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If the package IERS B file (`iers.IERS_B_FILE) is out of date, a new version can be downloaded from iers.IERS_B_URL.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=22706>  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   ...   ...   ...   ...     ... ...        ...        ...        ...      ...  2024     2    22     0 60362.0 ...    3.8e-05    5.2e-05    5.7e-05 2.06e-05  2024     2    23     0 60363.0 ...    4.1e-05    5.3e-05    5.7e-05 2.08e-05  2024     2    24     0 60364.0 ...    4.1e-05    5.3e-05    5.8e-05 2.11e-05  2024     2    25     0 60365.0 ...    3.8e-05    5.3e-05    5.8e-05 2.13e-05  2024     2    26     0 60366.0 ...    3.6e-05    5.6e-05      6e-05 2.17e-05  2024     2    27     0 60367.0 ...    3.4e-05    5.8e-05    6.1e-05 2.25e-05  2024     2    28     0 60368.0 ...    3.4e-05    6.1e-05    6.5e-05 2.31e-05  2024     2    29     0 60369.0 ...    3.5e-05    6.8e-05      7e-05 2.33e-05  2024     3     1     0 60370.0 ...    3.6e-05    7.3e-05    7.6e-05 2.39e-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.