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UranianSatelliteOrbit Class Reference

Inheritance diagram for UranianSatelliteOrbit:

Inheritance graph
Collaboration diagram for UranianSatelliteOrbit:

Collaboration graph
List of all members.

Public Member Functions

Point3d computePosition (double jd) const
double getBoundingRadius () const
double getPeriod () const
 UranianSatelliteOrbit (double _a, double _n, double _L0, double _L1, int _LTerms, int _zTerms, int _zetaTerms, double *_L_k, double *_L_theta, double *_L_phi, double *_z_k, double *_z_theta, double *_z_phi, double *_zeta_k, double *_zeta_theta, double *_zeta_phi)

Private Attributes

double a
double L0
double L1
double * L_k
double * L_phi
double * L_theta
int LTerms
double n
double * z_k
double * z_phi
double * z_theta
double * zeta_k
double * zeta_phi
double * zeta_theta
int zetaTerms
int zTerms

Constructor & Destructor Documentation

UranianSatelliteOrbit::UranianSatelliteOrbit (  double  _a,
double  _n,
double  _L0,
double  _L1,
int  _LTerms,
int  _zTerms,
int  _zetaTerms,
double *  _L_k,
double *  _L_theta,
double *  _L_phi,
double *  _z_k,
double *  _z_theta,
double *  _z_phi,
double *  _zeta_k,
double *  _zeta_theta,
double *  _zeta_phi
)  [inline]
 

Definition at line 2465 of file customorbit.cpp.

02472                                              :
02473         a(_a), n(_n), L0(_L0), L1(_L1),
02474         LTerms(_LTerms), zTerms(_zTerms), zetaTerms(_zetaTerms),
02475         L_k(_L_k), L_theta(_L_theta), L_phi(_L_phi),
02476         z_k(_z_k), z_theta(_z_theta), z_phi(_z_phi),
02477         zeta_k(_zeta_k), zeta_theta(_zeta_theta), zeta_phi(_zeta_phi)
02478     {
02479     };

Member Function Documentation

Point3d UranianSatelliteOrbit::computePosition (  double  jd  )  const [inline, virtual]
 

Implements CachingOrbit.

Definition at line 2494 of file customorbit.cpp.

References cos(), degToRad(), sin(), sqrt(), square(), Matrix3< T >::xrotation(), and Matrix3< T >::yrotation().

02495     {
02496         double t = jd - 2444239.5;
02497         int i;
02498 
02499         double L = L0 + L1 * t;
02500         for (i = 0; i < LTerms; i++)
02501             L += L_k[i] * sin(L_theta[i] * t + L_phi[i]);
02502 
02503         double a0 = 0.0;
02504         double a1 = 0.0;
02505         for (i = 0; i < zTerms; i++)
02506         {
02507             double w = z_theta[i] * t + z_phi[i];
02508             a0 += z_k[i] * cos(w);
02509             a1 += z_k[i] * sin(w);
02510         }
02511 
02512         double b0 = 0.0;
02513         double b1 = 0.0;
02514         for (i = 0; i < zetaTerms; i++)
02515         {
02516             double w = zeta_theta[i] * t + zeta_phi[i];
02517             b0 += zeta_k[i] * cos(w);
02518             b1 += zeta_k[i] * sin(w);
02519         }
02520 
02521         double e = sqrt(square(a0) + square(a1));
02522         double p = atan2(a1, a0);
02523         double gamma = 2.0 * asin(sqrt(square(b0) + square(b1)));
02524         double theta = atan2(b1, b0);
02525 
02526         L += degToRad(174.99);
02527 
02528         // Now that we have all the orbital elements, compute the position
02529         double M = L - p;
02530 
02531         // Iterate a few times to compute the eccentric anomaly from the
02532         // mean anomaly.
02533         double ecc = M;
02534         for (i = 0; i < 4; i++)
02535             ecc = M + e * sin(ecc);
02536 
02537         double x = a * (cos(ecc) - e);
02538         double z = a * sqrt(1 - square(e)) * -sin(ecc);
02539 
02540         Mat3d R = (Mat3d::yrotation(theta) *
02541                    Mat3d::xrotation(gamma) *
02542                    Mat3d::yrotation(p - theta));
02543         return R * Point3d(x, 0, z);
02544     }

double UranianSatelliteOrbit::getBoundingRadius (   )  const [inline, virtual]
 

Implements CachingOrbit.

Definition at line 2487 of file customorbit.cpp.

References BoundingRadiusSlack.

02488     {
02489         // Not quite correct, but should work since e is pretty low
02490         // for most of the Uranian moons.
02491         return a * BoundingRadiusSlack;
02492     }

double UranianSatelliteOrbit::getPeriod (   )  const [inline, virtual]
 

Implements CachingOrbit.

Definition at line 2482 of file customorbit.cpp.

References PI.

02483     {
02484         return 2 * PI / n;
02485     }

Member Data Documentation

double UranianSatelliteOrbit::a [private]
 

Definition at line 2453 of file customorbit.cpp.

double UranianSatelliteOrbit::L0 [private]
 

Definition at line 2455 of file customorbit.cpp.

double UranianSatelliteOrbit::L1 [private]
 

Definition at line 2456 of file customorbit.cpp.

double* UranianSatelliteOrbit::L_k [private]
 

Definition at line 2457 of file customorbit.cpp.

double * UranianSatelliteOrbit::L_phi [private]
 

Definition at line 2457 of file customorbit.cpp.

double * UranianSatelliteOrbit::L_theta [private]
 

Definition at line 2457 of file customorbit.cpp.

int UranianSatelliteOrbit::LTerms [private]
 

Definition at line 2458 of file customorbit.cpp.

double UranianSatelliteOrbit::n [private]
 

Definition at line 2454 of file customorbit.cpp.

double* UranianSatelliteOrbit::z_k [private]
 

Definition at line 2459 of file customorbit.cpp.

double * UranianSatelliteOrbit::z_phi [private]
 

Definition at line 2459 of file customorbit.cpp.

double * UranianSatelliteOrbit::z_theta [private]
 

Definition at line 2459 of file customorbit.cpp.

double* UranianSatelliteOrbit::zeta_k [private]
 

Definition at line 2461 of file customorbit.cpp.

double * UranianSatelliteOrbit::zeta_phi [private]
 

Definition at line 2461 of file customorbit.cpp.

double * UranianSatelliteOrbit::zeta_theta [private]
 

Definition at line 2461 of file customorbit.cpp.

int UranianSatelliteOrbit::zetaTerms [private]
 

Definition at line 2462 of file customorbit.cpp.

int UranianSatelliteOrbit::zTerms [private]
 

Definition at line 2460 of file customorbit.cpp.

The documentation for this class was generated from the following file:
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