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Title:
Viking relativity experiment - Verification of signal retardation by solar gravity
Authors:
Reasenberg, R. D.; Shapiro, I. I.; MacNeil, P. E.; Goldstein, R. B.; Breidenthal, J. C.; Brenkle, J. P.; Cain, D. L.; Kaufman, T. M.; Komarek, T. A.; Zygielbaum, A. I.
Affiliation:
AA(MIT, Cambridge, Mass.), AB(MIT, Cambridge, Mass.), AC(MIT, Cambridge, Mass.), AD(MIT, Cambridge, Mass.), AE(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.), AF(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.), AG(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.), AH(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.), AI(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.), AJ(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, Calif.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Dec. 15, 1979, p. L219-L221. (ApJL Homepage)
Publication Date:
12/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Relativistic Effects, Solar Gravitation, Spaceborne Experiments, Viking Spacecraft, Gravitation Theory, Solar System
DOI:
10.1086/183144
Bibliographic Code:
1979ApJ...234L.219R

Abstract

Analysis of 14 months of data obtained from radio ranging to the Viking spacecraft verified, to an estimated accuracy of 0.1%, the prediction of the general theory of relativity that the round-trip times of light signals traveling between the earth and Mars are increased by the direct effect of solar gravity. The corresponding value for the metric parameter gamma is 1.000 plus or minus 0.002, where the quoted uncertainty, twice the formal standard deviation, allows for possible systematic errors.

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