Examples of how to use asteroid functions.
#include <stdio.h>
#include <libnova/asteroid.h>
#include <libnova/julian_day.h>
#include <libnova/rise_set.h>
#include <libnova/transform.h>
#include <libnova/elliptic_motion.h>
void print_date (
char * title,
struct ln_zonedate* date)
{
printf ("\n%s\n",title);
printf (
" Year : %d\n", date->
years);
printf (
" Month : %d\n", date->
months);
printf (
" Day : %d\n", date->
days);
printf (
" Hours : %d\n", date->
hours);
printf (
" Minutes : %d\n", date->
minutes);
printf (
" Seconds : %f\n", date->
seconds);
}
int main (int argc, char * argv[])
{
double JD, M_JD;
double l,V,dist;
double H, G;
double mag, elong, ph;
char* M_epoch = "K036A";
observer.lat = 55.92;
observer.lng = -3.18;
printf ("JD (sys) %f\n", JD);
orbit.a = 2.7730346;
orbit.e = 0.2299839;
orbit.i = 34.84989;
orbit.omega = 173.16479;
orbit.w = 310.45917;
orbit.n =0.21343771;
H = 4.13;
G = 0.11;
printf ("JD (Perihelion) %f\n", orbit.JD);
printf ("(Geocentric Rect Coords X) for Pallas %f\n", posn.X);
printf ("(Geocentric Rect Coords Y) for Pallas %f\n", posn.Y);
printf ("(Geocentric Rect Coords Z) for Pallas %f\n", posn.Z);
printf ("(Heliocentric Rect Coords X) for Pallas %f\n", posn.X);
printf ("(Heliocentric Rect Coords Y) for Pallas %f\n", posn.Y);
printf ("(Heliocentric Rect Coords Z) for Pallas %f\n", posn.Z);
printf ("(RA) for Pallas %f\n", equ_posn.ra);
printf ("(Dec) for Pallas %f\n", equ_posn.dec);
printf ("Az %f\n",hrz.az);
printf ("Alt %f\n", hrz.alt);
printf ("(Orbit Length) for Pallas in AU %f\n", l);
printf ("(Orbit Perihelion Vel) for Pallas in kms %f\n", V);
printf ("(Orbit Aphelion Vel) for Pallas in kms %f\n", V);
printf ("(Orbit Vel JD) for Pallas in kms %f\n", V);
printf ("Solar Dist (AU) : %f\n", dist);
printf ("Earth Dist (AU) : %f\n", dist);
printf ("Phase angle : %f\n",ph);
printf ("Elongation : %f\n",elong);
mag = ln_get_asteroid_mag (JD, &orbit, H, G);
printf ("Magnitude : %f\n", mag);
printf ("Pallas is circumpolar\n");
else {
ln_get_local_date (rst.rise, &rise);
ln_get_local_date (rst.transit, &transit);
ln_get_local_date (rst.set, &set);
print_date ("Rise", &rise);
print_date ("Transit", &transit);
print_date ("Set", &set);
}
return 0;
}
double ln_get_julian_from_mpc(char *mpc_date)
Calculate the julian day from the a MPC packed date.
Definition: julian_day.c:371
double ln_get_julian_from_sys()
Calculate julian day from system time.
Definition: julian_day.c:249
double ln_get_ell_orbit_avel(struct ln_ell_orbit *orbit)
Calculate the orbital velocity at aphelion in km/s.
Definition: elliptic_motion.c:361
double ln_get_ell_body_solar_dist(double JD, struct ln_ell_orbit *orbit)
Calculate the distance between a body and the Sun.
Definition: elliptic_motion.c:378
double ln_get_ell_last_perihelion(double epoch_JD, double M, double n)
Calculate the julian day of the last perihelion.
Definition: elliptic_motion.c:592
double ln_get_ell_orbit_len(struct ln_ell_orbit *orbit)
Calculate the orbital length in AU.
Definition: elliptic_motion.c:308
void ln_get_ell_geo_rect_posn(struct ln_ell_orbit *orbit, double JD, struct ln_rect_posn *posn)
Calculate the objects rectangular geocentric position.
Definition: elliptic_motion.c:243
double ln_get_ell_body_elong(double JD, struct ln_ell_orbit *orbit)
Calculate the bodies elongation to the Sun..
Definition: elliptic_motion.c:456
void ln_get_ell_helio_rect_posn(struct ln_ell_orbit *orbit, double JD, struct ln_rect_posn *posn)
Calculate the objects rectangular heliocentric position.
Definition: elliptic_motion.c:179
void ln_get_ell_body_equ_coords(double JD, struct ln_ell_orbit *orbit, struct ln_equ_posn *posn)
Calculate a bodies equatorial coords.
Definition: elliptic_motion.c:269
double ln_get_ell_orbit_vel(double JD, struct ln_ell_orbit *orbit)
Calculate orbital velocity in km/s.
Definition: elliptic_motion.c:329
int ln_get_ell_body_rst(double JD, struct ln_lnlat_posn *observer, struct ln_ell_orbit *orbit, struct ln_rst_time *rst)
Calculate the time of rise, set and transit for a body with an elliptic orbit.
Definition: elliptic_motion.c:498
double ln_get_ell_body_phase_angle(double JD, struct ln_ell_orbit *orbit)
Calculate the phase angle of the body. The angle Sun - body - Earth.
Definition: elliptic_motion.c:423
double ln_get_ell_body_earth_dist(double JD, struct ln_ell_orbit *orbit)
Calculate the distance between a body and the Earth.
Definition: elliptic_motion.c:401
double ln_get_ell_orbit_pvel(struct ln_ell_orbit *orbit)
Calculate orbital velocity at perihelion in km/s.
Definition: elliptic_motion.c:346
Elliptic Orbital elements.
Definition: ln_types.h:266
Equatorial Coordinates.
Definition: ln_types.h:171
Horizontal Coordinates.
Definition: ln_types.h:185
Ecliptical (or celestial) Longitude and Latitude.
Definition: ln_types.h:201
Rectangular coordinates.
Definition: ln_types.h:238
Rise, Set and Transit times.
Definition: ln_types.h:318
Human readable Date and time with timezone information used by libnova.
Definition: ln_types.h:87
int minutes
Definition: ln_types.h:92
int months
Definition: ln_types.h:89
int hours
Definition: ln_types.h:91
int years
Definition: ln_types.h:88
int days
Definition: ln_types.h:90
double seconds
Definition: ln_types.h:93