ESA and NASA select instruments for joint Mars mission

ESA and NASA have selected the scientific instruments for their first joint Mars mission. Scheduled for 2016, it will study the chemical makeup of the martian atmosphere, including mysterious methane.

NASA and ESA have embarked on a joint programme of martian exploration, an unprecedented new alliance for future ventures to Mars. The ExoMars Trace Gas Orbiter is the first in a planned series of joint missions leading to the return of a sample from the surface of Mars. Scientists worldwide were invited to propose the spacecraft's instruments.

"To fully explore Mars, we want to marshal all the talents we can on Earth," says David Southwood, ESA Director for Science and Robotic Exploration. "Now NASA and ESA are combining forces for the joint ExoMars Trace Gas Orbiter mission. Among its objectives is to characterise the planet's atmosphere, and in particular search for trace gases like methane.

ESA and NASA have now selected five science instruments from the 19 proposals submitted in January 2010 in response to an Announcement of Opportunity for the first mission. They were judged to have the best scientific value and lowest risk, and will be developed by international teams of scientists and engineers on both sides of the Atlantic.

The selected science instruments are:
# Mars Atmospheric Trace Molecule Occultation Spectrometer (MATMOS). An infrared spectrometer to detect very low concentrations of molecular constituents of the atmosphere. Principal Investigator: Paul Wennberg California Institute of Technology, Pasadena, USA. Participating countries: US, CA.
# High-resolution solar occultation and nadir spectrometer (SOIR/NOMAD). An infrared spectrometer to detect trace constituents in the atmosphere and to map their location on the surface. Principal Investigator: Ann Vandaele, Belgian Institute for Space Aeronomy, Brussels, Belgium. Participating countries: BE, IT, ES, GB, US, CA.
# ExoMars Climate Sounder (EMCS). An infrared radiometer to provide daily global measurements of dust, water vapour and chemical species in the atmosphere to aid the analysis of the spectrometer data. Principal Investigator: John Schofield, Jet Propulsion Laboratory, Pasadena, USA. Participating countries: US, GB, FR.
- High-resolution Stereo Color Imager (HiSCI). A camera to provide 4-colour stereo imaging at 2 m resolution per pixel over an 8.5 km swathe. Principal Investigator: Alfred McEwen, University of Arizona, Tucson, USA. Participating countries: US, CH, GB, IT, DE, FR.
# Mars Atmospheric Global Imaging Experiment (MAGIE). A wide-angle multi-spectral camera to provide global images in support of the other instruments. Principal Investigator: Bruce Cantor, Malin Space Science Systems, San Diego, USA. Participating countries: US, BE, FR, RU.

In addition to the Trace Gas Orbiter, the 2016 mission will carry Europe's entry, descent and landing demonstration vehicle. The whole mission will be launched on a NASA rocket.

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