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SUBROUTINE sla_SUPGAL (DSL, DSB, DL, DB)
*+
* - - - - - - -
* S U P G A L
* - - - - - - -
*
* Transformation from de Vaucouleurs supergalactic coordinates
* to IAU 1958 galactic coordinates (double precision)
*
* Given:
* DSL,DSB dp supergalactic longitude and latitude
*
* Returned:
* DL,DB dp galactic longitude and latitude L2,B2
*
* (all arguments are radians)
*
* Called:
* sla_DCS2C, sla_DIMXV, 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 March 1986
*
* Copyright (C) 1995 Rutherford Appleton Laboratory
*-
IMPLICIT NONE
DOUBLE PRECISION DSL,DSB,DL,DB
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(DSL,DSB,V1)
* Supergalactic to galactic
CALL sla_DIMXV(RMAT,V1,V2)
* Cartesian to spherical
CALL sla_DCC2S(V2,DL,DB)
* Express in conventional ranges
DL=sla_DRANRM(DL)
DB=sla_DRANGE(DB)
END
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