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SUBROUTINE slGASU (DL, DB, DSL, DSB)
*+
* - - - - - - -
* G A S U
* - - - - - - -
*
* Transformation from IAU 1958 galactic coordinates to
* de Vaucouleurs supergalactic coordinates (double precision)
*
* Given:
* DL,DB dp galactic longitude and latitude L2,B2
*
* Returned:
* DSL,DSB dp supergalactic longitude and latitude
*
* (all arguments are radians)
*
* Called:
* slDS2C, slDMXV, slDC2S, slDA2P, slDA1P
*
* References:
*
* 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.)
*
* P.T.Wallace Starlink 25 January 1999
*
* Copyright (C) 1999 Rutherford Appleton Laboratory
*
* License:
* 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 2 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 (see SLA_CONDITIONS); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
*-
IMPLICIT NONE
DOUBLE PRECISION DL,DB,DSL,DSB
DOUBLE PRECISION slDA2P,slDA1P
DOUBLE PRECISION V1(3),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 PRECISION RMAT(3,3)
DATA RMAT(1,1),RMAT(1,2),RMAT(1,3),
: RMAT(2,1),RMAT(2,2),RMAT(2,3),
: RMAT(3,1),RMAT(3,2),RMAT(3,3)/
: -0.735742574804D0,+0.677261296414D0,+0.000000000000D0,
: -0.074553778365D0,-0.080991471307D0,+0.993922590400D0,
: +0.673145302109D0,+0.731271165817D0,+0.110081262225D0/
* Spherical to Cartesian
CALL slDS2C(DL,DB,V1)
* Galactic to supergalactic
CALL slDMXV(RMAT,V1,V2)
* Cartesian to spherical
CALL slDC2S(V2,DSL,DSB)
* Express in conventional ranges
DSL=slDA2P(DSL)
DSB=slDA1P(DSB)
END
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