BULLETIN B (IAU2000) - Product metadata 

IERS Bulletin B provides current information on the Earth's orientation in the IERS Reference System. This includes Universal Time, coordinates of the terrestrial pole, and celestial pole offsets.
IERS Bulletin B consists of 6 sections:

Section 1:
Five days sampling of section 2 (x, y, UT1R-UTC, UT1R-TAI, dX, dY). Final Bulletin B values over one month and provisional extension over the next three months.

Section 2:
Smoothed values of x, y, UT1-UTC, UT1-UT1R, D, dX, and dY at one-day intervals based on a combination of the series presented in section 6.

Section 3:
Five-day normal values of x, y, UT1-UTC, dX, and dY, and their uncertainties, based on a combination of the series of section 6. New class of robust M-Huber estimators is used in the analysis procedures (Bougeard et al., 2000).

Section 4:
Duration of the day and angular velocity of the earth: Smoothed values of DR and OmegaR, with the same degree of smoothing as UT1R-UTC.

Section 5:
Information on the time scales and announcement of the leap seconds.

Section 6:
Average precision of the individual series contributing to the combination and their agreement with the combination.

ASCII

See contents of the data files or
http://hpiers.obspm.fr/eoppc/bul/bulb/explanatory.html [.rtf]

See contents of the data files and
http://hpiers.obspm.fr/eoppc/bul/bulb/explanatory.html [.rtf]

Section 1: Month [mmm], Day [dd], MJD, x ["], y ["], UT1R-UTC [s], UT1R-TAI [s], dX [0.001"], dY [0.001"]

Section 2: Month [mmm], Day [dd], MJD, x ["], y ["], UT1-UTC [s], UT1-UT1R [ms], D [ms], dX [0.001"], dY [0.001"]

Section 3: Month [mmm], Day [dd], MJD, x ["], y ["], UT1-UTC [s], dX [0.001"], dY [0.001"], and their uncertainties

Section 4: Month [mmm], Day [dd], MJD, DR [s], OmegaR [microrad/s]

Section 5: UTC-TAI [s], DUT1 [s]

Section 6: x [0.001"], y [0.001"], UT1 [0.0001s], D, dX [0.001"], dY [0.001"], Number of points

Cf. http://hpiers.obspm.fr/eoppc/bul/bulb/explanatory.html and contents of the data files.

monthly

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