Product: EOP C01 IAU1980 (1900-now)
EOP C01 series of the Earth orientation parameters (1900-2025) - Version metadata

Available downloads

Content

EOP(IERS) C 01 is a series of the Earth Orientation Parameters given in the 1997 IERS system at 0.1 year interval (1846 - 1889) and 0.05 year interval (1890 - now).
It is regularly recomputed to take advantage on one hand of the improvement of the various individual contributions and in the other hand of the refinement of the analyses procedures. This series is the basis of the IERS system.
The data are stored in two files: eopc01.1846-1899 and eopc01.1900-'NOW' (this file).
Format

ASCII
Format Description

f10.2,4f10.6,2f11.7,4f10.6
Documentation

http://hpiers.obspm.fr/eoppc/eop/eopc01/EOPC01.GUIDE
Title

EOP C01 series of the Earth orientation parameters (1900-2025)
Data

Year [yyyy.yy], x ["], sigma_x ["], y ["], sigma_y ["], ut1-tai [s], sigma_ut1-tai [s], dPsi ["], sigma_dPsi ["], dEps ["], sigma_dEps ["]
Data Points

2505
Time Start

1900.00
Time End

2025.20
Time Interval

0.05 years
Accuracy 
-             Min        Max    Average    Average (last 365 days)
   sx:    0.000015   0.064563   0.014592   0.000072
   sy:    0.000005   0.048589   0.013214   0.000065
 sut1:   0.000003   99.990000   44.724055   0.000041
sdPsi:   0.000000   0.006903   0.000593   0.000517
sdEps:   0.000000   0.001920   0.000236   0.000216
Keywords

EOP, Long term series, C01, 1900-2025
Frequency

irregular
Source

http://hpiers.obspm.fr/eoppc/eop/eopc01/eopc01.1900-now.dat
Created by

IERS Earth Orientation Centre
Published by

IERS Earth Orientation Centre
Reference

Vondrak J., Ron C., Pesek I., Cepek A., 1995, Astron. and Astrophys. 297, 899-906.
---
IERS Annual reports

Date

2025-04-01
Contact

services.iers@obspm.fr
Distribution

onLine