File Coverage

erfasrc/src/atciqn.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 eraAtciqn(double rc, double dc, double pr, double pd,
4             double px, double rv, eraASTROM *astrom,
5             int n, eraLDBODY b[], double *ri, double *di)
6             /*
7             ** - - - - - - - - - -
8             ** e r a A t c i q n
9             ** - - - - - - - - - -
10             **
11             ** Quick ICRS, epoch J2000.0, to CIRS transformation, given precomputed
12             ** star-independent astrometry parameters plus a list of light-
13             ** deflecting bodies.
14             **
15             ** Use of this function is appropriate when efficiency is important and
16             ** where many star positions are to be transformed for one date. The
17             ** star-independent parameters can be obtained by calling one of the
18             ** functions eraApci[13], eraApcg[13], eraApco[13] or eraApcs[13].
19             **
20             **
21             ** If the only light-deflecting body to be taken into account is the
22             ** Sun, the eraAtciq function can be used instead. If in addition the
23             ** parallax and proper motions are zero, the eraAtciqz function can be
24             ** used.
25             **
26             ** Given:
27             ** rc,dc double ICRS RA,Dec at J2000.0 (radians)
28             ** pr double RA proper motion (radians/year; Note 3)
29             ** pd double Dec proper motion (radians/year)
30             ** px double parallax (arcsec)
31             ** rv double radial velocity (km/s, +ve if receding)
32             ** astrom eraASTROM* star-independent astrometry parameters:
33             ** pmt double PM time interval (SSB, Julian years)
34             ** eb double[3] SSB to observer (vector, au)
35             ** eh double[3] Sun to observer (unit vector)
36             ** em double distance from Sun to observer (au)
37             ** v double[3] barycentric observer velocity (vector, c)
38             ** bm1 double sqrt(1-|v|^2): reciprocal of Lorenz factor
39             ** bpn double[3][3] bias-precession-nutation matrix
40             ** along double longitude + s' (radians)
41             ** xpl double polar motion xp wrt local meridian (radians)
42             ** ypl double polar motion yp wrt local meridian (radians)
43             ** sphi double sine of geodetic latitude
44             ** cphi double cosine of geodetic latitude
45             ** diurab double magnitude of diurnal aberration vector
46             ** eral double "local" Earth rotation angle (radians)
47             ** refa double refraction constant A (radians)
48             ** refb double refraction constant B (radians)
49             ** n int number of bodies (Note 3)
50             ** b eraLDBODY[n] data for each of the n bodies (Notes 3,4):
51             ** bm double mass of the body (solar masses, Note 5)
52             ** dl double deflection limiter (Note 6)
53             ** pv [2][3] barycentric PV of the body (au, au/day)
54             **
55             ** Returned:
56             ** ri,di double CIRS RA,Dec (radians)
57             **
58             ** Notes:
59             **
60             ** 1) Star data for an epoch other than J2000.0 (for example from the
61             ** Hipparcos catalog, which has an epoch of J1991.25) will require a
62             ** preliminary call to eraPmsafe before use.
63             **
64             ** 2) The proper motion in RA is dRA/dt rather than cos(Dec)*dRA/dt.
65             **
66             ** 3) The struct b contains n entries, one for each body to be
67             ** considered. If n = 0, no gravitational light deflection will be
68             ** applied, not even for the Sun.
69             **
70             ** 4) The struct b should include an entry for the Sun as well as for
71             ** any planet or other body to be taken into account. The entries
72             ** should be in the order in which the light passes the body.
73             **
74             ** 5) In the entry in the b struct for body i, the mass parameter
75             ** b[i].bm can, as required, be adjusted in order to allow for such
76             ** effects as quadrupole field.
77             **
78             ** 6) The deflection limiter parameter b[i].dl is phi^2/2, where phi is
79             ** the angular separation (in radians) between star and body at
80             ** which limiting is applied. As phi shrinks below the chosen
81             ** threshold, the deflection is artificially reduced, reaching zero
82             ** for phi = 0. Example values suitable for a terrestrial
83             ** observer, together with masses, are as follows:
84             **
85             ** body i b[i].bm b[i].dl
86             **
87             ** Sun 1.0 6e-6
88             ** Jupiter 0.00095435 3e-9
89             ** Saturn 0.00028574 3e-10
90             **
91             ** 7) For efficiency, validation of the contents of the b array is
92             ** omitted. The supplied masses must be greater than zero, the
93             ** position and velocity vectors must be right, and the deflection
94             ** limiter greater than zero.
95             **
96             ** Called:
97             ** eraPmpx proper motion and parallax
98             ** eraLdn light deflection by n bodies
99             ** eraAb stellar aberration
100             ** eraRxp product of r-matrix and pv-vector
101             ** eraC2s p-vector to spherical
102             ** eraAnp normalize angle into range 0 to 2pi
103             **
104             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
105             ** Derived, with permission, from the SOFA library. See notes at end of file.
106             */
107             {
108             double pco[3], pnat[3], ppr[3], pi[3], w;
109              
110              
111             /* Proper motion and parallax, giving BCRS coordinate direction. */
112 0           eraPmpx(rc, dc, pr, pd, px, rv, astrom->pmt, astrom->eb, pco);
113              
114             /* Light deflection, giving BCRS natural direction. */
115 0           eraLdn(n, b, astrom->eb, pco, pnat);
116              
117             /* Aberration, giving GCRS proper direction. */
118 0           eraAb(pnat, astrom->v, astrom->em, astrom->bm1, ppr);
119              
120             /* Bias-precession-nutation, giving CIRS proper direction. */
121 0           eraRxp(astrom->bpn, ppr, pi);
122              
123             /* CIRS RA,Dec. */
124 0           eraC2s(pi, &w, di);
125 0           *ri = eraAnp(w);
126              
127             /* Finished. */
128              
129 0           }
130             /*----------------------------------------------------------------------
131             **
132             **
133             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
134             ** All rights reserved.
135             **
136             ** This library is derived, with permission, from the International
137             ** Astronomical Union's "Standards of Fundamental Astronomy" library,
138             ** available from http://www.iausofa.org.
139             **
140             ** The ERFA version is intended to retain identical functionality to
141             ** the SOFA library, but made distinct through different function and
142             ** file names, as set out in the SOFA license conditions. The SOFA
143             ** original has a role as a reference standard for the IAU and IERS,
144             ** and consequently redistribution is permitted only in its unaltered
145             ** state. The ERFA version is not subject to this restriction and
146             ** therefore can be included in distributions which do not support the
147             ** concept of "read only" software.
148             **
149             ** Although the intent is to replicate the SOFA API (other than
150             ** replacement of prefix names) and results (with the exception of
151             ** bugs; any that are discovered will be fixed), SOFA is not
152             ** responsible for any errors found in this version of the library.
153             **
154             ** If you wish to acknowledge the SOFA heritage, please acknowledge
155             ** that you are using a library derived from SOFA, rather than SOFA
156             ** itself.
157             **
158             **
159             ** TERMS AND CONDITIONS
160             **
161             ** Redistribution and use in source and binary forms, with or without
162             ** modification, are permitted provided that the following conditions
163             ** are met:
164             **
165             ** 1 Redistributions of source code must retain the above copyright
166             ** notice, this list of conditions and the following disclaimer.
167             **
168             ** 2 Redistributions in binary form must reproduce the above copyright
169             ** notice, this list of conditions and the following disclaimer in
170             ** the documentation and/or other materials provided with the
171             ** distribution.
172             **
173             ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
174             ** the International Astronomical Union nor the names of its
175             ** contributors may be used to endorse or promote products derived
176             ** from this software without specific prior written permission.
177             **
178             ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
179             ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
180             ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
181             ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
182             ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
183             ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
184             ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
185             ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
186             ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
187             ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
188             ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
189             ** POSSIBILITY OF SUCH DAMAGE.
190             **
191             */