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IERS Message No. 166 July 05, 2010
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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 21 June 2010, see http://tai.bipm.org/iers/convupdt/convupdt_c1.html.
Added explanatory text on GM values; Corrected typos; Change uncertainty
of GM(sun).
Chapter 5 "Transformation between the International Terrestrial
Reference System and Geocentric Celestial Reference System" has been
updated on 2 July 2010, see
http://tai.bipm.org/iers/convupdt/convupdt_c5.html.
* Sections 5.5.1 and 5.5.3 of the chapter have been revised by
N. Capitaine and A. Brzezinski to include the effects of libration on
the motion of the celestial intermediate pole in the ITRS and the Earth
rotation angle. The subroutine UTLIBR.F has been provided to calculate
the effects on UT1 and LOD.
* The subroutine PMSDNUT2.F replaces the former version PMsdnut.for. It
uses numeric data consistent with that provided in the Chapter Table and
calls the subroutine FUNDARG.F. Differences between PMSDNUT2.F and
PMsdnut.for are at the submicroas level.
* The subroutine fcnnut has been updated by S. Lambert, see
http://syrte.obspm.fr/~lambert/fcn/.
* Correction to Table 5.2e: The sign of the terms in t^4 and in t^5 of
the polynomial part has been corrected. This correction mentioned on 21
October 2009 had not been introduced in the Table (noted by M. Weigelt).
Chapter 8 "Tidal variations in the Earth's rotation" has been updated on
2 July 2010, see http://tai.bipm.org/iers/convupdt/convupdt_c8.html.
Tables 8.3a and 8.3b have been modified so that the number of
significant digits is consistent for all quantities and consistent with
Table 5.1b and the routine provided with Chapter 5.
Chapter 9 "Models for propagation delays" has been updated on
2 July 2010, see http://tai.bipm.org/iers/convupdt/convupdt_c9.html.
Change of notation in equation (37); correction to equation (48) (noted
by O. Colombo).
Gerard Petit and Brian Luzum
IERS Conventions Center
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