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High Precision Astrometry with Closure Constraints

Published online by Cambridge University Press:  12 April 2016

E. Ros ,
J. M. Marcaide ,
J. C. Guirado ,
M. I. Ratner ,
I. I. Shapiro ,
T. P. Krichbaum ,
A. Witzel  and
R. A. Preston
E. Ros
Affiliation:
Dep. d’Astronomia i Astrofísica, U. de València, E-46100 Burjassot, Spain
J. M. Marcaide
Affiliation:
Dep. d’Astronomia i Astrofísica, U. de València, E-46100 Burjassot, Spain
J. C. Guirado
Affiliation:
Dep. d’Astronomia i Astrofísica, U. de València, E-46100 Burjassot, Spain
M. I. Ratner
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
I. I. Shapiro
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
T. P. Krichbaum
Affiliation:
Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany
A. Witzel
Affiliation:
Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany
R. A. Preston
Affiliation:
Jet Propulsion Laboratory, Caltech, 4800 Oak Grove, Pasadena, CA 91109, USA

Abstract

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We determine the relative separations of the sources in the triangle 1803+784/1928+738/2007+777 with submilliarcsecond accuracy from global 8.4 GHz VLBI observations. We remove the ionospheric contribution to the phase-delay observable using ionospheric total electron content estimates obtained from Global Positioning System (GPS) data. The triangular geometry provides a consistency check through sky closure.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 389 - 390
Copyright
Copyright © Astronomical Society of the Pacific 1998

References

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