Astrometry as an Exoplanet Discovery Method

摘要: Astrometry consists in measuring the positions and motions of astronomical objects on sky compared to other stars. The increased accuracy such measurements opens way determine not only proper stars their parallactic displacements due Earth motion around Sun but also orbital caused by presence orbiting planets all nature. Several techniques have been investigated using different types instrument with limited impact exoplanet detection so far, technique has great potentials is complementary discovery methods. importance stability precision astrometric over a long period may explain relative lack results, advent space mission like Gaia will certainly change astrometry field.