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85 lines
2.3 KiB
Fortran
85 lines
2.3 KiB
Fortran
SUBROUTINE sla_ADDET (RM, DM, EQ, RC, DC)
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*+
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* - - - - - -
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* A D D E T
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* - - - - - -
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*
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* Add the E-terms (elliptic component of annual aberration)
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* to a pre IAU 1976 mean place to conform to the old
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* catalogue convention (double precision)
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*
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* Given:
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* RM,DM dp RA,Dec (radians) without E-terms
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* EQ dp Besselian epoch of mean equator and equinox
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*
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* Returned:
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* RC,DC dp RA,Dec (radians) with E-terms included
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*
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* Note:
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*
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* Most star positions from pre-1984 optical catalogues (or
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* derived from astrometry using such stars) embody the
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* E-terms. If it is necessary to convert a formal mean
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* place (for example a pulsar timing position) to one
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* consistent with such a star catalogue, then the RA,Dec
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* should be adjusted using this routine.
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*
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* Reference:
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* Explanatory Supplement to the Astronomical Ephemeris,
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* section 2D, page 48.
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*
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* Called: sla_ETRMS, sla_DCS2C, sla_DCC2S, sla_DRANRM, sla_DRANGE
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*
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* P.T.Wallace Starlink 18 March 1999
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*
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* Copyright (C) 1999 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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DOUBLE PRECISION RM,DM,EQ,RC,DC
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DOUBLE PRECISION sla_DRANRM
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DOUBLE PRECISION A(3),V(3)
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INTEGER I
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* E-terms vector
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CALL sla_ETRMS(EQ,A)
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* Spherical to Cartesian
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CALL sla_DCS2C(RM,DM,V)
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* Include the E-terms
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DO I=1,3
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V(I)=V(I)+A(I)
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END DO
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* Cartesian to spherical
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CALL sla_DCC2S(V,RC,DC)
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* Bring RA into conventional range
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RC=sla_DRANRM(RC)
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END
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