****************************************************************************** dorismail 09-Apr-2010 17:03:47 Message No 0658 ****************************************************************************** Author: =?iso-8859-1?Q?G=E9rard_Petit?= Subject: updated IERS Conventions Chapters 1 and 3 Author: Gérard Petit (IERS Conventions Center) Information on the updates to the IERS Conventions The IERS Conventions Center informs of the following updates: Chapter 1 "General definitions and numerical standards" has been updated on 9 April 2010, see http://tai.bipm.org/iers/convupdt/convupdt_c1.html. [Note that an interim version was present on 8 April 2010, please update if you happen to have taken it] The section "Numerical standards" has been re-written and the list of constants ensures consistency with the IAU (2009) system of astronomical constants. Chapter 3 "Conventional Dynamical Realization of the ICRS" has been updated on 8 April 2010, see http://tai.bipm.org/iers/convupdt/convupdt_c3.html. The chapter has been re-written (with W.M. Folkner as main contributor) and provides information on recently released ephemerides. When a conventional choice is needed, DE421 is recommended to provide continuity for implementation by users. Gérard Petit and Brian Luzum IERS Conventions Center ---------------------------------------- Gerard Petit Time, frequency and gravimetry department, BIPM Address: Pavillon de Breteuil 92312 Sevres FRANCE Phone: (33)1-45077067 FAX: (33)1-45077059 E-mail: gpetit@bipm.org Please do not reply directly to this message, but send comments and suggestions to IDS.central.bureau@cls.fr