New measurement of solar gravitational deflection of radio signals using VLBI

Details New measurement of solar gravitational deflection of radio signals using VLBI New measurement of solar gravitational deflection of radio signals using VLBI

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.349..768r&link_type=abstract

Nature (ISSN 0028-0836), vol. 349, Feb. 28, 1991, p. 768-770.

Astronomy and Astrophysics

Astronomy

71

Radio Signals, Solar Gravitation, Spaceborne Astronomy, Very Long Base Interferometry, Electromagnetic Radiation, Extragalactic Radio Sources, Solar Limb

Scientific paper

Radio observations using VLBI can measure the deflection of electromagnetic radiation by the sun's gravitational field with an accuracy of better than 1 milliarcsec, and can thus be used to test General Relativity. An analysis is reported here of 10 years of VLBI data, including observations of objects at angles of 2.5-178 deg from the center of the sun. A value of 1.0002 is made for gamma, a parameter whose value is one if General Relativity is correct. This determination is comparable in accuracy and in good agreement with the determination from Mars-Viking time-delay measurements.

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