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The astrometric signature imposed by a planet on its primary increasessubstantially towards longer periods (proportinal to P^2/3), so thatlong-period planets can be more easily detected, in principle. For example, aone Solar-mass (M_Sun) star would be pulled by roughly 1 mas by a oneJupiter-mass (M_J) planet with a period of one-hundred years at a distance of20 pc. Such position accuracies can now be obtained with both ground-based andspace-based telescopes. The difficulty was that it often takes many decadesbefore a detectable position shift will occur. However, by the time the nextgeneration of astrometric missions such as SIM will be taking data, severaldecades will have past since the first astrometric mission, HIPPARCOS. Here wepropose to use a new astrometric method that employs a future, highly accurateSIM Quick-Look survey and HIPPARCOS data taken twenty years prior. Usingposition errors for SIM of 4 muas, this method enables the detection andcharacterization of Solar-system analogs (SOSAs) with periods up to 240 (500)years for 1 (10) M_J companions. Because many tens of thousands nearby starscan be surveyed this way for a modest expenditure of SIM time and SOSAs may bequite abundant, we expect to find many hundreds of extra-solar planets withlong-period orbits. Such a data set would nicely complement the short-periodsystems found by the radial-velocity method. Brown dwarfs and low-mass stellarcompanions can be found and characterized if their periods are shorter thanabout 500 years. This data set will provide invaluable constraints on models ofplanet formation, as well as a database for systems where the location of thegiant planets allow for the formation of low-mass planets in the habitablezone. [Abridged]

Finding Solar System Analogs With SIM and HIPPARCOS: A White Paper for the ExoPlanet Task Force