Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.0301l&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
At the 2006 International Astronomical Union (IAU) General Assembly (GA), a proposal was adopted to form the Working Group (WG) for Numerical Standards of Fundamental Astronomy. The goal of the WG is to update the "IAU Current Best Estimates" conforming with IAU Resolutions, the International Earth Rotation and Reference Systems Service (IERS) Conventions, and the Système International d'Unités (SI). Changes to the numerical standards have been precipitated by the adoption of a new precession model, the redefinition of Barycentric Dynamical Time (TDB), and the significant improvement of the accuracy of recent estimates for a number of constants. To date, eleven additional constants have been added to the provisional list of Current Best Estimates (CBEs), one has been superseded, one has been removed, and the previous numerical values for ten constants have been replaced by newer values. In addition, the working group has examined larger issues such as identifying the best methods for maintaining an IAU list of CBEs, the best ways of properly documenting the CBE list, and whether a new IAU System of Constants should be recommended to the IAU GA. A significant effort has been expended to ensure that this System of Constants is consistent with the theory of relativity and its terminology. The current status of the activities and anticipated results are presented.
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