kspluto.cpp

/*
    SPDX-FileCopyrightText: 2001 Jason Harris <kstars@30doradus.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#include "kspluto.h"
 
#include <typeinfo>
 
#include <cmath>
 
#include <QFile>
 
#include <QDebug>
 
#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, xi18n("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/century)
    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
{
    Q_ASSERT(typeid(this) == typeid(static_cast<const KSPluto *>(this))); // Ensure we are not slicing a derived class
    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());
}