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Observational Model for Precision Astrometry with the Space Interferometry Mission

Published online by Cambridge University Press:  12 April 2016

Slava G. Turyshev  and
Mark H. Milman
Slava G. Turyshev
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109
Mark H. Milman
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109

Abstract

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The basic astrometric observable of the Space Interferometry Mission (SIM) instrument is the pathlength delay. This measurement is made by a combination of internal metrology measurements that determine the distance the starlight travels through the two arms of the interferometer and a measurement of the white light stellar fringe to find the point of equal pathlength. Because this operation requires a non-negligible integration time, the interferometer baseline vector is not stationary over this time period, as its absolute length and orientation are time-varying. This paper addresses how the time-varying baseline can be “regularized” so that it may act as a single baseline vector for multiple stars, as required for the solution of the astrometric equations.

Type
Section 5. Observational Projects
Information
International Astronomical Union Colloquium , Volume 180: Towards Models and Constants for Sub-Microarcsecond Astrometry , March 2000 , pp. 375 - 379
Copyright
Copyright © US Naval Observatory 2000

References

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Milman, M.H. and Turyshev, S.G., 2000, Observational Model for Precision Astrometry with the Space Interferometry Mission, in Proc. “Interferometry in Optical Astronomy,” Lena, P.J. and Quirrenbach, A., eds., SPIE 4006, paper #99, to be published.Google Scholar