void palRdplan	(	double	date,
		int	np,
		double	elong,
		double	phi,
		double *	ra,
		double *	dec,
		double *	diam
	)

Definition at line 101 of file palRdplan.c.

References eraAnp(), eraC2s(), eraRxp(), i, PAL__CR, palDmoon(), palDt(), palEpj(), palGmst(), palNut(), palPlanet(), palPrenut(), and palPvobs().

Referenced by PointingModel::CalcPointingPos(), and t_planet().

                                                           {

  /* AU in km */
  const double AUKM = 1.49597870e8;

  /* Equatorial radii (km) */
  const double EQRAU[] = {
    696000.0, /* Sun */
      2439.7,
      6051.9,
      1738,
      3397,
     71492,
     60268,
     25559,
     24764
  };

  /* Local variables */
  int i, j;
  double stl;
  double vgm[6];
  double v[6];
  double rmat[3][3];
  double vse[6];
  double vsg[6];
  double vsp[6];
  double vgo[6];
  double dx,dy,dz,r,tl;

  /* Classify np */
  if (np < 0 || np > 8 ) np=0;  /* Sun */

  /* Approximate local sidereal time */
  stl = palGmst( date - palDt( palEpj(date)) / 86400.0) + elong;

  /* Geocentre to Moon (mean of date) */
  palDmoon( date, v );

  /* Nutation to true of date */
  palNut( date, rmat );
  eraRxp( rmat, v, vgm );
  eraRxp( rmat, &(v[3]), &(vgm[3]) );

  /* Moon? */
  if (np == 3) {

    /* geocentre to Moon (true of date) */
    for (i=0; i<6; i++) {
      v[i] = vgm[i];
    }

  } else {

    /* Not moon: precession/nutation matrix J2000 to date */
    palPrenut( 2000.0, date, rmat );

    /* Sun to Earth-Moon Barycentre (J2000) */
    palPlanet( date, 3, v, &j );

    /* Precession and nutation to date */
    eraRxp( rmat, v, vse );
    eraRxp( rmat, &(v[3]), &(vse[3]) );

    /* Sun to geocentre (true of date) */
    for (i=0; i<6; i++) {
      vsg[i] = vse[i] - 0.012150581 * vgm[i];
    }

    /* Sun ? */
    if (np == 0) {

      /* Geocentre to Sun */
      for (i=0; i<6; i++) {
        v[i] = -vsg[i];
      }

    } else {

      /* Sun to Planet (J2000) */
      palPlanet( date, np, v, &j );

      /* Precession and nutation to date */
      eraRxp( rmat, v, vsp );
      eraRxp( rmat, &(v[3]), &(vsp[3]) );

      /* Geocentre to planet */
      for (i=0; i<6; i++) {
        v[i] = vsp[i] - vsg[i];
      }

    }

  }

  /* Refer to origina at the observer */
  palPvobs( phi, 0.0, stl, vgo );
  for (i=0; i<6; i++) {
    v[i] -= vgo[i];
  }

  /* Geometric distance (AU) */
  dx = v[0];
  dy = v[1];
  dz = v[2];
  r = sqrt( dx*dx + dy*dy + dz*dz );

  /* Light time */
  tl = PAL__CR * r;

  /* Correct position for planetary aberration */
  for (i=0; i<3; i++) {
    v[i] -= tl * v[i+3];
  }

  /* To RA,Dec */
  eraC2s( v, ra, dec );
  *ra = eraAnp( *ra );

  /* Angular diameter (radians) */
  *diam = 2.0 * asin( EQRAU[np] / (r * AUKM ) );

}

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