Camera on NASA Mars Odyssey Tops Decade of Discovery

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 TELEPHONE 818-354-5011
http://www.jpl.nasa.gov

Robert Burnham 480-458-8207
Arizona State University School of Earth and Space Exploration, Tempe
robert.burnham@asu.edu

Guy Webster 818-354-6278
Jet Propulsion Laboratory, Pasadena, Calif.
Guy.webster@jpl.nasa.gov

News feature: 2012-053 Feb. 29, 2012

Camera on NASA Mars Odyssey Tops Decade of Discovery

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.cfm?release=2012-053&cid=release_2012-053

Ten years ago, on Feb. 19, 2002, the Thermal Emission Imaging System (THEMIS), a
multi-band camera on NASA's Mars Odyssey orbiter, began scientific operations at the
Red Planet. Since then the camera has circled Mars nearly 45,000 times and taken more
than half a million images at infrared and visible wavelengths.

"THEMIS has proven itself a workhorse," said Philip Christensen of Arizona State
University, Tempe, the camera's principal investigator and designer. "It's especially
gratifying to me to see the range of discoveries that have been made using this
instrument."

Highlights of science results by THEMIS over the past 10 years include:

• Confirming a mineral exposure selected as the landing site for NASA's Mars Exploration
Rover Opportunity
• Discovering carbon-dioxide gas jets at the south polar ice cap in spring
• Discovering chloride salt deposits across the planet
• Making the best global image map of Mars ever done
• Identifying safe landing sites landing sites for NASA's Mars Phoenix lander by finding the
locations with the fewest hazardous boulders
• Monitoring dust activity in the Martian atmosphere
• Discovering that a large crater, Aram Chaos, once contained a lake
• Discovering that Mars has more water-carved channels than previously thought
• Discovering dacite on Mars, a more evolved form of volcanic lava not previously known
on the Red Planet

THEMIS combines a five-wavelength visual imaging system with a nine-wavelength
infrared imaging system. By comparing daytime and nighttime infrared images of an area,
scientists can determine many of the physical properties of the rocks and soils on the
ground.

Mars Odyssey has a two-hour orbit that is nearly "sun-synchronous," meaning that
Odyssey passes over the same part of Mars at roughly the same local time each day. In
September 2008 its orbit was shifted toward an earlier time of day, which enhanced
THEMIS' mineralogical detection capability.

Says Christensen, "Both Odyssey and THEMIS are in excellent health and we look
forward to years more science with them."

NASA launched the Mars Odyssey spacecraft April 7, 2001. Odyssey arrived at Mars Oct.
24, 2001. After arrival the spacecraft spent several months in a technique called
aerobraking, which involved dipping into the Martian atmosphere to adjust its orbit. In
February 2002, science operations began.

Odyssey is managed by NASA's Jet Propulsion Laboratory, Pasadena, for NASA's
Science Mission Directorate in Washington. Lockheed Martin Space Systems in Denver
built the spacecraft. JPL and Lockheed Martin collaborate on operating the spacecraft. For
more about the Mars Odyssey mission, visit: http://mars.jpl.nasa.gov/odyssey . For more
about THEMIS, see http://themis.asu.edu/ . JPL is a division of the California Institute of
Technology in Pasadena.

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