| 1 | /*
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| 2 | *+
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| 3 | * Name:
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| 4 | * palSupgal
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| 5 |
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| 6 | * Purpose:
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| 7 | * Convert from supergalactic to galactic coordinates
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| 8 |
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| 9 | * Language:
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| 10 | * Starlink ANSI C
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| 11 |
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| 12 | * Type of Module:
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| 13 | * Library routine
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| 14 |
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| 15 | * Invocation:
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| 16 | * void palSupgal ( double dsl, double dsb, double *dl, double *db );
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| 17 |
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| 18 | * Arguments:
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| 19 | * dsl = double (Given)
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| 20 | * Supergalactic longitude.
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| 21 | * dsb = double (Given)
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| 22 | * Supergalactic latitude.
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| 23 | * dl = double * (Returned)
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| 24 | * Galactic longitude.
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| 25 | * db = double * (Returned)
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| 26 | * Galactic latitude.
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| 27 |
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| 28 | * Description:
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| 29 | * Transformation from de Vaucouleurs supergalactic coordinates
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| 30 | * to IAU 1958 galactic coordinates
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| 31 |
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| 32 | * Authors:
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| 33 | * PTW: Pat Wallace (STFC)
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| 34 | * TIMJ: Tim Jenness (JAC, Hawaii)
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| 35 | * {enter_new_authors_here}
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| 36 |
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| 37 | * See Also:
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| 38 | * - de Vaucouleurs, de Vaucouleurs, & Corwin, Second Reference
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| 39 | * Catalogue of Bright Galaxies, U. Texas, page 8.
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| 40 | * - Systems & Applied Sciences Corp., Documentation for the
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| 41 | * machine-readable version of the above catalogue,
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| 42 | * Contract NAS 5-26490.
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| 43 | *
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| 44 | * (These two references give different values for the galactic
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| 45 | * longitude of the supergalactic origin. Both are wrong; the
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| 46 | * correct value is L2=137.37.)
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| 47 |
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| 48 | * History:
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| 49 | * 2012-02-12(TIMJ):
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| 50 | * Initial version with documentation taken from Fortran SLA
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| 51 | * Adapted with permission from the Fortran SLALIB library.
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| 52 | * {enter_further_changes_here}
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| 53 |
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| 54 | * Copyright:
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| 55 | * Copyright (C) 1995 Rutherford Appleton Laboratory
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| 56 | * Copyright (C) 2012 Science and Technology Facilities Council.
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| 57 | * All Rights Reserved.
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| 58 |
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| 59 | * Licence:
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| 60 | * This program is free software: you can redistribute it and/or
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| 61 | * modify it under the terms of the GNU Lesser General Public
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| 62 | * License as published by the Free Software Foundation, either
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| 63 | * version 3 of the License, or (at your option) any later
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| 64 | * version.
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| 65 | *
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| 66 | * This program is distributed in the hope that it will be useful,
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| 67 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 68 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 69 | * GNU Lesser General Public License for more details.
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| 70 | *
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| 71 | * You should have received a copy of the GNU Lesser General
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| 72 | * License along with this program. If not, see
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| 73 | * <http://www.gnu.org/licenses/>.
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| 74 |
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| 75 | * Bugs:
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| 76 | * {note_any_bugs_here}
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| 77 | *-
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| 78 | */
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| 79 |
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| 80 | #include "pal.h"
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| 81 | #include "pal1sofa.h"
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| 82 |
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| 83 | void palSupgal ( double dsl, double dsb, double *dl, double *db ) {
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| 84 |
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| 85 | double v1[3];
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| 86 | double v2[3];
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| 87 |
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| 88 | /*
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| 89 | * System of supergalactic coordinates:
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| 90 | *
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| 91 | * SGL SGB L2 B2 (deg)
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| 92 | * - +90 47.37 +6.32
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| 93 | * 0 0 - 0
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| 94 | *
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| 95 | * Galactic to supergalactic rotation matrix:
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| 96 | */
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| 97 | double rmat[3][3] = {
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| 98 | { -0.735742574804,+0.677261296414,+0.000000000000 },
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| 99 | { -0.074553778365,-0.080991471307,+0.993922590400 },
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| 100 | { +0.673145302109,+0.731271165817,+0.110081262225 }
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| 101 | };
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| 102 |
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| 103 | /* Spherical to Cartesian */
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| 104 | eraS2c( dsl, dsb, v1 );
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| 105 |
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| 106 | /* Supergalactic to galactic */
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| 107 | eraTrxp( rmat, v1, v2 );
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| 108 |
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| 109 | /* Cartesian to spherical */
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| 110 | eraC2s( v2, dl, db );
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| 111 |
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| 112 | /* Express in conventional ranges */
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| 113 | *dl = eraAnp( *dl );
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| 114 | *db = eraAnpm( *db );
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| 115 |
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| 116 | }
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