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Photographing the Earth from the International Space Station

Astronaut Photography of Earth - Display Record

ISS018-E-18129

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File NameFile Size (bytes)WidthHeightAnnotatedCroppedPurposeComments
View ISS018-E-18129.JPG 53354640437 No No
View ISS018-E-18129.JPG 217385540367 Yes Yes NASA's Earth Observatory web site
View ISS018-E-18129.JPG 38886930722098 No No
View ISS018-E-18129.JPG 5852241000680 No Yes NASA's Earth Observatory web site

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Electronic Image Data

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Identification

Mission: ISS018 Roll: E Frame: 18129 Mission ID on the Film or image: ISS018
Country or Geographic Name: TOKELAU
Features: ATAFU ATOLL
Center Point: Latitude: -8.6 Longitude: -172.5 (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: 18
Camera Focal Length: 800mm
Camera: N2: Nikon D2Xs
Film: 4288E : 4288 x 2848 pixel CMOS sensor, RGBG imager color filter.

Quality

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

Nadir

GMT Date: 20090106 (YYYYMMDD) GMT Time: 202711 (HHMMSS)
Nadir Point Latitude: -9.4, Longitude: -173.1 (Negative numbers indicate south for latitude and west for longitude)

Nadir to Photo Center Direction: Northeast
Sun Azimuth: 112 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 189 nautical miles (350 km)
Sun Elevation Angle: 42 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 2057

Captions

Atafu Atoll, Tokelau, Southern Pacific Ocean

At roughly eight kilometers wide, Atafu Atoll is the smallest of three atolls and one island (Nukunonu and Fakaofo Atolls to the southeast and Swains Island to the south are not shown) comprising the Tokelau Islands group located in the southern Pacific Ocean. The political entity of Tokelau is currently a territory of New Zealand. In recent years, public referendums on independence within the islands have been held, but have not received sufficient support to move forward.

The primary settlement on Atafu is a village located at the northwestern corner of the atoll—indicated by an area of light gray dots in this astronaut photograph. The typical ring shape of the atoll is the result of coral reefs building up around a former volcanic island. Over geologic time, the central volcano has subsided beneath the water surface, leaving the fringing reefs and a central lagoon that contains submerged coral reefs. Erosion and soil development on the surfaces of the exposed fringing reefs have formed tan to light-brown beach deposits (southern and western sides of the atoll) and allowed vegetation to take root (northern and eastern sides of the atoll).

The Tokelau Islands, including Atafu Atoll, suffered significant inundation and erosion during Tropical Cyclone Percy in 2005. The approximate elevation of Atafu Atoll is only two meters above the tidal high-water level. Vulnerability to tropical cyclones and potential sea level rise make the long-term habitability of the atoll uncertain.


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