[LEAPSECS] Fwd: IERS Message No. 180 - revised version

[Rob Seaman]

Either someone out there is reading leapsecs - or somebody else is paying attention.  Either way it is a good thing :-)
--

Begin forwarded message:


> From: <central_bureau at iers.org>

> Date: January 7, 2011 8:40:47 AM MST

> To: <messages at iers.org>

> Subject: IERS Message No. 180 - revised version

> 

> Please note: This is a corrected version of IERS Message No. 180

> distributed on January 5, 2011.

> 

> ************************************************************************

> IERS Message No. 180                                    January 07, 2011

> ************************************************************************

> 

> 

> Revision of IERS Earth Rotation Series effective 1 February 2011

> 

> 

> The current series of IERS Earth Orientation Parameters (EOP) provides

> the official transformation between the International Celestial

> Reference Frame (ICRF) and the International Terrestrial Reference Frame

> (ITRF).

> 

> In order to be consistent with the recently released ITRF2008, the IERS

> EOP C04 is being revised. The new solution 08C04 is the reference

> solution starting on 1 February 2011. Relative to 05C04, changes in the

> EOP series consist of

> 

>   1) A negligible bias in x-pole and a bias of about -50 +/- 25

>      microarcseconds in y-pole in the sense of y (08C04) - y (05C04);

> 

>   2) Changes in UT1-TAI and celestial pole offsets are respectively on

>      the order of 2 microseconds, 1, and 17 microarcseconds which are

>      at the level of the WRMS between IVS individual solutions.

> 

> Other IERS EOP series (Bulletin B, C01) will be expressed in this new

> system consistent with ITRF2008 starting with solutions after 1 February

> 2011.

> 

> The Rapid Service/Prediction Center solutions (Bulletin A and daily)

> will be expressed in the new system starting with solutions made on

> 1 February 2011.

> 

> The new version of the C 04 computed in the new system is now called

> IERS 08 C 04.

> 

> IERS 08 C 04 series will be available at:

> ftp://hpiers.obspm.fr/iers/eop/eopc04

> 

> A notice describing its characteristics will be available at:

> ftp://hpiers.obspm.fr/iers/eop/eopc04/C04.guide.pdf

> 

> Past version of C 04 can be downloaded until 30 June 2011 from:

> ftp://hpiers.obspm.fr/iers/eop/eopc04_05/

> 

> 

> Thank you for your cooperation

> 

> D. Gambis, C. Bizouard, Earth Orientation Center,

>     Paris Observatory

> B. Luzum, N. Stamatakos, IERS Rapid Service/Predictions Center,

>     US Naval Observatory

> 

> 

> ************************************************************************

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> please write to <central_bureau at iers.org>.

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> ************************************************************************

>