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Photographing the Earth from the International Space Station

Astronaut Photography of Earth - Display Record

ISS035-E-25019

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File NameFile Size (bytes)WidthHeightAnnotatedCroppedPurposeComments
View ISS035-E-25019.JPG 81987640426 No No
View ISS035-E-25019.JPG 229288540359 Yes Yes NASA's Earth Observatory web site
View ISS035-E-25019.JPG 4427221440960 No Yes NASA's Earth Observatory web site
View ISS035-E-25019.JPG 4641461000665 No Yes NASA's Earth Observatory web site
View ISS035-E-25019.JPG 89947342562832 No No

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Electronic Image Data

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Identification

Mission: ISS035 Roll: E Frame: 25019 Mission ID on the Film or image: ISS035
Country or Geographic Name: ARGENTINA
Features: LAGUNA VERDE CATAMARCA, SALT DEPOSITS, LAGUNA NEGRA, RIDGES
Center Point: Latitude: -27.5 Longitude: -68.7 (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:

Camera

Camera Tilt: 15
Camera Focal Length: 400mm
Camera: N5: Nikon D3S
Film: 4256E : 4256 x 2832 pixel CMOS sensor, 36.0mm x 23.9mm, total pixels: 12.87 million, Nikon FX format.

Quality

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

Nadir

GMT Date: 20130420 (YYYYMMDD) GMT Time: 151217 (HHMMSS)
Nadir Point Latitude: -28.4, Longitude: -68.2 (Negative numbers indicate south for latitude and west for longitude)

Nadir to Photo Center Direction: Northwest
Sun Azimuth: 28 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 226 nautical miles (419 km)
Sun Elevation Angle: 46 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number:

Captions

Laguna Verde, Andes Mts., Argentina

This striking and detailed astronaut photograph from the International Space Station shows water of different color within subbasins of the Laguna (lake) Verde in the high Andes of northwest Argentina. The lake floor as a local low point lies at 4095 m (13,438 feet) above sea level, whereas the peak of the local volcano west of the lake (not shown) reaches over 3000 meters higher (6818 m, 22,368 feet). Laguna Verde (58 km wide, 36 km long) often appears green, giving rise to its formal name.

This image shows the turquoise tint in the central subbasin (image center), with a yellow to black tinge to water in the southern subbasin at image left (also known locally as Laguna Negro). The northernmost basin at image right appears quite black, and the large gray zone comprising much of the rest of Laguna Verde is likely a combination of shallow water, only inches deep, and sunglint reflecting off the water surface. The reason for the color differences lays in the fact the many different families of salt-loving organisms occupy hypersaline lakes such as Laguna Verde. These appear as different colors often bright -- depending on the salinities and temperatures of each water body or subbasin.

The rest of the lake floor is dry and appears white from the build-up of thick salt deposits. Parallel lines around the southern subbasin (Laguna Negro) indicate prior shorelines of this shrinking water body evaporation removes water but leaves ephemeral shorelines marked with white salt.


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