| 1 | /*
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| 2 | *+
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| 3 | * Name:
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| 4 | * palPm
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| 5 |
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| 6 | * Purpose:
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| 7 | * Apply corrections for proper motion a star RA,Dec
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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 palPm ( double r0, double d0, double pr, double pd,
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| 17 | * double px, double rv, double ep0, double ep1,
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| 18 | * double *r1, double *d1 );
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| 19 |
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| 20 | * Arguments:
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| 21 | * r0 = double (Given)
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| 22 | * RA at epoch ep0 (radians)
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| 23 | * d0 = double (Given)
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| 24 | * Dec at epoch ep0 (radians)
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| 25 | * pr = double (Given)
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| 26 | * RA proper motion in radians per year.
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| 27 | * pd = double (Given)
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| 28 | * Dec proper motion in radians per year.
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| 29 | * px = double (Given)
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| 30 | * Parallax (arcsec)
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| 31 | * rv = double (Given)
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| 32 | * Radial velocity (km/sec +ve if receding)
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| 33 | * ep0 = double (Given)
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| 34 | * Start epoch in years, assumed to be Julian.
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| 35 | * ep1 = double (Given)
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| 36 | * End epoch in years, assumed to be Julian.
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| 37 | * r1 = double * (Returned)
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| 38 | * RA at epoch ep1 (radians)
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| 39 | * d1 = double * (Returned)
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| 40 | * Dec at epoch ep1 (radians)
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| 41 |
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| 42 | * Description:
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| 43 | * Apply corrections for proper motion to a star RA,Dec using the
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| 44 | * SOFA/ERFA routine eraStarpm.
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| 45 |
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| 46 | * Authors:
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| 47 | * TIMJ: Tim Jenness (JAC, Hawaii)
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| 48 | * {enter_new_authors_here}
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| 49 |
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| 50 | * Notes:
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| 51 | * - Uses eraStarpm but ignores the status returns from that routine.
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| 52 | * In particular note that parallax should not be zero when the
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| 53 | * proper motions are non-zero. SLA/F allows parallax to be zero.
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| 54 | * - Assumes all epochs are Julian epochs.
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| 55 |
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| 56 | * History:
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| 57 | * 2012-03-02 (TIMJ):
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| 58 | * Initial version
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| 59 | * Adapted with permission from the Fortran SLALIB library.
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| 60 | * {enter_further_changes_here}
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| 61 |
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| 62 | * Copyright:
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| 63 | * Copyright (C) 2012 Science and Technology Facilities Council.
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| 64 | * All Rights Reserved.
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| 65 |
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| 66 | * Licence:
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| 67 | * This program is free software; you can redistribute it and/or
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| 68 | * modify it under the terms of the GNU General Public License as
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| 69 | * published by the Free Software Foundation; either version 3 of
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| 70 | * the License, or (at your option) any later version.
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| 71 | *
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| 72 | * This program is distributed in the hope that it will be
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| 73 | * useful, but WITHOUT ANY WARRANTY; without even the implied
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| 74 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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| 75 | * PURPOSE. See the GNU General Public License for more details.
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| 76 | *
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| 77 | * You should have received a copy of the GNU General Public License
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| 78 | * along with this program; if not, write to the Free Software
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| 79 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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| 80 | * MA 02110-1301, USA.
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| 81 |
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| 82 | * Bugs:
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| 83 | * {note_any_bugs_here}
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| 84 | *-
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| 85 | */
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| 86 |
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| 87 | #include "pal.h"
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| 88 | #include "pal1sofa.h"
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| 89 |
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| 90 | void palPm ( double r0, double d0, double pr, double pd,
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| 91 | double px, double rv, double ep0, double ep1,
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| 92 | double *r1, double *d1 ) {
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| 93 |
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| 94 | int status;
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| 95 | double ep1a, ep1b, ep2a, ep2b;
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| 96 | double pmr2, pmd2, px2, rv2;
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| 97 |
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| 98 | /* SOFA/ERFA requires the epochs in TDB MJD so we have to
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| 99 | assume that the supplied epochs are Julian years */
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| 100 | eraEpj2jd( ep0, &ep1a, &ep1b );
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| 101 | eraEpj2jd( ep1, &ep2a, &ep2b );
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| 102 |
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| 103 | status = eraStarpm( r0, d0, pr, pd, px, rv,
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| 104 | ep1a, ep1b, ep2a, ep2b,
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| 105 | r1, d1,
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| 106 | &pmr2, &pmd2, &px2, &rv2 );
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| 107 |
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| 108 | }
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