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The European Space Agency Gaia satellite, planned for launch in late 2013,will perform systematic astrometric observations of the whole sky over a fiveyear period. During this mission many thousands of Solar System Objects down tomagnitude V=20 will be observed including Near-Earth Asteroids and objects atSolar elongations as low as 45 degrees, which are difficult to observe withground-based telescopes. We simulated the detection of Trojan asteroids in theorbits of Earth and Mars by Gaia. We find that Gaia will not detect the EarthTrojan 2010 TK7 although it will detect any Earth Trojans with diameters largerthan 600 m. We also find that Gaia will detect the currently known Mars Trojansand could discover more than 100 new Mars Trojans as small as 400 m indiameter. The results of the Gaia mission will test the predictions about theMars Trojan asteroid population and lead to greater understanding about theevolution of the Solar System.

Predictions for the Detection of Earth and Mars Trojan Asteroids by the Gaia satellite