Global astrometry with OSI

Sacha Loiseau; Fabien Malbet; Jeffrey W. Yu

doi:10.1117/12.212997

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26 June 1995 Global astrometry with OSI

Sacha Loiseau, Fabien Malbet, Jeffrey W. Yu

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Proceedings Volume 2477, Spaceborne Interferometry II; (1995) https://doi.org/10.1117/12.212997
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

We present a method for performing global astrometry with the proposed Orbiting Stellar Interferometer. Because it is dedicated to wide-angle astrometry, OSI has the intrinsic capabilities to achieve global astrometry, even though it doesn't measure directly relative angles between pairs of stars, such as HIPPARCOS. In this paper, a time-independent model is shown, leading to a coherent solution for the positions of reference stars on the whole sky. With an initial measurement accuracy of 10 micro-arcseconds, corresponding to an accuracy of 340 picometers in the knowledge of the delay-line position of the observing interferometer, the consistent least-squares solution gives an accuracy by which the astrometric parameters can be obtained around 2 - 3 micro-arcseconds.

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Sacha Loiseau, Fabien Malbet, and Jeffrey W. Yu "Global astrometry with OSI", Proc. SPIE 2477, Spaceborne Interferometry II, (26 June 1995); https://doi.org/10.1117/12.212997

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