************************************************************************
IERS Message No. 471                                   February 01, 2023
************************************************************************


Implementation of the IERS 2020 C04 system on 14 February 2023


The IERS will be implementing the 2020 International Terrestrial
Reference Frame (ITRF2020) and making it available in its EOP products
on 14 February 2023. The official IERS 20 C04 final solution will be
available in the usual repertory:

https://hpiers.obspm.fr/iers/eop/eopc04/

(Short description:
https://hpiers.obspm.fr/iers/eop/eopc04_20/eopc04.txt)

The Rapid Service/Prediction Center solution will be available at
https://maia.usno.navy.mil/ser7.

In addition to the alignment with ITRF2020, the C04 series present a
new format given in a shortened header, and include pole rates. The
former version will be produced until June 2023 and put in the repertory
https://hpiers.obspm.fr/iers/eop/eopc04_14/. The yearly series will be
suppressed.

Users are advised to update their data from these sites on 14 February
to ensure that they are fully consistent with the new 20 C04 system. Any
data appearing on these sites before that date should be considered
preliminary.

C. Bizouard, IERS Earth Orientation Center, Paris Observatory
N. Stamatakos, IERS Rapid Service/Prediction Center,
US Naval Observatory


************************************************************************
IERS Messages are edited and distributed by the IERS Central Bureau.
If not stated otherwise, the IERS is only the distributor of the message
and is not responsible for its content.
To submit texts for distribution, please write to
<central_bureau@iers.org>.
To subscribe or unsubscribe, please create an IERS account or modify it:
https://www.iers.org/Login/Login/EN/login_node.html
or write to <central_bureau@iers.org>.
Archives: http://www.iers.org/IERS/Messages
************************************************************************