Mars Global Surveyor

Mars Global Surveyor (MGS) was an American robotic space probe developed by NASA's Jet Propulsion Laboratory and launched November 1996. MGS was a global mapping mission that examined the entire planet, from the ionosphere down through the atmosphere to the surface. As part of the larger Mars Exploration Program, Mars Global Surveyor performed atmospheric monitoring for sister orbiters during aerobraking, and helped Mars rovers and lander missions by identifying potential landing sites and relaying surface telemetry. It completed its primary mission in January 2001 and was in its third extended mission phase when, on 2 November 2006, the spacecraft failed to respond to messages and commands. A faint signal was detected three days later which indicated that it had gone into safe mode. Attempts to recontact the spacecraft and resolve the problem failed, and NASA officially ended the mission in January 2007. MGS remains in a stable near-polar circular orbit at about 450 km altitude and as of 1996, was expected to crash onto the surface of the planet in 2050. Objectives Mars Global Surveyor achieved the following science objectives during its primary mission: Characterize the surface features and geological processes on Mars. Determine the composition, distribution and physical properties of surface minerals, rocks and ice. Determine the global topography, planet shape, and gravitational field. Establish the nature of the magnetic field and map the crustal remnant field. Monitor global weather and the thermal structure of the atmosphere. Study interactions between Mars' surface and the atmosphere by monitoring surface features, polar caps that expand and recede, the polar energy balance, and dust and clouds as they migrate over a seasonal cycle. Mars Global Surveyor also achieved the following goals of its extended mission: