void
print_radec(OBSERVATION *obs, FILE *fptr)
{
/* Print out new observation */
/* Now transform to RA/DEC, via ecliptic*/
double ra, dec, lat, lon;
char rastring[20],decstring[20];
void deghms(double degr,
char *outbuff);
void degdms(double degr,
char *outbuff);
proj_to_ec(obs->thetax,obs->thetay,
&lat, &lon,
lat0, lon0, NULL);
ec_to_eq(lat, lon, &ra, &dec, NULL);
ra /= DTOR;
if (ra<0.) ra+= 360.;
dec /= DTOR;
deghms(ra,rastring);
degdms(dec,decstring);
fprintf(fptr,"%.4f %s %s %5.2f %d\n", obs->obstime/DAY + jd0,
rastring,decstring,obs->dthetax/ARCSEC,
obs->obscode);
return;
}
double *predict(char *abg_file, double jdate, int obscode)
{
PBASIS p;
OBSERVATION futobs;
struct date_time dt;
char inbuff[256], rastring[20], decstring[20];
char outbuff[256];
char *f_string;
double **covar,**sigxy,a,b,PA,**derivs;
double lat,lon,**covecl;
double ra,dec, **coveq;
double yr,mo,day,hr,mn,ss;
double xx,yy,xy,bovasqrd,det;
double distance;
static double result[6];
int i,nfields;
int iarg=1;
sigxy = dmatrix(1,2,1,2);
derivs = dmatrix(1,2,1,2);
covar = dmatrix(1,6,1,6);
covecl = dmatrix(1,2,1,2);
coveq = dmatrix(1,2,1,2);
result[0] = -1.0;
result[1] = -1.0;
result[2] = -1.0;
result[3] = -1.0;
result[4] = -1.0;
result[5] = -1.0;
if (read_abg(abg_file,&p,covar) ) {
fprintf(stderr, "Error input alpha/beta/gamma file %s\n",abg_file);
return result;
}
/* get observatory code */
futobs.obscode=obscode;
futobs.obstime=(jdate-jd0)*DAY;
futobs.xe = -999.; /* Force evaluation of earth3d */
distance = predict_posn(&p,covar,&futobs,sigxy);
/* Now transform to RA/DEC, via ecliptic*/
proj_to_ec(futobs.thetax,futobs.thetay,
&lat, &lon,
lat0, lon0, derivs);
/* map the covariance */
covar_map(sigxy, derivs, covecl, 2, 2);
/* Now to ICRS: */
ec_to_eq(lat, lon, &ra, &dec, derivs);
/* map the covariance */
covar_map(covecl, derivs, coveq, 2, 2);
/* Compute a, b, theta of error ellipse for output */
xx = coveq[1][1]*cos(dec)*cos(dec);
xy = coveq[1][2]*cos(dec);
yy = coveq[2][2];
PA = 0.5 * atan2(2.*xy,(xx-yy)) * 180./PI; /*go right to degrees*/
/* Put PA N through E */
PA = 90.-PA;
bovasqrd = (xx+yy-sqrt(pow(xx-yy,2.)+pow(2.*xy,2.)))
/ (xx+yy+sqrt(pow(xx-yy,2.)+pow(2.*xy,2.))) ;
det = xx*yy-xy*xy;
b = pow(det*bovasqrd,0.25);
a = pow(det/bovasqrd,0.25);
ra /= DTOR;
if (ra<0.) ra+= 360.;
dec /= DTOR;
result[0] = ra;
result[1] = dec;
result[2] = a/ARCSEC;
result[3] = b/ARCSEC;
result[4] = PA;
result[5] = distance;
return result;
}
int
main(int argc, char *argv[])
{
PBASIS p;
OBSERVATION futobs;
struct date_time dt;
char inbuff[256],rastring[20],decstring[20];
double **covar,**sigxy,a,b,PA,**derivs;
double lat,lon,**covecl;
double ra,dec, **coveq;
double yr,mo,day,hr,mn,ss;
double xx,yy,xy,bovasqrd,det;
int i,nfields;
int iarg=1;
if (argc>1 && *argv[1]=='^') print_help();
if (read_options(&iarg, argc, argv)) print_help();
if (iarg>=argc) print_help();
/* echo the command line to output */
printf("#");
for (i=0; i<argc; i++) printf(" %s",argv[i]);
{
#include <time.h>
time_t timettt;
time(&timettt);
/* note that ctime returns string with newline at end */
printf("\n#---%s",ctime(&timettt));
}
sigxy = dmatrix(1,2,1,2);
derivs = dmatrix(1,2,1,2);
covar = dmatrix(1,6,1,6);
covecl = dmatrix(1,2,1,2);
coveq = dmatrix(1,2,1,2);
if (read_abg(argv[iarg],&p,covar)) {
fprintf(stderr, "Error input alpha/beta/gamma file %s\n",argv[iarg]);
exit(1);
}
/* get observatory code */
fprintf (stderr,"Enter observatory code:\n");
if (fgets_nocomment(inbuff,255,stdin,NULL)==NULL
|| sscanf(inbuff,"%d",&futobs.obscode)!=1) {
fprintf(stderr,"Error reading observatory code\n");
exit(1);
}
printf("# For observations at site %d\n"
"# x/RA y/DEC "
"err_a err_b err_pa\n",futobs.obscode);
fprintf (stderr,"Enter JD's or Y M D ... of observations, -1 to quit:\n");
while ( fgets_nocomment(inbuff,255,stdin,NULL)!=NULL) {
nfields=sscanf(inbuff,"%lf %lf %lf %lf %lf %lf",
&yr,&mo,&day,&hr,&mn,&ss);
if (nfields==0 ) {
fprintf(stderr,"Error on time spec:\n->%s\n",inbuff);
exit(1);
} else if (yr<0.) {
/*done*/
exit(0);
} else if (nfields==1 || nfields==2) {
/* Got a JD. (probably...)*/
futobs.obstime = (yr-jd0)*DAY;
} else {
dt.y = yr;
dt.mo = mo;
dt.d = day;
if (nfields>=4) dt.h = hr; else dt.h=0.;
if (nfields>=5) dt.mn = mn; else dt.mn=0.;
if (nfields>=6) dt.s = ss; else dt.s=0.;
futobs.obstime = (date_to_jd(dt)-jd0)*DAY;
}
futobs.xe = -999.; /* Force evaluation of earth3d */
printf("At time= %s",inbuff);
predict_posn(&p,covar,&futobs,sigxy);
printf("# Solar Elongation = %.2f Opp angle = %.2f\n",
elongation(&futobs)/DTOR,opposition_angle(&futobs)/DTOR);
/* Compute a, b, theta of error ellipse for output */
xx = sigxy[1][1];
yy = sigxy[2][2];
xy = sigxy[1][2];
PA = 0.5 * atan2(2.*xy,(xx-yy)) * 180./PI; /*go right to degrees*/
/* Adjust for PA to be N through E, */
PA = PA-90;
if (PA<-90.) PA += 180.;
bovasqrd = (xx+yy-sqrt(pow(xx-yy,2.)+pow(2.*xy,2.)))
/ (xx+yy+sqrt(pow(xx-yy,2.)+pow(2.*xy,2.))) ;
det = xx*yy-xy*xy;
b = pow(det*bovasqrd,0.25);
a = pow(det/bovasqrd,0.25);
printf("Cum. ecliptic posn: %10.4f %10.4f %8.2f %8.2f %7.2f\n",
futobs.thetax/ARCSEC, futobs.thetay/ARCSEC,
a/ARCSEC,b/ARCSEC,PA);
/* Now transform to RA/DEC, via ecliptic*/
proj_to_ec(futobs.thetax,futobs.thetay,
&lat, &lon,
lat0, lon0, derivs);
/* map the covariance */
covar_map(sigxy, derivs, covecl, 2, 2);
/* Now to ICRS: */
ec_to_eq(lat, lon, &ra, &dec, derivs);
/* map the covariance */
covar_map(covecl, derivs, coveq, 2, 2);
/* Compute a, b, theta of error ellipse for output */
xx = coveq[1][1]*cos(dec)*cos(dec);
xy = coveq[1][2]*cos(dec);
yy = coveq[2][2];
PA = 0.5 * atan2(2.*xy,(xx-yy)) * 180./PI; /*go right to degrees*/
/* Put PA N through E */
PA = 90.-PA;
bovasqrd = (xx+yy-sqrt(pow(xx-yy,2.)+pow(2.*xy,2.)))
/ (xx+yy+sqrt(pow(xx-yy,2.)+pow(2.*xy,2.))) ;
det = xx*yy-xy*xy;
b = pow(det*bovasqrd,0.25);
a = pow(det/bovasqrd,0.25);
ra /= DTOR;
if (ra<0.) ra+= 360.;
dec /= DTOR;
deghms(ra,rastring);
degdms(dec,decstring);
printf("ICRS position: %s %s %10.4f %10.4f %7.2f\n",
rastring,decstring,a/ARCSEC,b/ARCSEC,PA);
}
exit(0);
}
