File Coverage

erfasrc/src/atciqz.c
Criterion Covered Total %
statement 0 8 0.0
branch n/a
condition n/a
subroutine n/a
pod n/a
total 0 8 0.0


line stmt bran cond sub pod time code
1             #include "erfa.h"
2              
3 0           void eraAtciqz(double rc, double dc, eraASTROM *astrom,
4             double *ri, double *di)
5             /*
6             ** - - - - - - - - - -
7             ** e r a A t c i q z
8             ** - - - - - - - - - -
9             **
10             ** Quick ICRS to CIRS transformation, given precomputed star-
11             ** independent astrometry parameters, and assuming zero parallax and
12             ** proper motion.
13             **
14             ** Use of this function is appropriate when efficiency is important and
15             ** where many star positions are to be transformed for one date. The
16             ** star-independent parameters can be obtained by calling one of the
17             ** functions eraApci[13], eraApcg[13], eraApco[13] or eraApcs[13].
18             **
19             ** The corresponding function for the case of non-zero parallax and
20             ** proper motion is eraAtciq.
21             **
22             ** Given:
23             ** rc,dc double ICRS astrometric RA,Dec (radians)
24             ** astrom eraASTROM* star-independent astrometry parameters:
25             ** pmt double PM time interval (SSB, Julian years)
26             ** eb double[3] SSB to observer (vector, au)
27             ** eh double[3] Sun to observer (unit vector)
28             ** em double distance from Sun to observer (au)
29             ** v double[3] barycentric observer velocity (vector, c)
30             ** bm1 double sqrt(1-|v|^2): reciprocal of Lorenz factor
31             ** bpn double[3][3] bias-precession-nutation matrix
32             ** along double longitude + s' (radians)
33             ** xpl double polar motion xp wrt local meridian (radians)
34             ** ypl double polar motion yp wrt local meridian (radians)
35             ** sphi double sine of geodetic latitude
36             ** cphi double cosine of geodetic latitude
37             ** diurab double magnitude of diurnal aberration vector
38             ** eral double "local" Earth rotation angle (radians)
39             ** refa double refraction constant A (radians)
40             ** refb double refraction constant B (radians)
41             **
42             ** Returned:
43             ** ri,di double CIRS RA,Dec (radians)
44             **
45             ** Note:
46             **
47             ** All the vectors are with respect to BCRS axes.
48             **
49             ** References:
50             **
51             ** Urban, S. & Seidelmann, P. K. (eds), Explanatory Supplement to
52             ** the Astronomical Almanac, 3rd ed., University Science Books
53             ** (2013).
54             **
55             ** Klioner, Sergei A., "A practical relativistic model for micro-
56             ** arcsecond astrometry in space", Astr. J. 125, 1580-1597 (2003).
57             **
58             ** Called:
59             ** eraS2c spherical coordinates to unit vector
60             ** eraLdsun light deflection due to Sun
61             ** eraAb stellar aberration
62             ** eraRxp product of r-matrix and p-vector
63             ** eraC2s p-vector to spherical
64             ** eraAnp normalize angle into range +/- pi
65             **
66             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
67             ** Derived, with permission, from the SOFA library. See notes at end of file.
68             */
69             {
70             double pco[3], pnat[3], ppr[3], pi[3], w;
71              
72              
73             /* BCRS coordinate direction (unit vector). */
74 0           eraS2c(rc, dc, pco);
75              
76             /* Light deflection by the Sun, giving BCRS natural direction. */
77 0           eraLdsun(pco, astrom->eh, astrom->em, pnat);
78              
79             /* Aberration, giving GCRS proper direction. */
80 0           eraAb(pnat, astrom->v, astrom->em, astrom->bm1, ppr);
81              
82             /* Bias-precession-nutation, giving CIRS proper direction. */
83 0           eraRxp(astrom->bpn, ppr, pi);
84              
85             /* CIRS RA,Dec. */
86 0           eraC2s(pi, &w, di);
87 0           *ri = eraAnp(w);
88              
89             /* Finished. */
90              
91 0           }
92             /*----------------------------------------------------------------------
93             **
94             **
95             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
96             ** All rights reserved.
97             **
98             ** This library is derived, with permission, from the International
99             ** Astronomical Union's "Standards of Fundamental Astronomy" library,
100             ** available from http://www.iausofa.org.
101             **
102             ** The ERFA version is intended to retain identical functionality to
103             ** the SOFA library, but made distinct through different function and
104             ** file names, as set out in the SOFA license conditions. The SOFA
105             ** original has a role as a reference standard for the IAU and IERS,
106             ** and consequently redistribution is permitted only in its unaltered
107             ** state. The ERFA version is not subject to this restriction and
108             ** therefore can be included in distributions which do not support the
109             ** concept of "read only" software.
110             **
111             ** Although the intent is to replicate the SOFA API (other than
112             ** replacement of prefix names) and results (with the exception of
113             ** bugs; any that are discovered will be fixed), SOFA is not
114             ** responsible for any errors found in this version of the library.
115             **
116             ** If you wish to acknowledge the SOFA heritage, please acknowledge
117             ** that you are using a library derived from SOFA, rather than SOFA
118             ** itself.
119             **
120             **
121             ** TERMS AND CONDITIONS
122             **
123             ** Redistribution and use in source and binary forms, with or without
124             ** modification, are permitted provided that the following conditions
125             ** are met:
126             **
127             ** 1 Redistributions of source code must retain the above copyright
128             ** notice, this list of conditions and the following disclaimer.
129             **
130             ** 2 Redistributions in binary form must reproduce the above copyright
131             ** notice, this list of conditions and the following disclaimer in
132             ** the documentation and/or other materials provided with the
133             ** distribution.
134             **
135             ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
136             ** the International Astronomical Union nor the names of its
137             ** contributors may be used to endorse or promote products derived
138             ** from this software without specific prior written permission.
139             **
140             ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
141             ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
142             ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
143             ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
144             ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
145             ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
146             ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
147             ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
148             ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
149             ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
150             ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
151             ** POSSIBILITY OF SUCH DAMAGE.
152             **
153             */