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)

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If the package IERS B file (`iers.IERS_B_FILE) is out of date, a new version can be downloaded from iers.IERS_B_URL.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=22601>  year month  day   hour   MJD      PM_x   ... e_dX_2000A e_dY_2000A e_PM_x_dot e_PM_y_dot  e_LOD                              d      arcsec  ...   arcsec     arcsec   arcsec / d arcsec / d    s     int64 int64 int64 int64 float64  float64  ...  float64    float64    float64    float64   float64  ----- ----- ----- ----- ------- --------- ... ---------- ---------- ---------- ---------- --------  1962     1     1     0 37665.0   -0.0127 ...   0.004774      0.002        0.0        0.0   0.0014  1962     1     2     0 37666.0   -0.0159 ...   0.004774      0.002        0.0        0.0   0.0014  1962     1     3     0 37667.0    -0.019 ...   0.004774      0.002        0.0        0.0   0.0014  1962     1     4     0 37668.0 -0.021999 ...   0.004774      0.002        0.0        0.0   0.0014   ...   ...   ...   ...     ...       ... ...        ...        ...        ...        ...      ...  2023    11    13     0 60261.0  0.258249 ...    8.2e-05    8.7e-05    6.5e-05    6.8e-05 3.46e-05  2023    11    14     0 60262.0  0.256507 ...    7.2e-05    6.9e-05    6.7e-05    6.7e-05 3.21e-05  2023    11    15     0 60263.0   0.25457 ...    6.6e-05    6.2e-05    6.9e-05    6.9e-05 2.73e-05  2023    11    16     0 60264.0  0.252424 ...    5.8e-05    5.5e-05    7.6e-05    6.9e-05 2.79e-05  2023    11    17     0 60265.0   0.25038 ...    5.1e-05    4.8e-05    7.7e-05    6.7e-05 2.91e-05

Cached table, returned if open is called without arguments.

Methods Documentation

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.

classmethod read(file=None, readme=None, data_start=6)

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)

Set UT1-UTC source flag for entries in IERS table.