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IVS EOP Format, Version 2.1 (last updated: 2009-01-12)

File names ending with .eops contain nutation offsets in dpsi, deps w.r.t. the IAU1980 nutation model while file names ending with .eoxy contain nutation offsets in dX, dY w.r.t. the IAU2006 nutation model (the model should exclude free core nutation).

Files are free format with fields separated by at least one blank.

Format Notation

1 MJD of the measurement (with at least 5 decimal digits)
Earth Orientation
2 x of the pole (arcseconds)
3 y of the pole (arcseconds)
4 UT1-UTC (seconds)
5 dpsi or dX (milliarcseconds)
6 deps or dY (milliarcseconds)
Uncertainty of Earth Orientation and Nutation
7 uncertainty in x (arcseconds)
8 uncertainty in y (arcseconds)
9 uncertainty in UT1-UTC (seconds)
10 uncertainty in dpsi or dX (milliarcseconds)
11 uncertainty in deps or dY (milliarcseconds)
12 wrms residual delay of the session in ps (preferably integer)
13 correlation coefficient: x, y
14 correlation coefficient: x, UT1
15 correlation coefficient: y, UT1
16 correlation coefficient: dpsi/deps or dX/dY
17 number of observables
18 6 character session code according to the 2nd column of IVS master schedules, e.g for 2020: master20.txt
19 span of the observation (in hours)
Rates of Earth Orientation and Nutation
20 x rate of the pole (arcseconds/day)
21 y rate of the pole (arcseconds/day)
22 excess length of day (LOD) (seconds), see comment below
23 dpsi rate (milliarcseconds/day)
24 deps rate (milliarcseconds/day)
Uncertainty of Rates of Earth Orientation and Nutation
25 uncertainty in x rate (arcseconds/day)
26 uncertainty in y rate (arcseconds/day)
27 uncertainty in LOD (s)
28 uncertainty in dpsi rate (milliarcseconds/day)
29 uncertainty in deps rate (milliarcseconds/day)
Configuration of network employed for these Results
30 sequence of two-character IVS station identifiers as maintained in IVS master control file ns-codes.txt (no blanks between stations) e.g. TsWzWfTcGcFt45Oh, TsWzNy or NyTs N.B.: There may be several lines for an individual session identifying different station configurations