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
|
SUBROUTINE slGE50 (DL, DB, DR, DD)
*+
* - - - - -
* G E 5 0
* - - - - -
*
* Transformation from IAU 1958 galactic coordinates to
* B1950.0 'FK4' equatorial coordinates (double precision)
*
* Given:
* DL,DB dp galactic longitude and latitude L2,B2
*
* Returned:
* DR,DD dp B1950.0 'FK4' RA,Dec
*
* (all arguments are radians)
*
* Called:
* slDS2C, slDIMV, slDC2S, slADET, slDA2P, slDA1P
*
* Note:
* The equatorial coordinates are B1950.0 'FK4'. Use the
* routine slGAEQ if conversion to J2000.0 coordinates
* is required.
*
* Reference:
* Blaauw et al, Mon.Not.R.Astron.Soc.,121,123 (1960)
*
* P.T.Wallace Starlink 5 September 1993
*
* Copyright (C) 1995 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,DR,DD
DOUBLE PRECISION slDA2P,slDA1P
DOUBLE PRECISION V1(3),V2(3),R,D,RE,DE
*
* L2,B2 system of galactic coordinates
*
* P = 192.25 RA of galactic north pole (mean B1950.0)
* Q = 62.6 inclination of galactic to mean B1950.0 equator
* R = 33 longitude of ascending node
*
* P,Q,R are degrees
*
*
* Equatorial to galactic rotation matrix
*
* The Euler angles are P, Q, 90-R, about the z then y then
* z axes.
*
* +CP.CQ.SR-SP.CR +SP.CQ.SR+CP.CR -SQ.SR
*
* -CP.CQ.CR-SP.SR -SP.CQ.CR+CP.SR +SQ.CR
*
* +CP.SQ +SP.SQ +CQ
*
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) /
: -0.066988739415D0,-0.872755765852D0,-0.483538914632D0,
: +0.492728466075D0,-0.450346958020D0,+0.744584633283D0,
: -0.867600811151D0,-0.188374601723D0,+0.460199784784D0 /
* Spherical to Cartesian
CALL slDS2C(DL,DB,V1)
* Rotate to mean B1950.0
CALL slDIMV(RMAT,V1,V2)
* Cartesian to spherical
CALL slDC2S(V2,R,D)
* Introduce E-terms
CALL slADET(R,D,1950D0,RE,DE)
* Express in conventional ranges
DR=slDA2P(RE)
DD=slDA1P(DE)
END
|
