Data used:
Files:
Contains: NGA coefficients for the upcoming week (see Documentation)
Updated: Daily
Each day a file of the form EOPPyddd.TXT is produced where y is the last digit of the year and ddd is the day of the year.
Files:
Contains: Observed data (x, y, UT1-UTC, LOD, δΔψ, δΔε), (δX, δY)
Updated: Daily
Files:
Contains: TAI-UTC data
Updated: With new leap seconds
Data documentation can be found at:
Earth Orientation Parameter Prediction Description (NGA Coefficients)
EOP C04 Series
Explanatory Supplement to IERS Bulletins A and B
Note to IERS C04 and Bulletin A users
Process:
NGA coefficients for the coming week are obtained from Source 1.
Observed data is obtained from Source 2.
Predicted data is also obtained from Source 2 and goes out 180 days.
Delta Atomic Time (TAI-UTC)/leap second data is obtained from Source 3.
Keywords:
VERSION major.minor
Provides major and minor version of current data format.
UPDATED yyyy Mon dd hh:mm:ss UTC
Provides UTC date and time of current update.
BEGIN NGA_COEFFICIENTS
END NGA_COEFFICIENTS
Marks beginning and end of NGA coefficients.
NUM_OBSERVED_POINTS number
Indicates number of records of data in the Observed Data section.
BEGIN OBSERVED
END OBSERVED
Marks beginning and end of the Observed Data section.
NUM_PREDICTED_POINTS number
Indicates number of records of data in the Predicted Data section.
BEGIN PREDICTED
END PREDICTED
Marks beginning and end of the Predicted Data section.
Observed and Predicted Data Format:
------------------------------------------------------------------------------------------------------ FORMAT(I4,I3,I3,I6,2F10.6,2F11.7,4F10.6,I4) ------------------------------------------------------------------------------------------------------ Column 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000111 000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999000 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012 ------------------------------------------------------------------------------------------------------ yyyy dd mm MJD x y UT1-UTC LOD dPsi dEpsilon dX dY DAT ------------------------------------------------------------------------------------------------------ yyyy dd mm nnnnn +n.nnnnnn +n.nnnnnn +n.nnnnnnn +n.nnnnnnn +n.nnnnnn +n.nnnnnn +n.nnnnnn +n.nnnnnn nnn ------------------------------------------------------------------------------------------------------ 2000 01 01 51544 0.043251 0.377681 0.3555151 0.0009068 -0.050825 -0.002257 -0.000222 0.000124 32 ------------------------------------------------------------------------------------------------------
Columns | Description |
---|---|
001-004 | Year |
006-007 | Month (01-12) |
009-010 | Day |
012-016 | Modified Julian Date (Julian Date at 0h UT minus 2400000.5) |
018-026 | x (arc seconds) |
028-036 | y (arc seconds) |
038-047 | UT1-UTC (seconds) |
049-058 | Length of Day (seconds) |
060-068 | δΔψ (arc seconds) |
070-078 | δΔε (arc seconds) |
080-088 | δX (arc seconds) |
090-098 | δY (arc seconds) |
100-102 | Delta Atomic Time, TAI-UTC (seconds) |