kspluto.cpp

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/***************************************************************************
                          kspluto.cpp  -  K Desktop Planetarium
                             -------------------
    begin                : Mon Sep 24 2001
    copyright            : (C) 2001 by Jason Harris
    email                : kstars@30doradus.org
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "kspluto.h"

#include <cmath>

#include <QFile>

#include <kdebug.h>

#include "ksnumbers.h"
#include "kstarsdatetime.h" //for J2000 define

#ifdef B0
// There are systems that #define B0 as a special termios flag (for baud rate)
#undef B0
#endif

KSPluto::KSPluto(const QString &fn, double pSize )
    : KSAsteroid( 0, i18n("Pluto"), fn, J2000,
                  39.48168677, 0.24880766, dms(17.14175), dms(113.76329),
                  dms(110.30347), dms(14.86205), 1.0, 0.0 )
{
    //Initialize the base orbital element values for J2000:
    a0 = 39.48168677; //semi-major axis (AU)
    e0 = 0.24880766;  //eccentricity
    i0.setD( 17.14175 );    //inclination (degrees)
    w0.setD( 113.76329 );   //argument of perihelion (degrees)
    N0.setD( 110.30347 );   //long. of ascending node (degrees)
    M0.setD(  14.86205 );   //mean anomaly (degrees)

    //rate-of-change values for the orbital elements
    a1 = -0.00076912;     // da/dt (AU/cnetury)
    e1 = 0.00006465;      // de/dt (1/century)
    i1 = 11.07/3600.;     // di/dt (degrees/century)
    w1 = -94.92/3600.;   // dw/dt (degrees/century)
    N1 = -37.33/3600.;    // dN/dt (degrees/century)
    M1 = 522880.15/3600.; // dM/dt (degrees/century)

    setPhysicalSize( pSize );
}

KSPluto* KSPluto::clone() const
{
    return new KSPluto(*this);
}

KSPluto::~KSPluto() {
}

//Determine values for the orbital elements for the requested JD, then
//call KSAsteroid::findGeocentricPosition()
bool KSPluto::findGeocentricPosition( const KSNumbers *num, const KSPlanetBase *Earth ) {
    //First, set the orbital element values according to the current epoch
    double t = num->julianCenturies();
    set_a( a0 + a1*t );
    set_e( e0 + e1*t );
    set_i( i0.Degrees() + i1*t );
    set_N( N0.Degrees() + N1*t );
    set_M( M0.Degrees() + M1*t );
    set_P( 365.2568984 * pow((a0+a1*t), 1.5) ); //set period from Kepler's 3rd law
    setJD( num->julianDay() );

    return KSAsteroid::findGeocentricPosition( num, Earth );
}

void KSPluto::findMagnitude(const KSNumbers*)
{
    setMag( -1.01 + 5*log10(rsun() * rearth())  + 0.041*phase().Degrees() );
}