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Astrometry and Geodesy from VLBI

Published online by Cambridge University Press:  07 August 2017

C. Ma  and
J. L. Russell
C. Ma
Affiliation:
Goddard Space Flight Center Geodynamics Branch Greenbelt, Maryland 20771 USA
J. L. Russell
Affiliation:
Naval Research Laboratory Code 7210 Washington, D.C. 20375-5351 USA

Abstract

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Dual frequency Mark III VLBI observations acquired since 1979 by several geodetic and astrometric observing programs have been used to establish precise celestial and terrestrial reference frames. The program to establish a uniformly distributed celestial reference frame of ∼400 compact radio sources with optical counterparts was begun in 1987. Some 700 sources have been considered as part of this effort and a preliminary list of ∼400 has been observed. At present, 308 sources have formal 1σ errors less than 1 mas in right ascension and 308 have similar precision in declination. The astrometric results include some data acquired for geodetic purposes. The geodetic results using data to September, 1992 include the positions of 105 sites with formal 1σ horizontal errors generally less than 1 cm at 1992.6 and the velocities of 64 sites with formal 1σ horizontal errors generally better than 2 mm/yr.

Type
Very Long Baseline Interferometry (VLBI)
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 159 - 171
Copyright
Copyright © Kluwer 

References

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