SimGear: mars.cxx Source File

00001 /**************************************************************************
00002  * mars.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: mars_8cxx_source.html,v 1.3 2010/02/23 22:10:14 curt Exp $
00023  **************************************************************************/
00024 
00025 #include <math.h>
00026 
00027 #include "mars.hxx"
00028 
00029 /*************************************************************************
00030  * Mars::Mars(double mjd)
00031  * Public constructor for class Mars
00032  * Argument: The current time.
00033  * the hard coded orbital elements for Mars are passed to 
00034  * CelestialBody::CelestialBody();
00035  ************************************************************************/
00036 Mars::Mars(double mjd) :
00037   CelestialBody(49.55740,  2.1108100E-5,
00038                 1.8497,   -1.78E-8,
00039                 286.5016,  2.9296100E-5,
00040                 1.5236880, 0.000000,
00041                 0.093405,  2.516E-9,
00042                 18.60210,  0.52402077660, mjd)
00043 {
00044 }
00045 Mars::Mars() :
00046   CelestialBody(49.55740,  2.1108100E-5,
00047                 1.8497,   -1.78E-8,
00048                 286.5016,  2.9296100E-5,
00049                 1.5236880, 0.000000,
00050                 0.093405,  2.516E-9,
00051                 18.60210,  0.52402077660)
00052 {
00053 }
00054 /*************************************************************************
00055  * void Mars::updatePosition(double mjd, Star *ourSun)
00056  * 
00057  * calculates the current position of Mars, by calling the base class,
00058  * CelestialBody::updatePosition(); The current magnitude is calculated using 
00059  * a Mars specific equation
00060  *************************************************************************/
00061 void Mars::updatePosition(double mjd, Star *ourSun)
00062 {
00063   CelestialBody::updatePosition(mjd, ourSun);
00064   magnitude = -1.51 + 5*log10( r*R ) + 0.016 * FV;
00065 }