`BulletinA`#

class spacekernel.iers.BulletinA#

Bases: object

IERS Bulletin A

Singleton class providing IERS Bulletin A data with rapid determinations for earth orientation parameters (polar motion, UT1-UTC, LOD, nutation).

BulletinA downloads, parses, caches, and exposes IERS Bulletin A time series. This includes:

Polar motion (pm_x, pm_y), with prediction flags (pm_pred)
UT1‒UTC difference (dut), with prediction flags (dut_pred)
Length-of-day (lod)
Nutation corrections (dX_IAU2000A, dY_IAU2000A), with prediction flags (nutation_pred)

Summary#

Attributes#

BulletinA.url

Properties#

Dates#

`BulletinA.mjd_utc`	Modified Julian Date (UTC)
`BulletinA.jd12_utc`	Julian Date (UTC) in SOFA internal format
`BulletinA.jd12_ut1`	Julian Date (UT1) in SOFA internal format
`BulletinA.mjd_ut1`	Modified Julian Date (UT1)
`BulletinA.date_utc`	Gregorian Date (UTC)

Polar motion#

`BulletinA.pm_pred`	Polar motion prediction flag
`BulletinA.pm_x`	Polar motion x (in radians)
`BulletinA.pm_x_error`	Polar motion x error (in radians)
`BulletinA.pm_y`	Polar motion y (in radians)
`BulletinA.pm_y_error`	Polar motion y error (in radians)

DUT ( = UT1 - UTC)#

`BulletinA.dut_pred`	DUT prediction flag
`BulletinA.dut`	DUT = UT1 - UTC (in seconds)
`BulletinA.dut_error`	DUT error (in seconds)

Length of Day (LOD)#

`BulletinA.lod`	Length of day (LOD) (in seconds)
`BulletinA.lod_error`	LOD error

Nutation#

`BulletinA.nutation_pred`	Nutation prediction flag
`BulletinA.dX_IAU2000A`	Nutation x (in radians)
`BulletinA.dX_IAU2000A_error`	Nutation x error (in radians)
`BulletinA.dY_IAU2000A`	Nutation y (in radians)
`BulletinA.dY_IAU2000A_error`	Nutation y error (in radians)

Methods#

BulletinA.update(cls)

Download and parse the latest IERS Bulletin A data, then cache it.

Members#

property BulletinA.mjd_utc: ndarray[double]#: Modified Julian Date (UTC)

property BulletinA.jd12_utc: ndarray[double]#: Julian Date (UTC) in SOFA internal format

property BulletinA.jd12_ut1: ndarray[double]#: Julian Date (UT1) in SOFA internal format

property BulletinA.mjd_ut1: ndarray[double]#: Modified Julian Date (UT1)

property BulletinA.date_utc: ndarray['datetime64']#: Gregorian Date (UTC)

property BulletinA.pm_pred: ndarray[bint]#: Polar motion prediction flag

property BulletinA.pm_x: ndarray[double]#: Polar motion x (in radians)

property BulletinA.pm_x_error: ndarray[double]#: Polar motion x error (in radians)

property BulletinA.pm_y: ndarray[double]#: Polar motion y (in radians)

property BulletinA.pm_y_error: ndarray[double]#: Polar motion y error (in radians)

property BulletinA.dut_pred: ndarray[bint]#: DUT prediction flag

property BulletinA.dut: ndarray[double]#: DUT = UT1 - UTC (in seconds)

property BulletinA.dut_error: ndarray[double]#: DUT error (in seconds)

property BulletinA.lod: ndarray[double]#: Length of day (LOD) (in seconds)

property BulletinA.lod_error: ndarray[double]#: LOD error

property BulletinA.nutation_pred: ndarray[bint]#: Nutation prediction flag

property BulletinA.dX_IAU2000A: ndarray[double]#: Nutation x (in radians)

property BulletinA.dX_IAU2000A_error: ndarray[double]#: Nutation x error (in radians)

property BulletinA.dY_IAU2000A: ndarray[double]#: Nutation y (in radians)

property BulletinA.dY_IAU2000A_error: ndarray[double]#: Nutation y error (in radians)

BulletinA.url: str = 'https://maia.usno.navy.mil/ser7/finals2000A.daily.extended'#

classmethod BulletinA.update(cls) → None#