Permalink
Find file
Fetching contributors…
Cannot retrieve contributors at this time
97 lines (84 sloc) 2.73 KB
SUBROUTINE sla_GALSUP (DL, DB, DSL, DSB)
*+
* - - - - - - -
* G A L S U P
* - - - - - - -
*
* 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:
* sla_DCS2C, sla_DMXV, sla_DCC2S, sla_DRANRM, sla_DRANGE
*
* 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., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
*-
IMPLICIT NONE
DOUBLE PRECISION DL,DB,DSL,DSB
DOUBLE PRECISION sla_DRANRM,sla_DRANGE
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 sla_DCS2C(DL,DB,V1)
* Galactic to supergalactic
CALL sla_DMXV(RMAT,V1,V2)
* Cartesian to spherical
CALL sla_DCC2S(V2,DSL,DSB)
* Express in conventional ranges
DSL=sla_DRANRM(DSL)
DSB=sla_DRANGE(DSB)
END