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Toward inertial reference frames with the SIM observatory

Published online by Cambridge University Press:  06 January 2010

Valeri V. Makarov
Valeri V. Makarov*
Affiliation:
NASA Exoplanet Science Institut, Caltech, 770 S. Wilson Ave., MS 100-22, Pasadena, CA, USA email: vvm@caltech.edu
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Abstract

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The SIM Lite Observatory is expected to provide a global astrometric reference frame surpassing the 1-μas accuracy threshold in some spherical harmonics. A range of time-varying physical distortions of the reference frame will become observable as large-scale perturbations of the proper motion field. I consider the main sources of the apparent and physical motion of reference objects, such as the aberration of light caused by the acceleration of SIM, long gravitational waves and hypothetical rotation of the Universe, and present some estimates of the astrometric sensitivity to these effects. I argue that a global solution and covariance analysis is of crucial importance for the SIM mission to differentiate the inevitable accidental and systematic zonal errors from real physical phenomena.

Keywords

astrometryreference systemsgravitational waveslarge-scale structure of universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S261: Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis , April 2009 , pp. 345 - 349
Copyright
Copyright © International Astronomical Union 2010

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