IERS_B#

class astropy.utils.iers.IERS_B(data=None, masked=False, names=None, dtype=None, meta=None, copy=True, rows=None, copy_indices=True, units=None, descriptions=None, **kwargs)[source]#

Bases: IERS

IERS Table class targeted to IERS B, provided by IERS itself.

These are final values; see https://www.iers.org/IERS/EN/Home/home_node.html

Notes

If the package IERS B file (`iers.IERS_B_FILE) is out of date, a new version can be downloaded from iers.IERS_B_URL.

See read for instructions on how to read a pre-2023 style IERS B file (usually named eopc04_IAU2000.62-now).

Attributes Summary

iers_table

Cached table, returned if open is called without arguments.

Methods Summary

`dcip_source`(i)	Set CIP correction source flag for entries in IERS table.
`pm_source`(i)	Set PM source flag for entries in IERS table.
`read`([file, readme, data_start])	Read IERS-B table from a eopc04.* file provided by IERS.
`ut1_utc_source`(i)	Set UT1-UTC source flag for entries in IERS table.

Attributes Documentation

iers_table = <IERS_B length=22510> year month day hour MJD ... e_dY_2000A e_PM_x_dot e_PM_y_dot e_LOD d ... arcsec arcsec / d arcsec / d s int64 int64 int64 int64 float64 ... float64 float64 float64 float64 ----- ----- ----- ----- ------- ... ---------- ---------- ---------- -------- 1962 1 1 0 37665.0 ... 0.002 0.0 0.0 0.0014 1962 1 2 0 37666.0 ... 0.002 0.0 0.0 0.0014 1962 1 3 0 37667.0 ... 0.002 0.0 0.0 0.0014 1962 1 4 0 37668.0 ... 0.002 0.0 0.0 0.0014 1962 1 5 0 37669.0 ... 0.002 0.0 0.0 0.0014 1962 1 6 0 37670.0 ... 0.002 0.0 0.0 0.0014 1962 1 7 0 37671.0 ... 0.002 0.0 0.0 0.0014 1962 1 8 0 37672.0 ... 0.002 0.0 0.0 0.0014 1962 1 9 0 37673.0 ... 0.002 0.0 0.0 0.0014 ... ... ... ... ... ... ... ... ... ... 2023 8 9 0 60165.0 ... 3.8e-05 8e-05 7.2e-05 2.36e-05 2023 8 10 0 60166.0 ... 4.1e-05 8e-05 7.1e-05 2.4e-05 2023 8 11 0 60167.0 ... 4.4e-05 8.1e-05 7.1e-05 2.42e-05 2023 8 12 0 60168.0 ... 4.8e-05 8.2e-05 7.6e-05 2.45e-05 2023 8 13 0 60169.0 ... 5.7e-05 8.2e-05 7.6e-05 2.41e-05 2023 8 14 0 60170.0 ... 6.7e-05 7.8e-05 7.5e-05 2.35e-05 2023 8 15 0 60171.0 ... 7.4e-05 7.8e-05 7.4e-05 2.39e-05 2023 8 16 0 60172.0 ... 7.3e-05 7.8e-05 7.6e-05 2.45e-05 2023 8 17 0 60173.0 ... 7.1e-05 7.7e-05 7.9e-05 2.49e-05 2023 8 18 0 60174.0 ... 6.8e-05 7.6e-05 7.8e-05 2.56e-05#: Cached table, returned if open is called without arguments.

Methods Documentation

dcip_source(i)[source]#: Set CIP correction source flag for entries in IERS table.

pm_source(i)[source]#: Set PM source flag for entries in IERS table.

classmethod read(file=None, readme=None, data_start=6)[source]#

Read IERS-B table from a eopc04.* file provided by IERS.

Parameters:

filestr: full path to ascii file holding IERS-B data. Defaults to package version, iers.IERS_B_FILE.
readmestr: full path to ascii file holding CDS-style readme. Defaults to package version, iers.IERS_B_README.
data_startint: Starting row. Default is 6, appropriate for standard IERS files.

Returns:

IERS_B class instance

Notes

To read a pre-2023 style IERS B file (usually named something like eopc04_IAU2000.62-now), do something like this example with an excerpt that is used for testing:

>>> from astropy.utils.iers import IERS_B
>>> from astropy.utils.data import get_pkg_data_filename
>>> old_style_file = get_pkg_data_filename(
...     "tests/data/iers_b_old_style_excerpt",
...     package="astropy.utils.iers")
>>> iers_b = IERS_B.read(
...     old_style_file,
...     readme=get_pkg_data_filename("data/ReadMe.eopc04_IAU2000",
...                                  package="astropy.utils.iers"),
...     data_start=14)

ut1_utc_source(i)[source]#: Set UT1-UTC source flag for entries in IERS table.