Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dda....39.1102u&link_type=abstract
American Astronomical Society, DDA meeting #39, #11.02
Astronomy and Astrophysics
Astrophysics
Scientific paper
SIM is the Space Interferometry Mission, a flexibly-scheduled instrument for microarcsecond accuracy astrometry in the optical. The ability to measure stellar positions and parallaxes to 4 μas opens up a wide range of dynamical phenomena in modern astrophysics for study. Over a narrow field, its single measurement accuracy of 1 μas allows astrometric detection of planetary systems around a large sample of nearby stars, including Earth-mass planets orbiting in the `Habitable Zone'.
SIM will probe our Galaxy through the dynamics of halo stars and tidal streams from dwarf spheroidal galaxies, and it will measure accurate masses for many star types, including X-ray binaries. It will have the sensitivity to detect astrometric motion in the cores of active galactic nuclei, opening up the dynamical study of accretion disks and parsec-scale relativistic jets in the optical band. In 2005, the SIM project completed its technology development. Since then, it has performed trade studies to arrive at a mission that meets the peer-reviewed science objectives and reduces cost and complexity. It is being studied by NASA as a flight mission.
The research described in this talk was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
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