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/*
*+
* Name:
* palSupgal
* Purpose:
* Convert from supergalactic to galactic coordinates
* Language:
* Starlink ANSI C
* Type of Module:
* Library routine
* Invocation:
* void palSupgal ( double dsl, double dsb, double *dl, double *db );
* Arguments:
* dsl = double (Given)
* Supergalactic longitude.
* dsb = double (Given)
* Supergalactic latitude.
* dl = double * (Returned)
* Galactic longitude.
* db = double * (Returned)
* Galactic latitude.
* Description:
* Transformation from de Vaucouleurs supergalactic coordinates
* to IAU 1958 galactic coordinates
* Authors:
* PTW: Pat Wallace (STFC)
* TIMJ: Tim Jenness (JAC, Hawaii)
* {enter_new_authors_here}
* See Also:
* - de Vaucouleurs, de Vaucouleurs, & Corwin, Second Reference
* Catalogue of Bright Galaxies, U. Texas, page 8.
* - Systems & Applied Sciences Corp., Documentation for the
* machine-readable version of the above catalogue,
* Contract NAS 5-26490.
*
* (These two references give different values for the galactic
* longitude of the supergalactic origin. Both are wrong; the
* correct value is L2=137.37.)
* History:
* 2012-02-12(TIMJ):
* Initial version with documentation taken from Fortran SLA
* {enter_further_changes_here}
* Copyright:
* Copyright (C) 2012 Science and Technology Facilities Council.
* All Rights Reserved.
* Licence:
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA.
* Bugs:
* {note_any_bugs_here}
*-
*/
#include "pal.h"
#include "sofa.h"
void palSupgal ( double dsl, double dsb, double *dl, double *db ) {
double v1[3];
double v2[3];
/*
* System of supergalactic coordinates:
*
* SGL SGB L2 B2 (deg)
* - +90 47.37 +6.32
* 0 0 - 0
*
* Galactic to supergalactic rotation matrix:
*/
double rmat[3][3] = {
{ -0.735742574804,+0.677261296414,+0.000000000000 },
{ -0.074553778365,-0.080991471307,+0.993922590400 },
{ +0.673145302109,+0.731271165817,+0.110081262225 }
};
/* Spherical to Cartesian */
iauS2c( dsl, dsb, v1 );
/* Supergalactic to galactic */
iauTrxp( rmat, v1, v2 );
/* Cartesian to spherical */
iauC2s( v2, dl, db );
/* Express in conventional ranges */
*dl = iauAnp( *dl );
*db = iauAnpm( *db );
}
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