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The Gateway to Astronaut Photography of Earth
Astronaut Photography of Earth - Display Record
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IdentificationMission: ISS020 Roll: E Frame: 29216 Mission ID on the Film or image: ISS020
Country or Geographic Name: CANADA-BC
Features: HA-ILTZUK ICEFIELD, SILVERTHRONE GLACIER, KLINAKLINI GLACIER
Center Point Latitude: 51.5 Center Point Longitude: -125.9 (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: 32
Camera Focal Length: 400mm
Camera: N3: Nikon D3
Film: 4256E : 4256 x 2832 pixel CMOS sensor, 36.0mm x 23.9mm, total pixels: 12.87 million, Nikon FX format.
Percentage of Cloud Cover: 10 (0-10)
NadirDate: 20090806 (YYYYMMDD)GMT Time: 215752 (HHMMSS)
Nadir Point Latitude: 49.7, Longitude: -126.7 (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction: North
Sun Azimuth: 215 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 187 nautical miles (346 km)
Sun Elevation Angle: 53 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 1394
CaptionsHeiltskuk Icefield, British Columbia, Canada
The Heiltskuk (also written Ha-Iltzuk) Icefield covers an area of approximately 3,600 square kilometers (1,389 square miles) in the southern Coast Mountains of British Columbia. This detailed astronaut photograph illustrates the icefield—mostly covered by snow across the upper mountain slopes—and two major valley glaciers that extend from it. Valley glaciers are large masses of slowly flowing ice and entrained debris that move downhill, carving out wide U-shaped valleys in the process. The locations of former valley glaciers can frequently be identified by the presence of these U-shaped valleys on a now glacier-free landscape.
The two largest valley glaciers in the image, Silverthrone Glacier and Klinaklini Glacier, both flow towards Knight Inlet to the south (not shown). Several moraines—accumulations of rock and soil debris along the edges and surface of a glacier—are drawn out into long, dark lines by the flowing ice, and they extend along the length of both glaciers. The confluence of the two glaciers at image center illustrates how a moraine located along the side of a glacier can become a medial moraine, in the center of the joined ice mass. Smaller valley glaciers are visible near Mount Silverthrone.
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Recommended Citation: Image Science and Analysis Laboratory, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." .