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Solar-System Tests of Gravitational TheoriesWe are engaged in testing gravitational theory, primarily using observations of objects in the solar system and primarily on that scale. Our goal is either to detect departures from the standard model (general relativity) - if any exist within the level of sensitivity of our data - or to place tighter bounds on such departures. For this project, we have analyzed a combination of observational data with our model of the solar system, including mostly planetary radar ranging, lunar laser ranging, and spacecraft tracking, but also including both pulsar timing and pulsar very long base interferometry (VLBI) measurements. This year, we have extended our model of Earth nutation with adjustable correction terms at the principal frequencies. We also refined our model of tidal drag on the Moon's orbit. We believe these changes will make no substantial changes in the results, but we are now repeating the analysis of the whole set of data to verify that belief. Additional information is contained in the original extended abstract.
Document ID
20020012425
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor or Grantee Report
Authors
Shapiro, Irwin I.
(Smithsonian Astrophysical Observatory Cambridge, MA United States)
Date Acquired
August 20, 2013
Publication Date
November 1, 2001
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-6832
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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