Report of the International Astronomical Union Division I Working Group on Precession and the Ecliptic
Abstract
The IAU Working Group on Precession and the Equinox looked at several solutions for replacing the precession part of the IAU 2000A precession nutation model, which is not consistent with dynamical theory. These comparisons show that the (Capitaine et al., Astron. Astrophys., 412, 2003a) precession theory, P03, is both consistent with dynamical theory and the solution most compatible with the IAU 2000A nutation model. Thus, the working group recommends the adoption of the P03 precession theory for use with the IAU 2000A nutation. The two greatest sources of uncertainty in the precession theory are the rate of change of the Earth’s dynamical flattening, ∆J _{2}, and the precession rates (i.e. the constants of integration used in deriving the precession). The combined uncertainties limit the accuracy in the precession theory to approximately 2 mas cent^{2}.
 Publication:

Celestial Mechanics and Dynamical Astronomy
 Pub Date:
 March 2006
 DOI:
 10.1007/s1056900600012
 Bibcode:
 2006CeMDA..94..351H
 Keywords:

 precession and the ecliptic;
 reference systems