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Recent Results of Radio Interferometric Determinations of a Transcontinental Baseline, Polar Motion, and Earth Rotation

Published online by Cambridge University Press:  14 August 2015

D. S. Robertson ,
W. E. Carter ,
B. E. Corey ,
W. D. Cotton ,
C. C. Counselman ,
I. I. Shapiro ,
J. J. Wittels ,
H. F. Hinteregger ,
C. A. Knight  and
A. E. E. Rogers
...Show all authors
D. S. Robertson
Affiliation:
National Oceanic and Atmospheric Administration, National Ocean Survey/National Geodetic Survey
W. E. Carter
Affiliation:
National Oceanic and Atmospheric Administration, National Ocean Survey/National Geodetic Survey
B. E. Corey
Affiliation:
Department of Earth and Planetary Sciences and Department of Physics, Massachusetts Institute of Technology
W. D. Cotton
Affiliation:
Department of Earth and Planetary Sciences and Department of Physics, Massachusetts Institute of Technology
C. C. Counselman
Affiliation:
Department of Earth and Planetary Sciences and Department of Physics, Massachusetts Institute of Technology
I. I. Shapiro
Affiliation:
Department of Earth and Planetary Sciences and Department of Physics, Massachusetts Institute of Technology
J. J. Wittels
Affiliation:
Department of Earth and Planetary Sciences and Department of Physics, Massachusetts Institute of Technology
H. F. Hinteregger
Affiliation:
Haystack Observatory
C. A. Knight
Affiliation:
Haystack Observatory
A. E. E. Rogers
Affiliation:
Haystack Observatory
A. R. Whitney
Affiliation:
Haystack Observatory
J. W. Ryan
Affiliation:
National Aeronautics and Space Administration
T. A. Clark
Affiliation:
National Aeronautics and Space Administration
R. J. Coates
Affiliation:
National Aeronautics and Space Administration
C. Ma
Affiliation:
University of Maryland
J. M. Moran
Affiliation:
Smithsonian Astrophysical Observatory

Abstract

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Radio interferometric observations of extragalactic radio sources have been made with antennas at the Haystack Observatory in Massachusetts and the Owens Valley Radio Observatory in California during fourteen separate experiments distributed between September 1976 and May 1978. The components of the baseline vector and the coordinates of the sources were estimated from the data from each experiment separately. The root-weighted-mean-square scatter about the weighted mean (“repeatability”) of the estimates of the length of the 3900 km baseline was approximately 7 cm, and of the source coordinates, approximately or less, except for the declinations of low-declination sources. With the source coordinates all held fixed at the best available, a posteriori, values, and the analyses repeated for each experiment, the repeatability obtained for the estimate of baseline length was 4 cm. From analyses of the data from several experiments simultaneously, estimates were obtained of changes in the x component of pole position and in the Earth's rotation (UT1). Comparison with the corresponding results obtained by the Bureau International de l'Heure (BIH) discloses systematic differences. In particular, the trends in the radio interferometric determinations of the changes in pole position agree more closely with those from the International Polar Motion Service (IPMS) and from the Doppler observations of satellites than with those from the BIH.

Type
Part IV: Radio Interferometry
Information
Symposium - International Astronomical Union , Volume 82: Time and the Earth's Rotation , 1979 , pp. 217 - 224
Copyright
Copyright © Reidel 1979 

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