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IERS Message No. 144                                        May 05, 2009
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New Bulletin B




Dear Bulletin B users


Bulletin B made by the IERS EOP Centre is more than 20 years old.
Following a survey which was made recently among the community, we are
proposing a new presentation. The new Bulletin B and its content
description are available on
ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.dat 
and
ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf




It contains:


1 - DAILY FINAL VALUES AND PRELIMINARY VALUES OF x, y, UT1-UTC, dX, dY
and their respective uncertainties. Angular unit is milliarcsecond
(mas), time unit is millisecond (ms). 


2 - DAILY SMOOTHED VALUES OF CELESTIAL POLE OFFSETS (dPsi1980, dEps1980)
with respect to IAU 1980 precession-nutation model and their
uncertainties.


3 - EARTH ANGULAR VELOCITY : DAILY  VALUES OF LOD, OMEGA AT 0hUTC
 LOD   : Excess of the Length of day - 86400 s TAI 
 OMEGA : Earth angular velocity  


4 - INFORMATION ON TIME SCALES: TAI-UTC, leap second announcements


5 - SUMMARY OF CONTRIBUTED EARTH ORIENTATION PARAMETERS SERIES
This section gives statistics in term of formal errors and WRMS of the
combined Technique Centres solutions with respect to the combined
solution as well as individual series. The period covered is that one of
Bulletin B. 




In order to allow users to modify their uploading procedures, the
previous Bulletin B will still be available under its regular
presentation until January 1, 2010 on:
ftp://hpiers.obspm.fr/iers/bul/bulb/bulletinb.dat


Note that in the new version of Bulletin B, C02 and C03 series which
became obsolete are discontinued.


We hope these changes will not bring any disagreement.


If any question or requirements contact: Daniel.gambis@obspm.fr or
Christian.bizouard@obspm.fr.


Best regards


Daniel Gambis and Christian Bizouard




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