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97 lines
2.7 KiB
Fortran
97 lines
2.7 KiB
Fortran
SUBROUTINE sla_SUPGAL (DSL, DSB, DL, DB)
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*+
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* - - - - - - -
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* S U P G A L
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* - - - - - - -
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*
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* Transformation from de Vaucouleurs supergalactic coordinates
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* to IAU 1958 galactic coordinates (double precision)
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*
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* Given:
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* DSL,DSB dp supergalactic longitude and latitude
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*
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* Returned:
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* DL,DB dp galactic longitude and latitude L2,B2
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*
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* (all arguments are radians)
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*
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* Called:
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* sla_DCS2C, sla_DIMXV, sla_DCC2S, sla_DRANRM, sla_DRANGE
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*
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* References:
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*
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* de Vaucouleurs, de Vaucouleurs, & Corwin, Second Reference
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* Catalogue of Bright Galaxies, U. Texas, page 8.
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*
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* Systems & Applied Sciences Corp., Documentation for the
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* machine-readable version of the above catalogue,
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* Contract NAS 5-26490.
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*
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* (These two references give different values for the galactic
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* longitude of the supergalactic origin. Both are wrong; the
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* correct value is L2=137.37.)
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*
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* P.T.Wallace Starlink March 1986
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*
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* Copyright (C) 1995 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 DSL,DSB,DL,DB
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DOUBLE PRECISION sla_DRANRM,sla_DRANGE
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DOUBLE PRECISION V1(3),V2(3)
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*
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* System of supergalactic coordinates:
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*
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* SGL SGB L2 B2 (deg)
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* - +90 47.37 +6.32
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* 0 0 - 0
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*
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* Galactic to supergalactic rotation matrix:
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*
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DOUBLE PRECISION RMAT(3,3)
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DATA RMAT(1,1),RMAT(1,2),RMAT(1,3),
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: RMAT(2,1),RMAT(2,2),RMAT(2,3),
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: RMAT(3,1),RMAT(3,2),RMAT(3,3)/
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: -0.735742574804D0,+0.677261296414D0,+0.000000000000D0,
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: -0.074553778365D0,-0.080991471307D0,+0.993922590400D0,
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: +0.673145302109D0,+0.731271165817D0,+0.110081262225D0/
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* Spherical to Cartesian
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CALL sla_DCS2C(DSL,DSB,V1)
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* Supergalactic to galactic
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CALL sla_DIMXV(RMAT,V1,V2)
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* Cartesian to spherical
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CALL sla_DCC2S(V2,DL,DB)
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* Express in conventional ranges
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DL=sla_DRANRM(DL)
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DB=sla_DRANGE(DB)
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END
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