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Photographing the Earth from the International Space Station

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View ISS018-E-18110.JPG 52074640437 No No
View ISS018-E-18110.JPG 269850540417 Yes Yes NASA's Earth Observatory web site
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Mission: ISS018 Roll: E Frame: 18110 Mission ID on the Film or image: ISS018
Country or Geographic Name: KERGUELEN ILES
Features: S. HOWE I., RHODES B., I., PEN.
Center Point: Latitude: -48.9 Longitude: 69.4 (Negative numbers indicate south for latitude and west for longitude)

Stereo: (Yes indicates there is an adjacent picture of the same area)


Camera Tilt: 19
Camera Focal Length: 800mm
Camera: N2: Nikon D2Xs
Film: 4288E : 4288 x 2848 pixel CMOS sensor, RGBG imager color filter.


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


GMT Date: 20090106 (YYYYMMDD) GMT Time: 083056 (HHMMSS)
Nadir Point Latitude: -49.4, Longitude: 68.4 (Negative numbers indicate south for latitude and west for longitude)

Nadir to Photo Center Direction: Northeast
Sun Azimuth: 331 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 193 nautical miles (357 km)
Sun Elevation Angle: 61 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 2049


Kerguelen Kelp Beds, Southern Indian Ocean

Mac Murdo and Howe Islands are 2 of the 300 islands of the remote Kerguélen Archipelago, located in the southern Indian Ocean. The islands are part of a larger island group called the French Southern and Antarctic Lands. The Kerguelen Archipelago is also called the “Desolation Islands.” The coastal regions of the islands support low-growing vegetation (mainly the genus Acaena), while elevations above 50 meters are bare rock. There are no permanent (human) residents on the islands, but a permanent settlement (Port aux Français) hosts visiting biologists, oceanographers, and other Earth scientists. In addition, the settlement maintains a weather station and a satellite/rocket tracking station.

Weather conditions on the Kerguélen Islands are typical for the latitude; at 49 degrees South, the islands sit at the crossroads of the latitude zones referred to as the “roaring forties” and the “furious fifties.” This astronaut photograph was captured on January 6, 2009—early summer in the Southern Hemisphere. That day, the mean daily temperature was 4.5 degrees Celsius (40.1 degrees Fahrenheit), with mean westerly winds of 9 meters per second (about 20 miles per hour).

The coastlines of many sub-Antarctic islands, like the Kerguélen Islands, are occupied by highly productive giant kelp beds (Macrocystis pyrifera). One of the largest marine macroalgaes (seaweeds), the species can grow to lengths of 50 meters (164 feet), forming undersea forests in hard-bottom, subtidal areas (nearshore areas that remain underwater at low tide). Fronds can spread out to form a canopy that totally covers the water surface; we interpret the black patches surrounding coastal areas in this astronaut photograph as offshore kelp beds. These kelp forests are habitat for marine animals, and due to their large biomass and relatively long survival, they are an efficient sink (storage location) for atmospheric carbon dioxide.

The surface wave pattern that travels southeastward along the gray-blue ocean surface and through the kelp beds is visible due to sunglint, the mirror-like reflection of sunlight off the water. The sunglint also improves the identification of the kelp beds by creating a different water texture (and therefore a contrast) between the dark vegetation and the reflective ocean surface.

Kerguélen Archipelago hosts thousands of marine birds (penguins, albatrosses, and petrels among others) and seals (elephant and Antarctic fur species). Whales (humpback) and dolphins (killer whales and Commerson’s dolphin) are very common in the area. Fishing boats also frequent the Archipelago—including unlicensed, so-called “pirate,” fishing vessels.

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