SimGear: venus.cxx Source File

00001 /**************************************************************************
00002  * venus.cxx
00003  * Written by Durk Talsma. Originally started October 1997, for distribution  
00004  * with the FlightGear project. Version 2 was written in August and 
00005  * September 1998. This code is based upon algorithms and data kindly 
00006  * provided by Mr. Paul Schlyter. (pausch@saaf.se). 
00007  *
00008  * This library is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Library General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2 of the License, or (at your option) any later version.
00012  *
00013  * This library is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Library General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU General Public License
00019  * along with this program; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00021  *
00022  * $Id: venus_8cxx_source.html,v 1.3 2010/02/23 22:10:17 curt Exp $
00023  **************************************************************************/
00024 
00025 #include <math.h>
00026 
00027 #include "venus.hxx"
00028 
00029 /*************************************************************************
00030  * Venus::Venus(double mjd)
00031  * Public constructor for class Venus
00032  * Argument: The current time.
00033  * the hard coded orbital elements for Venus are passed to 
00034  * CelestialBody::CelestialBody();
00035  ************************************************************************/
00036 Venus::Venus(double mjd) :
00037   CelestialBody(76.67990,  2.4659000E-5, 
00038                 3.3946,    2.75E-8,
00039                 54.89100,  1.3837400E-5,
00040                 0.7233300, 0.000000,
00041                 0.006773, -1.302E-9,
00042                 48.00520,  1.60213022440, mjd)
00043 {
00044 }
00045 Venus::Venus() :
00046   CelestialBody(76.67990,  2.4659000E-5, 
00047                 3.3946,    2.75E-8,
00048                 54.89100,  1.3837400E-5,
00049                 0.7233300, 0.000000,
00050                 0.006773, -1.302E-9,
00051                 48.00520,  1.60213022440)
00052 {
00053 }
00054 
00055 /*************************************************************************
00056  * void Venus::updatePosition(double mjd, Star *ourSun)
00057  * 
00058  * calculates the current position of Venus, by calling the base class,
00059  * CelestialBody::updatePosition(); The current magnitude is calculated using 
00060  * a Venus specific equation
00061  *************************************************************************/
00062 void Venus::updatePosition(double mjd, Star *ourSun)
00063 {
00064   CelestialBody::updatePosition(mjd, ourSun);
00065   magnitude = -4.34 + 5*log10( r*R ) + 0.013 * FV + 4.2E-07 * pow(FV,3);
00066 }