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Astronaut Photography of Earth - Display Record

ISS005-E-20451

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	File Name	File Size (bytes)	Width	Height	Annotated	Cropped	Purpose	Comments
View	ISS005-E-20451.JPG	74691	540	540	Yes	Yes	NASA's Earth Observatory web site
View	ISS005-E-20451.JPG	85690	639	435	No	No		From STIC, color adjusted
View	ISS005-E-20451.JPG	238555	352	540			Photographic Highlights	(540 px resized images)
View	ISS005-E-20451.JPG	436965	1000	1504	No	No	NASA's Earth Observatory web site
View	ISS005-E-20451_2.JPG	448510	501	768			Photographic Highlights	(actual files used)

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	File Name	File Size (bytes)	Width	Height	Annotated	Cropped	Purpose	Comments
Request	ISS005-E-20451.JPG	1304543	3032	2064	No	No		From STIC, color adjusted

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Electronic Image Data

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Identification

Mission: ISS005 Roll: E Frame: 20451 Mission ID on the Film or image: ISS005
Country or Geographic Name: CHAD
Features: EMI KOUSSI, CRATER DETAIL
Center Point Latitude: 20.0 Center Point Longitude: 18.5 (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: 31
Camera Focal Length: 800mm
Camera: E4: Kodak DCS760C Electronic Still Camera
Film: 3060E : 3060 x 2036 pixel CCD, RGBG array.

Quality

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

Nadir

Date: 20021111 (YYYYMMDD)GMT Time: 082600 (HHMMSS)
Nadir Point Latitude: 20.0, Longitude: 20.6 (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction: West
Sun Azimuth: 141 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 206 nautical miles (382 km)
Sun Elevation Angle: 43 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 2702

Captions

Emi Koussi is a high volcano that lies at the south end of the Tibesti Mountains in the central Sahara in northern Chad. The volcano is one of several in the Tibesti massif, and reaches 3415 m in altitude, rising 2.3 km above the surrounding sandstone plains. The volcano is 65 km wide.

This view of the Emi Koussi caldera was taken with an 800 mm lens on November 21, 2002. It is detailed to the point that it doesn’t include the entire 10-km diameter of the caldera, but reveals individual lava strata within the walls of the summit cliffs. Nested within the main caldera is a smaller crater that contains white salts of a dry lake at its lowest point. Here too, strata are visible in the walls of the smaller crater. The smaller crater is surrounded by a region of darker rocks—a geologically young dome of lava studded with several small circular volcanic vents.

Emi Koussi has been used as a close analog to the famous Martian volcano Elysium Mons (http://www.msss.com/mars_images/moc/7_10_98_elysium_rel/). One of the most important morphological differences between volcanoes on Mars and Earth is the widespread furrowing of the surface due to flowing water on terrestrial volcanoes. The furrows are shallow valleys. Larger channels have a different origin. Major channels can be seen on volcanoes on both planets and indicate low points in caldera rims where lava spilled out of pre-collapse craters.

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