Paper:	Science with the Space Interferometry Mission
Volume:	167, Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era
Page:	38
Authors:	Shao, J.; Unwin, S.; Pitesky, M.
Abstract:	The Space Interferometry Mission (SIM) will be NASA's first dedicated space-based optical interferometer. SIM will produce a wealth of new astronomical data and serve as a technology pathfinder for future astrophysics missions. It will provide 4 microarcsecond (μas) precision absolute position measurements of stars down to 20th magnitude, and the corresponding parallax accuracy allows distance measurements to 10% accuracy on the far side of the Galaxy. With high-precision proper motions derived during its 5-year lifetime, SIM will address a variety of science questions relating to the formation, size, and dynamics of our Galaxy. In this paper we present selected topics from the SIM science program which bear upon determining the extragalactic distance scal

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