| 1 | /*
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| 2 | *+
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| 3 | * Name:
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| 4 | * palPlanet
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| 5 |
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| 6 | * Purpose:
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| 7 | * Approximate heliocentric position and velocity of major planet
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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 palPlanet ( double date, int np, double pv[6], int *j );
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| 17 |
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| 18 | * Arguments:
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| 19 | * date = double (Given)
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| 20 | * TDB Modified Julian Date (JD-2400000.5).
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| 21 | * np = int (Given)
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| 22 | * planet (1=Mercury, 2=Venus, 3=EMB, 4=Mars,
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| 23 | * 5=Jupiter, 6=Saturn, 7=Uranus, 8=Neptune)
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| 24 | * pv = double [6] (Returned)
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| 25 | * heliocentric x,y,z,xdot,ydot,zdot, J2000, equatorial triad
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| 26 | * in units AU and AU/s.
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| 27 | * j = int * (Returned)
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| 28 | * - -2 = solution didn't converge.
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| 29 | * - -1 = illegal np (1-8)
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| 30 | * - 0 = OK
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| 31 | * - +1 = warning: year outside 1000-3000
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| 32 |
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| 33 | * Description:
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| 34 | * Calculates the approximate heliocentric position and velocity of
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| 35 | * the specified major planet.
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| 36 |
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| 37 | * Authors:
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| 38 | * TIMJ: Tim Jenness (JAC, Hawaii)
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| 39 | * {enter_new_authors_here}
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| 40 |
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| 41 | * Notes:
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| 42 | * - See SOFA/ERFA eraPlan94 for details
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| 43 | * - Note that Pluto is supported in SLA/F but not in this routine
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| 44 | * - Status -2 is equivalent to eraPlan94 status +2.
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| 45 | * - Note that velocity units here match the SLA/F documentation.
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| 46 |
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| 47 | * History:
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| 48 | * 2012-03-07 (TIMJ):
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| 49 | * Initial version
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| 50 | * Adapted with permission from the Fortran SLALIB library.
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| 51 | * {enter_further_changes_here}
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| 52 |
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| 53 | * Copyright:
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| 54 | * Copyright (C) 2012 Science and Technology Facilities Council.
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| 55 | * All Rights Reserved.
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| 56 |
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| 57 | * Licence:
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| 58 | * This program is free software; you can redistribute it and/or
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| 59 | * modify it under the terms of the GNU General Public License as
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| 60 | * published by the Free Software Foundation; either version 3 of
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| 61 | * the License, or (at your option) any later version.
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| 62 | *
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| 63 | * This program is distributed in the hope that it will be
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| 64 | * useful, but WITHOUT ANY WARRANTY; without even the implied
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| 65 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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| 66 | * PURPOSE. See the GNU General Public License for more details.
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| 67 | *
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| 68 | * You should have received a copy of the GNU General Public License
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| 69 | * along with this program; if not, write to the Free Software
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| 70 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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| 71 | * MA 02110-1301, USA.
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| 72 |
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| 73 | * Bugs:
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| 74 | * {note_any_bugs_here}
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| 75 | *-
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| 76 | */
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| 77 |
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| 78 | #include "pal.h"
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| 79 | #include "palmac.h"
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| 80 | #include "pal1sofa.h"
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| 81 |
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| 82 | void palPlanet ( double date, int np, double pv[6], int *j ) {
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| 83 | double erapv[2][3];
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| 84 |
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| 85 | *j = eraPlan94( PAL__MJD0, date, np, erapv );
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| 86 |
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| 87 | /* Convert the outputs to the correct form and also correct AU/d
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| 88 | to AU/s */
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| 89 | pv[0] = erapv[0][0];
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| 90 | pv[1] = erapv[0][1];
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| 91 | pv[2] = erapv[0][2];
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| 92 | pv[3] = erapv[1][0] / PAL__SPD;
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| 93 | pv[4] = erapv[1][1] / PAL__SPD;
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| 94 | pv[5] = erapv[1][2] / PAL__SPD;
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| 95 |
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| 96 | /* SLA compatibility for status */
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| 97 | if (*j == 2) *j = -2;
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| 98 |
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| 99 | }
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