1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*
*+
* 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
* Adapted with permission from the Fortran SLALIB library.
* {enter_further_changes_here}
* Copyright:
* Copyright (C) 1995 Rutherford Appleton Laboratory
* 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 Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
* Bugs:
* {note_any_bugs_here}
*-
*/
#include "pal.h"
#include "pal1sofa.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 */
eraS2c( dsl, dsb, v1 );
/* Supergalactic to galactic */
eraTrxp( rmat, v1, v2 );
/* Cartesian to spherical */
eraC2s( v2, dl, db );
/* Express in conventional ranges */
*dl = eraAnp( *dl );
*db = eraAnpm( *db );
}
|
