Other
Scientific paper
Jun 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gregr...3..135s&link_type=abstract
General Relativity and Gravitation, Volume 3, Issue 1-2, pp. 135-148
Other
5
Scientific paper
Recent results from radar and radio gravity experiments are:
(1)
Retardation of radar signals: 1.02 +-0.05 (planetary radar), 1.00 +- 0.04 (spacecraft);
(2)
Deflection of radio waves: 0.99 +- 0.12 (short baseline interferometry), +0.15 1.04 (short baseline interferometry), -0.10. 0.90 +- 0.05 (short baseline interferometry);
(3)
Relativistic perihelion advance of Mercury: 0.99 +- 0.03 (planetary radar), 1.00 +- 0.01 (radar plus optical);
(4)
Time variation of the gravitational constant: (G/G) < 4 ×10-10/yr (planetary radar). The first three results are expressed as fractions of the corresponding effects predicted by general relativity. In terms of the Eddington-Robertson parameters, the first two are approximately equal to (1+γ)/2 and the third to (2 + 2γ-β)/3. The third result depends on the assumption that the solar gravitational quadrupole moment vanishes; its effects cannot be separated usefully from those of general relativity with the present data set. The uncertainties are as given by the individual experimenters; in some cases they represent formal standard errors, in others an allowance for possible systematic errors is included.
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