PNM06A Subroutine

  1. astro_module.f90
  2. astro_module
  3. PNM06A

public subroutine PNM06A(date1, date2, rnpb)

Form the matrix of precession-nutation for a given date (including frame bias), IAU 2006 precession and IAU 2000A nutation models.

Status: support routine.

Notes

  1. The TT date DATE1+DATE2 is a Julian Date, apportioned in any convenient way between the two arguments. For example, JD(TT)=2450123.7 could be expressed in any of these ways, among others:

        DATE1          DATE2

 2450123.7D0        0D0        (JD method)
  2451545D0      -1421.3D0     (J2000 method)
 2400000.5D0     50123.2D0     (MJD method)
 2450123.5D0       0.2D0       (date & time method)

    The JD method is the most natural and convenient to use in cases where the loss of several decimal digits of resolution is acceptable. The J2000 method is best matched to the way the argument is handled internally and will deliver the optimum resolution. The MJD method and the date & time methods are both good compromises between resolution and convenience.

  2. The matrix operates in the sense V(date) = RNPB * V(GCRS), where the p-vector V(date) is with respect to the true equatorial triad of date DATE1+DATE2 and the p-vector V(GCRS) is with respect to the Geocentric Celestial Reference System (IAU, 2000).

Reference

  • Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855.

History

  • IAU SOFA revision: 2009 December 21

Arguments

TypeIntentOptionalAttributesName
real(kind=wp), intent(in) :: date1

TT as a 2-part Julian Date (Note 1)
real(kind=wp), intent(in) :: date2

TT as a 2-part Julian Date (Note 1)
real(kind=wp), intent(out), dimension(3,3):: rnpb

bias-precession-nutation matrix (Note 2)

Calls

proc~~pnm06a~~CallsGraph proc~pnm06a PNM06A proc~pfw06 PFW06 proc~pnm06a->proc~pfw06 proc~nut06a NUT06A proc~pnm06a->proc~nut06a proc~fw2m FW2M proc~pnm06a->proc~fw2m proc~obl06 OBL06 proc~pfw06->proc~obl06 proc~nut00a NUT00A proc~nut06a->proc~nut00a proc~rx RX proc~fw2m->proc~rx proc~ir IR proc~fw2m->proc~ir proc~rz RZ proc~fw2m->proc~rz proc~faom03 FAOM03 proc~nut00a->proc~faom03 proc~faju03 FAJU03 proc~nut00a->proc~faju03 proc~fasa03 FASA03 proc~nut00a->proc~fasa03 proc~fae03 FAE03 proc~nut00a->proc~fae03 proc~fame03 FAME03 proc~nut00a->proc~fame03 proc~fal03 FAL03 proc~nut00a->proc~fal03 proc~fapa03 FAPA03 proc~nut00a->proc~fapa03 proc~faf03 FAF03 proc~nut00a->proc~faf03 proc~fave03 FAVE03 proc~nut00a->proc~fave03 proc~fama03 FAMA03 proc~nut00a->proc~fama03 proc~faur03 FAUR03 proc~nut00a->proc~faur03

Called by

proc~~pnm06a~~CalledByGraph proc~pnm06a PNM06A proc~gst06a GST06A proc~gst06a->proc~pnm06a proc~s06a S06A proc~s06a->proc~pnm06a proc~xys06a XYS06A proc~xys06a->proc~pnm06a proc~c2i06a C2I06A proc~c2i06a->proc~pnm06a proc~apco13 APCO13 proc~apco13->proc~pnm06a proc~apci13 APCI13 proc~apci13->proc~pnm06a proc~eo06a EO06A proc~eo06a->proc~pnm06a proc~atco13 ATCO13 proc~atco13->proc~apco13 proc~atci13 ATCI13 proc~atci13->proc~apci13 proc~atic13 ATIC13 proc~atic13->proc~apci13 proc~ee06a EE06A proc~ee06a->proc~gst06a proc~c2t06a C2T06A proc~c2t06a->proc~c2i06a proc~atoc13 ATOC13 proc~atoc13->proc~apco13

Contents

Source Code

PNM06A

Source Code

    subroutine PNM06A ( date1, date2, rnpb )

    implicit none

    real(wp),intent(in) :: date1 !! TT as a 2-part Julian Date (Note 1)
    real(wp),intent(in) :: date2 !! TT as a 2-part Julian Date (Note 1)
    real(wp),dimension(3,3),intent(out) :: rnpb !! bias-precession-nutation matrix (Note 2)

    real(wp) :: gamb, phib, psib, epsa, dp, de

    !  Fukushima-Williams angles for frame bias and precession.
    call PFW06 ( date1, date2, gamb, phib, psib, epsa )

    !  Nutation components.
    call NUT06A ( date1, date2, dp, de )

    !  Equinox based nutation x precession x bias matrix.
    call FW2M ( gamb, phib, psib+dp, epsa+de, rnpb )

    end subroutine PNM06A