Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..749p&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 749-754
Astronomy and Astrophysics
Astrophysics
4
Scientific paper
The Space Interferometry Mission is expected to be launched in 2004. The mission, following closely the recommendations of the Bahcall Commission, will determine positions of point sources to an accuracy of 4 microarcsec globally and to 1 microarcsec over small angles (=< 1 deg). The instrument, based on the OSI architecture proposed by Michael Shao, will reach 20 mag in 3 x 10^4 sec and has a nominal lifetime of 5 yr. A nulling capability will be provided and synthesis imaging and near-IR capabilities are being considered. These capabilities, extending the Hipparcos mission by almost three orders of magnitude in every sense, argue for an extraordinary return in scientific results. We expect to challenge our understanding of stellar evolution, to define the nature of the Milky Way in terms of both its global parameters and the various perturbations, to map out the kinematics of the Galaxy's satellites and the other members of the local group and to measure accurate distances to several nearby spirals. In this paper we will outline NASA's expectations for the scientific return from the SIM mission in the areas of Stellar Physics, Galactic Structure, and Extragalactic Astrophysics including the distance scale problem.
Peterson Darrell
Shao Maxine
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