevation Angle: 50 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 3579
CaptionsTyndall Glacier, Chile
Tyndall Glacier is located in the Torres del Paine National Park in Chile. This glacier, which has a total area of 331 square kilometers and a length of 32 kilometers (based on 1996 measurements), begins in the Patagonian Andes Mountains to the west and terminates in Lago Geikie. The digital astronaut photograph records visible light in red, green, and blue wavelengths (true color). The Tyndall Glacier terminus has retreated significantly during the past 17 years. Significant ice loss was also observed earlier this year at Grey Glacier, about 30 kilometers to the north-northeast, suggesting both glaciers are responding similarly to regional changes in temperature and precipitation.
A medial moraine is visible in the center of the glacier, extending along its length (top image, center left). Moraines—accumulations of soil and rock debris—form along the edges of a glacier as it flows downhill across the landscape (much like a snowplow builds ridges of snow along the roadside). Glaciers flowing downslope through adjacent valleys merge when they encounter each other, and debris entrained along their sides becomes concentrated in the central portion of the new combined ice mass, much as small streams join to form a river.
Crevasse fields are also visible in the image. The crevasses—small, but potentially quite deep fissures—form as a result of stress between slower- and faster-moving ice within the glacier. Crevasse fields on Tyndall Glacier are most evident near rock promontories extending into the glacier; these rock outcrops cause the ice to slow as it flows around the obstruction.
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Recommended Citation: Earth Science and Remote Sensing Unit, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." .