IERS_Auto

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

Bases: astropy.utils.iers.IERS_A

Provide most-recent IERS data and automatically handle downloading of updated values as necessary.

Attributes Summary

iers_table

Cached table, returned if open is called without arguments.

Methods Summary

open()

If the configuration setting astropy.utils.iers.conf.auto_download is set to True (default), then open a recent version of the IERS-A table with predictions for UT1-UTC and polar motion out to approximately one year from now.

Attributes Documentation

iers_table = <IERS_B length=21483>  year month  day    MJD      PM_x   ... e_UT1_UTC  e_LOD   e_dX_2000A e_dY_2000A                      d      arcsec  ...     s        s       arcsec     arcsec   int64 int64 int64 float64  float64  ...  float64  float64   float64    float64   ----- ----- ----- ------- --------- ... --------- -------- ---------- ----------  1962     1     1 37665.0   -0.0127 ...     0.002   0.0014   0.004774      0.002  1962     1     2 37666.0   -0.0159 ...     0.002   0.0014   0.004774      0.002  1962     1     3 37667.0    -0.019 ...     0.002   0.0014   0.004774      0.002  1962     1     4 37668.0 -0.021999 ...     0.002   0.0014   0.004774      0.002  1962     1     5 37669.0 -0.024799 ...     0.002   0.0014   0.004774      0.002  1962     1     6 37670.0 -0.027599 ...     0.002   0.0014   0.004774      0.002  1962     1     7 37671.0 -0.030199 ...     0.002   0.0014   0.004774      0.002  1962     1     8 37672.0 -0.032798 ...     0.002   0.0014   0.004774      0.002  1962     1     9 37673.0 -0.035198 ...     0.002   0.0014   0.004774      0.002   ...   ...   ...     ...       ... ...       ...      ...        ...        ...  2020    10    16 59138.0  0.177883 ...   1.6e-05  1.2e-05   0.000149    0.00016  2020    10    17 59139.0  0.177745 ...  1.61e-05 1.21e-05    0.00015   0.000163  2020    10    18 59140.0  0.177909 ...  1.61e-05 1.21e-05   0.000151   0.000166  2020    10    19 59141.0  0.177206 ...  1.62e-05 1.22e-05   0.000152   0.000169  2020    10    20 59142.0  0.175857 ...  1.63e-05 1.23e-05   0.000153   0.000171  2020    10    21 59143.0  0.174456 ...  1.63e-05 1.23e-05   0.000154   0.000173  2020    10    22 59144.0  0.173277 ...  1.64e-05 1.24e-05   0.000155   0.000174  2020    10    23 59145.0  0.172135 ...  1.64e-05 1.25e-05   0.000156   0.000174  2020    10    24 59146.0     0.171 ...  1.64e-05 1.26e-05   0.000156   0.000175  2020    10    25 59147.0  0.169569 ...  1.65e-05 1.26e-05   0.000157   0.000175

Cached table, returned if open is called without arguments.

Methods Documentation

classmethod open()[source]

If the configuration setting astropy.utils.iers.conf.auto_download is set to True (default), then open a recent version of the IERS-A table with predictions for UT1-UTC and polar motion out to approximately one year from now. If the available version of this file is older than astropy.utils.iers.conf.auto_max_age days old (or non-existent) then it will be downloaded over the network and cached.

If the configuration setting astropy.utils.iers.conf.auto_download is set to False then astropy.utils.iers.IERS() is returned. This is normally the IERS-B table that is supplied with astropy.

On the first call in a session, the table will be memoized (in the iers_table class attribute), and further calls to open will return this stored table.

Returns
QTable instance with IERS (Earth rotation) data columns