Very Long Baseline Interferometry (VLBI): Accuracy Limits and Relativistic Tests

Details Very Long Baseline Interferometry (VLBI): Accuracy Limits and Relativistic Tests Very Long Baseline Interferometry (VLBI): Accuracy Limits and Relativistic Tests

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.1502h&link_type=abstract

American Astronomical Society, IAU Symposium #261. Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Ana

Astronomy and Astrophysics

Astronomy

Scientific paper

Measurements with modern space-geodetic techniques are perceptibly affected by relativity: Besides the relativistic implications through reference frame definition and space-time transformations, Very Long Baseline Interferometry (VLBI) allows testing of several relativistic effects, such as the gravitational time delay (`Shapiro effect') and gravito-magnetic effects. In VLBI data analysis it is possible to estimate the cosmological space-curvature parameter γ. This can be done most accurately, if the analysis includes observations taken close to the limb of the major solar system bodies, e. g. Sun or Jupiter. Special observational configurations can be used to determine even higher-order effects of light deflection. There is also a gravitational bending due to the Earth; but this effect is strongly correlated with tropospheric refraction and thus cannot be resolved by Earth-based observations. The paper presents a summary of the relativistic effects of VLBI modelling and analysis, and reviews the accuracy achieved so far.

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