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Astrometric Interferometry — Can It Establish a Fundamental System?

Published online by Cambridge University Press:  19 July 2016

G. H. Kaplan
G. H. Kaplan*
Affiliation:
U. S. Naval Observatory Washington, D.C. 20392 USA

Abstract

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The astrometric optical interferometer on Mt. Wilson is providing a new source of astrophysical and astrometric data on bright stars. The instrument, with 12-meter baselines, has been in operation since late 1986. The interferometer is capable of wide-angle astrometry, that is, the determination of very precise stellar positions within a reference frame defined by bright stars spread across a large area (of order one steradian) of the sky. This paper addresses the question of whether such an instrument can be used to establish a fundamental system — that is, one tied to the Earth in some well-defined way. Some astrometric data from this instrument are presented to illustrate the difficulties involved. Proposed means of addressing these problems in future instruments are discussed.

Type
Part 3: Concepts, Definitions, Models
Information
Symposium - International Astronomical Union , Volume 141: Inertial Coordinate System on the Sky , 1990 , pp. 241 - 250
Copyright
Copyright © Kluwer 1990 

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