Product: EOP 14 C04 (IAU2000A, dX, dY) 0hUTC - one file (1962-now)
EOP 14 C04 series for 1962-2025 (IAU2000) - Version metadata

Available downloads

Content

Earth orientation parameters: x/y pole, UT1-UTC, LOD, dX, dY (smoothed values at 1-day intervals) with respect to IAU 2006/2000A precession-nutation model and consistent with ITRF2014.

EOP 14 C04 is updated two times per week.

Relative to 08 C04, changes in the EOP series from 2011 consist of

1) A small bias in x-pole and y-pole under -50 +/- 25 microarcseconds in the sense of x or y (14 C04) - x or y (08 C04);

2) Small changes in UT1-TAI that are under 5 microseconds; and

3) Small changes in celestial pole offsets that are under 20 microarcseconds.

The data are stored in yearly files since 1962 and in one file 1962-now.
Format

ASCII
Format Description

3(I4),I7,2(F11.6),2(F12.7),2(F11.6),2(F11.6),2(F11.7),2(F12.6)
Documentation

General information: ftp://hpiers.obspm.fr/iers/eop/eopc04/C04.guide.pdf
Information on updates: http://hpiers.obspm.fr/iers/eop/eopc04/updateC04.txt
Publications:
Bizouard, C., Lambert, S., Gattano, C. et al. (2019) The IERS EOP 14C04 solution for Earth orientation parameters consistent with ITRF 2014.
J Geod 93(5):621-633,
https://doi.org/10.1007/s00190-018-1186-3
Title

EOP 14 C04 series for 1962-2025 (IAU2000)
Data

Date [yyyy mm dd], MJD, x ["], y ["], UT1-UTC [s], LOD [s], dX ["], dY ["], x Err ["], y Err ["], UT1-UTC Err [s], LOD Err [s], dX Err ["], dY Err ["]
Data Points

23122
Time Start

1962-01-01
Time End

2025-04-21
Time Interval

1 day
Accuracy 
-                       Min          Max      Average      Average (last 365 days)
sigma_X ["]         0.000021     0.030000     0.006199     0.000032
sigma_Y ["]         0.000016     0.030000     0.006189     0.000024
sigma_UT1-UTC [s]  0.0000011    0.0020000    0.0005581    0.0000078
sigma_LOD [s]      0.0000026    0.0014000    0.0003062    0.0000081
sigma_dX ["]        0.000016     0.004774     0.001061     0.000146
sigma_dY ["]        0.000007     0.002000     0.000749     0.000152
Keywords

EOP, Long term series, 14 C04, IAU 2006/2000A
Frequency

bi-weekly
Source

ftp://hpiers.obspm.fr/iers/eop/eopc04/
Created by

IERS Earth Orientation Centre
Published by

IERS Earth Orientation Centre
Date

2025-05-21
Contact

services.iers@obspm.fr
Distribution

onLine