The principal investigator for one of the instruments, and the management for NASA's roles in the mission, are based at NASA's Jet Propulsion Laboratory, Pasadena, Calif.

The ExoMars Trace Gas Orbiter, scheduled to launch in 2016, is the first of three joint robotic missions to the Red Planet. It will study the chemical makeup of the Martian atmosphere with a 1000-fold increase in sensitivity over previous Mars orbiters.

The mission will focus on trace gases, including methane, which could be potentially geochemical or biological in origin and be indicators for the existence of life on Mars. The mission also will serve as an additional communications relay for Mars surface missions beginning in 2018.

"Independently, NASA and ESA have made amazing discoveries up to this point," said Ed Weiler, associate administrator of NASA's Science Mission Directorate in Washington. "Working together, we'll reduce duplication of effort, expand our capabilities and see results neither ever could have achieved alone."

NASA and ESA invited scientists worldwide to propose the spacecraft's instruments. The five selected were from 19 proposals submitted in January. Both agencies evaluated the submissions and chose those with the best science value and lowest risk.

The selection of the instruments begins the first phase of the new NASA-ESA alliance for future ventures to Mars. The instruments and the principal investigators are:

+ Mars Atmosphere Trace Molecule Occultation Spectrometer - A spectrometer designed to detect very low concentrations of the molecular components of the Martian atmosphere: Paul Wennberg, California Institute of Technology, Pasadena, Calif.

+ High Resolution Solar Occultation and Nadir Spectrometer - A spectrometer designed to detect traces of the components of the Martian atmosphere and to map where they are on the surface: Ann C. Vandaele, Belgian Institute for Space Aeronomy, Brussels, Belgium.

+ ExoMars Climate Sounder - An infrared radiometer that provides daily global data on dust, water vapor and other materials to provide the context for data analysis from the spectrometers: John Schofield, NASA's Jet Propulsion Laboratory.

+ High Resolution Color Stereo Imager - A camera that provides four-color stereo imaging at a resolution of two million pixels over an 8.5 kilometer (5.3 mile) swath: Alfred McEwen, University of Arizona, Tucson.

+ Mars Atmospheric Global Imaging Experiment - A wide-angle, multi-spectral camera to provide global images of Mars in support of the other instruments: Bruce Cantor, Malin Space Science Systems, San Diego.

The science teams on all the instruments have broad international participation from Europe and the United States, with important hardware contributions from Canada and Switzerland.

"To fully explore Mars, we want to marshal all the talents we can on Earth," said David Southwood, ESA director for Science and Robotic Exploration.

"Now NASA and ESA are combining forces for the joint ExoMars Trace Gas Orbiter mission. Mapping methane allows us to investigate further that most important of questions: Is Mars a living planet, and if not, can or will it become so in the future?"

NASA and ESA share a common interest in conducting robotic missions to the Red Planet for scientific purposes and to prepare for possible human visits.

After a series of extensive discussions, the science heads of both agencies agreed on a plan of cooperation during a July 2009 meeting in Plymouth, England, later confirmed by ESA Director General Jean-Jacques Dordain and NASA Administrator Charles Bolden in a statement of intent that was signed in November 2009.

The plan consists of two Mars cooperative missions in 2016 and 2018, and a later joint sample return mission. The 2016 mission features the European-built ExoMars Trace Gas Orbiter, a European-built small lander demonstrator, a primarily-U.S. international science payload, and NASA-provided launch vehicle and communications components. ESA member states will provide additional instrument support.

The 2018 mission consists of a European rover with a drilling capability, a NASA rover capable of caching selected samples for potential future return to Earth, a NASA landing system, and a NASA launch vehicle.

These activities are designed to serve as the foundation of a cooperative program to increase science returns and move the agencies toward a joint Mars sample return mission in the 2020s.

NASA's Mars Exploration Program seeks to characterize and understand Mars as a dynamic system, including its present and past environment, climate cycles, geology and potential for life. JPL, a division of Caltech, manages the program and development of the NASA-supplied instruments for the 2016 orbiter for NASA's Science Mission Directorate in Washington.

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