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/*** File libwcs/actread.c
*** January 11, 2001
*** By Doug Mink, dmink@cfa.harvard.edh
*** Harvard-Smithsonian Center for Astrophysics
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "fitsfile.h"
#include "vimoswcs.h"
#include "vimoswcscat.h"
/* pathname of ACT CDROM or catalog search engine URL */
char actcd[64]="/data/act";
static int actreg();
struct StarCat *actopen();
void actclose();
static int actstar();
static int actsize();
static int actsra();
/* ACTREAD -- Read USNO ACT Star Catalog stars from CDROM */
int
actread (cra,cdec,dra,ddec,drad,distsort,sysout,eqout,epout,mag1,mag2,nstarmax,
gnum,gra,gdec,gpra,gpdec,gmag,gmagb,gtype,nlog)
double cra; /* Search center J2000 right ascension in degrees */
double cdec; /* Search center J2000 declination in degrees */
double dra; /* Search half width in right ascension in degrees */
double ddec; /* Search half-width in declination in degrees */
double drad; /* Limiting separation in degrees (ignore if 0) */
int distsort; /* 1 to sort stars by distance from center */
int sysout; /* Search coordinate system */
double eqout; /* Search coordinate equinox */
double epout; /* Proper motion epoch (0.0 for no proper motion) */
double mag1,mag2; /* Limiting magnitudes (none if equal) */
int nstarmax; /* Maximum number of stars to be returned */
double *gnum; /* Array of Guide Star numbers (returned) */
double *gra; /* Array of right ascensions (returned) */
double *gdec; /* Array of declinations (returned) */
double *gpra; /* Array of right ascension proper motions (returned) */
double *gpdec; /* Array of declination proper motions (returned) */
double *gmag; /* Array of visual magnitudes (returned) */
double *gmagb; /* Array of blue magnitudes (returned) */
int *gtype; /* Array of object types (returned) */
int nlog; /* 1 for diagnostics */
{
double ra1,ra2; /* Limiting right ascensions of region in degrees */
double dec1,dec2; /* Limiting declinations of region in degrees */
double dist = 0.0; /* Distance from search center in degrees */
double faintmag=0.0; /* Faintest magnitude */
double maxdist=0.0; /* Largest distance */
int faintstar=0; /* Faintest star */
int farstar=0; /* Most distant star */
double *gdist; /* Array of distances to stars */
int nreg; /* Number of ACT regions in search */
int rlist[100]; /* List of input region files */
int sysref=VIMOSWCS_J2000; /* Catalog coordinate system */
double eqref=2000.0; /* Catalog equinox */
double epref=2000.0; /* Catalog epoch */
struct StarCat *starcat;
struct Star *star;
int verbose;
int wrap;
int rnum, ireg;
int jstar, iw;
int nrmax,nstar,i, ntot;
int istar, istar1, istar2, isp;
double num, ra, dec, rapm, decpm, mag, magb;
double rra1, rra2, rra2a, rdec1, rdec2;
char *str;
char cstr[32];
int nbytes;
ntot = 0;
gdist = NULL;
if (nlog == 1)
verbose = 1;
else
verbose = 0;
/* Set path to ACT Catalog */
if ((str = getenv("ACT_PATH")) != NULL ) {
/* If pathname is a URL, search and return */
if (!strncmp (str, "http:",5)) {
return (webread (str,"act",distsort,cra,cdec,dra,ddec,drad,
sysout,eqout,epout,mag1,mag2,nstarmax,
gnum,gra,gdec,gpra,gpdec,gmag,gmagb,gtype,nlog));
}
}
if (!strncmp (actcd, "http:",5)) {
return (webread (actcd,"act",distsort,cra,cdec,dra,ddec,drad,
sysout,eqout,epout,mag1,mag2,nstarmax,
gnum,gra,gdec,gpra,gpdec,gmag,gmagb,gtype,nlog));
}
vimoswcscstr (cstr, sysout, eqout, epout);
SearchLim (cra, cdec, dra, ddec, sysout, &ra1, &ra2, &dec1, &dec2, verbose);
/* If RA range includes zero, split it in two */
wrap = 0;
if (ra1 > ra2)
wrap = 1;
else
wrap = 0;
/* make mag1 always the smallest magnitude */
if (mag2 < mag1) {
mag = mag2;
mag2 = mag1;
mag1 = mag;
}
/* Allocate table for distances of stars from search center */
if (nstarmax > 10)
nbytes = nstarmax * sizeof (double);
else
nbytes = 10 * sizeof (double);
gdist = (double *) malloc (nbytes);
/* Allocate catalog entry buffer */
star = (struct Star *) calloc (1, sizeof (struct Star));
star->num = 0.0;
nstar = 0;
jstar = 0;
rra1 = ra1;
rra2 = ra2;
rdec1 = dec1;
rdec2 = dec2;
RefLim (cra, cdec, dra, ddec, sysout, sysref, eqout, eqref, epout,
&rra1, &rra2, &rdec1, &rdec2, verbose);
if (rra1 > rra2) {
rra2a = rra2;
rra2 = 360.0;
if (!wrap) wrap = 1;
}
nrmax = 100;
/* If searching through RA = 0:00, split search in two */
for (iw = 0; iw <= wrap; iw++) {
/* Find ACT Star Catalog regions in which to search */
nreg = actreg (rra1,rra2,rdec1,rdec2,nrmax,rlist,verbose);
if (nreg <= 0) {
fprintf (stderr,"ACTREAD: no ACT regions found\n");
free ((void *)gdist);
free ((void *)star);
return (0);
}
/* Loop through region list */
for (ireg = 0; ireg < nreg; ireg++) {
/* Open catalog file for this region */
starcat = actopen (rlist[ireg]);
rnum = rlist[ireg];
/* Set first and last stars to check */
istar1 = actsra (starcat, star, rra1);
istar2 = actsra (starcat, star, rra2);
if (verbose)
fprintf (stderr,"ACTREAD: Searching stars %d.%d through %d.%d\n",
rnum,istar1,rnum,istar2);
/* Loop through catalog for this region */
for (istar = istar1; istar <= istar2; istar++) {
if (actstar (starcat, star, istar)) {
fprintf (stderr,"ACTREAD: Cannot read star %d\n", istar);
break;
}
/* ID number */
num = (double) rlist[ireg] + (star->num / 100000.0);
/* Get position in output coordinate system, equinox, epoch */
rapm = star->rapm;
decpm = star->decpm;
ra = star->ra;
dec = star->dec;
vimoswcsconp (sysref, sysout, eqref, eqout, epref, epout,
&ra, &dec, &rapm, &decpm);
/* Magnitude */
mag = star->xmag[0];
magb = star->xmag[1];
/* Spectral Type */
isp = (1000 * (int) star->isp[0]) + (int)star->isp[1];
/* Compute distance from search center */
if (drad > 0 || distsort)
dist = vimoswcsdist (cra,cdec,ra,dec);
else
dist = 0.0;
/* Check magnitude and position limits */
if ((mag1 == mag2 || (mag >= mag1 && mag <= mag2)) &&
((wrap && (ra <= ra1 || ra >= ra2)) ||
(!wrap && (ra >= ra1 && ra <= ra2))) &&
((drad > 0.0 && dist <= drad) ||
(drad == 0.0 && dec >= dec1 && dec <= dec2))) {
/* Save star position and magnitude in table */
if (nstar < nstarmax) {
gnum[nstar] = num;
gra[nstar] = ra;
gdec[nstar] = dec;
gpra[nstar] = rapm;
gpdec[nstar] = decpm;
gmag[nstar] = mag;
gmagb[nstar] = magb;
gtype[nstar] = isp;
gdist[nstar] = dist;
if (dist > maxdist) {
maxdist = dist;
farstar = nstar;
}
if (mag > faintmag) {
faintmag = mag;
faintstar = nstar;
}
}
/* If too many stars and distance sorting,
replace farthest star */
else if (distsort) {
if (dist < maxdist) {
gnum[farstar] = num;
gra[farstar] = ra;
gdec[farstar] = dec;
gpra[farstar] = rapm;
gpdec[farstar] = decpm;
gmag[farstar] = mag;
gmagb[farstar] = magb;
gtype[farstar] = isp;
gdist[farstar] = dist;
/* Find new farthest star */
maxdist = 0.0;
for (i = 0; i < nstarmax; i++) {
if (gdist[i] > maxdist) {
maxdist = gdist[i];
farstar = i;
}
}
}
}
/* Else if too many stars, replace faintest star */
else if (mag < faintmag) {
gnum[faintstar] = num;
gra[faintstar] = ra;
gdec[faintstar] = dec;
gpra[farstar] = rapm;
gpdec[farstar] = decpm;
gmag[faintstar] = mag;
gmagb[faintstar] = magb;
gtype[faintstar] = isp;
gdist[faintstar] = dist;
faintmag = 0.0;
/* Find new faintest star */
for (i = 0; i < nstarmax; i++) {
if (gmag[i] > faintmag) {
faintmag = gmag[i];
faintstar = i;
}
}
}
nstar++;
if (nlog == 1)
fprintf (stderr,"ACTREAD: %11.6f: %9.5f %9.5f %5.2f %5.2f\n",
num,ra,dec,magb,mag);
/* End of accepted star processing */
}
/* Log operation */
jstar++;
if (nlog > 0 && istar%nlog == 0)
fprintf (stderr,"ACTREAD: %5d / %5d / %5d sources\r",
nstar,jstar,starcat->nstars);
/* End of star loop */
}
ntot = ntot + starcat->nstars;
if (nlog > 0)
fprintf (stderr,"ACTREAD: %4d / %4d: %5d / %5d / %5d sources from region %4d \n",
ireg+1,nreg,nstar,jstar,starcat->nstars,rlist[ireg]);
/* Close region input file */
actclose (starcat);
}
rra1 = 0.0;
rra2 = rra2a;
}
/* close output file and summarize transfer */
if (nlog > 0) {
if (nreg > 1)
fprintf (stderr,"ACTREAD: %d regions: %d / %d found\n",nreg,nstar,ntot);
else
fprintf (stderr,"ACTREAD: 1 region: %d / %d found\n",nstar,ntot);
if (nstar > nstarmax)
fprintf (stderr,"ACTREAD: %d stars found; only %d returned\n",
nstar,nstarmax);
}
free ((void *)star);
free ((void *)gdist);
return (nstar);
}
/* ACTRNUM -- Read HST Guide Star Catalog stars from CDROM */
int
actrnum (nstars,sysout,eqout,epout,
gnum,gra,gdec,gpra,gpdec,gmag,gmagb,gtype,nlog)
int nstars; /* Number of stars to find */
int sysout; /* Search coordinate system */
double eqout; /* Search coordinate equinox */
double epout; /* Proper motion epoch (0.0 for no proper motion) */
double *gnum; /* Array of Guide Star numbers (returned) */
double *gra; /* Array of right ascensions (returned) */
double *gdec; /* Array of declinations (returned) */
double *gpra; /* Array of right ascension proper motions (returned) */
double *gpdec; /* Array of declination proper motions (returned) */
double *gmag; /* Array of V magnitudes (returned) */
double *gmagb; /* Array of B magnitudes (returned) */
int *gtype; /* Array of object types (returned) */
int nlog; /* 1 for diagnostics */
{
int sysref; /* Catalog coordinate system */
double eqref; /* Catalog equinox */
double epref; /* Catalog epoch */
struct StarCat *starcat;
struct Star *star;
int rnum;
int jstar;
int istar, nstar, snum, isp;
double num, ra, dec, rapm, decpm, mag, magb;
char *str;
/* Set path to ACT Catalog */
if ((str = getenv("ACT_PATH")) != NULL ) {
/* If pathname is a URL, search and return */
if (!strncmp (str, "http:",5)) {
return (webrnum (str,"act",nstars, sysout,eqout,epout,
gnum,gra,gdec,gpra,gpdec,gmag,gmagb,gtype,nlog));
}
}
if (!strncmp (actcd, "http:",5)) {
return (webrnum (actcd,"act",nstars, sysout,eqout,epout,
gnum,gra,gdec,gpra,gpdec,gmag,gmagb,gtype,nlog));
}
/* Allocate catalog entry buffer */
star = (struct Star *) calloc (1, sizeof (struct Star));
star->num = 0.0;
nstar = 0;
/* Loop through star list */
for (jstar = 0; jstar < nstars; jstar++) {
rnum = (int) gnum[jstar];
snum = (int) (((gnum[jstar] - (double)rnum) * 100000.0) + 0.01);
/* Open file for this region of ACT catalog */
starcat = actopen (rnum);
if (starcat == NULL) {
free ((void*) star);
return (0);
}
sysref = starcat->coorsys;
eqref = starcat->equinox;
epref = starcat->epoch;
/* Find star in catalog */
istar = snum;
if (actstar (starcat, star, istar)) {
fprintf (stderr,"ACTRNUM: Cannot read star %d\n", istar);
gra[nstar] = 0.0;
gdec[nstar] = 0.0;
gmag[nstar] = 0.0;
gmagb[nstar] = 0.0;
gtype[nstar] = 0;
continue;
}
/* If star has been found in catalog */
/* ID number */
num = star->num;
/* Position in degrees at designated epoch */
ra = star->ra;
dec = star->dec;
rapm = star->rapm;
decpm = star->decpm;
vimoswcsconp (sysref, sysout, eqref, eqout, epref, epout,
&ra, &dec, &rapm, &decpm);
/* Magnitude */
mag = star->xmag[0];
magb = star->xmag[1];
/* Spectral Type */
isp = (1000 * (int) star->isp[0]) + (int)star->isp[1];
/* Save star position and magnitude in table */
gra[nstar] = ra;
gdec[nstar] = dec;
gpra[nstar] = rapm;
gpdec[nstar] = decpm;
gmag[nstar] = mag;
gmagb[nstar] = magb;
gtype[nstar] = isp;
nstar++;
if (nlog == 1)
fprintf (stderr,"ACTRNUM: %11.6f: %9.5f %9.5f %5.2f %5.2f %s \n",
num, ra, dec, magb, mag, star->isp);
/* End of star loop */
}
/* Summarize search */
if (nlog > 0)
fprintf (stderr,"ACTRNUM: %d / %d found\n",nstar,starcat->nstars);
actclose (starcat);
free ((void*) star);
return (nstar);
}
/* ACTREG -- from RA and Dec ranges, figure out which ACT files to search
* Build a list containing the numeric part of the CDROM file names.
*/
static int regions[48]={ 0, 30, 100, 130, 200, 230, 300, 330, 400, 430,
500, 530, 600, 630, 700, 730, 800, 830, 900, 930,
1000,1030,1100,1130,1200,1230,1300,1330,1400,1430,
1500,1530,1600,1630,1700,1730,1800,1830,1900,1930,
2000,2030,2100,2130,2200,2230,2300,2330};
static double reghour[49]={ 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5,
5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5,
10.0,10.5,11.0,11.5,12.0,12.5,13.0,13.5,14.0,14.5,
15.0,15.5,16.0,16.5,17.0,17.5,18.0,18.5,19.0,19.5,
20.0,20.5,21.0,21.5,22.0,22.5,23.0,23.5,24.0};
static int
actreg (ra1, ra2, dec1, dec2, nrmax, rgns, verbose)
double ra1, ra2; /* Right ascension limits in degrees */
double dec1, dec2; /* Declination limits in degrees */
int nrmax; /* Maximum number of regions to find */
int *rgns; /* Region numbers (returned)*/
int verbose; /* 1 for diagnostics */
{
int nsrch; /* Number of regions found (returned) */
int i, ir, irx, ir1, ir2;
/* Zero out regions to be searched */
for (i = 0; i < nrmax; i++)
rgns[i] = 0;
/* Find region range to search based on declination */
/* Find RA regions to search */
ra1 = ra1 / 15.0;
ra2 = ra2 / 15.0;
irx = 0;
/* Find first region to search */
for (ir = 1; ir < 49; ir++) {
if (ra1 >= reghour[ir-1] && ra1 <= reghour[ir]) {
ir1 = ir - 1;
break;
}
}
/* Find last region to search */
for (ir = 1; ir < 49; ir++) {
if (ra2 >= reghour[ir-1] && ra2 <= reghour[ir]) {
ir2 = ir - 1;
break;
}
}
if (ir2 >= ir1) {
for (ir = ir1; ir <= ir2; ir++) {
if (irx < nrmax)
rgns[irx++] = regions[ir];
}
}
else if (ir2 < ir1) {
for (ir = ir1; ir < 48; ir++) {
if (irx < nrmax)
rgns[irx++] = regions[ir];
}
for (ir = 0; ir <= ir2; ir++) {
if (irx < nrmax)
rgns[irx++] = regions[ir];
}
}
nsrch = irx;
if (verbose) {
fprintf (stderr,"ACTREG: RA: %.5f - %.5f, Dec: %.5f - %.5f\n",
ra1,ra2,dec1,dec2);
fprintf (stderr,"ACTREG: searching %d regions:",nsrch);
for (ir = 0; ir < nsrch; ir++)
fprintf (stderr," %04d",rgns[ir]);
fprintf (stderr,"\n");
}
return (nsrch);
}
/* ACTOPEN -- Open ACT catalog region file, returning number of entries */
struct StarCat *
actopen (regnum)
int regnum; /* ACT Catalog region number */
{
FILE *fcat;
struct StarCat *sc;
int lfile, lpath;
char *actfile;
char *path; /* Full pathname for catalog file */
/* static int actsize(); */
char *cdpath;
/* Set the pathname using the appropriate ACT CDROM directory */
if ((cdpath = getenv("ACT_PATH")) == NULL )
cdpath = actcd;
lpath = strlen (cdpath) + 32;
path = (char *) calloc (lpath, 1);
/* Declination zoned regions */
if (regnum > 0 && regnum < 5)
sprintf (path,"%s/data2/act%1d.dat", cdpath, regnum);
/* Right ascension zoned regions */
else
sprintf (path,"%s/data1/act%04d.dat", cdpath, regnum);
/* Find length of ACT catalog region file */
lfile = actsize (path);
/* Check for existence of catalog */
if (lfile < 2) {
fprintf (stderr,"ACTOPEN: Binary catalog %s has no entries\n", path);
free (path);
return (0);
}
/* Open ACT region file */
if (!(fcat = fopen (path, "r"))) {
fprintf (stderr,"ACTOPEN: ACT region file %s cannot be read\n",path);
free (path);
return (0);
}
/* Set ACT catalog header information */
sc = (struct StarCat *) calloc (1, sizeof (struct StarCat));
sc->byteswapped = 0;
sc->nbent = 161;
sc->nstars = lfile / sc->nbent;
/* Separate filename from pathname and save in structure */
actfile = strrchr (path,'/');
if (actfile)
actfile = actfile + 1;
else
actfile = path;
if (strlen (actfile) < 24)
strcpy (sc->isfil, actfile);
else
strncpy (sc->isfil, actfile, 23);
/* Set other catalog information in structure */
sc->inform = 'J';
sc->coorsys = VIMOSWCS_J2000;
sc->epoch = 2000.0;
sc->equinox = 2000.0;
sc->ifcat = fcat;
sc->sptype = 2;
/* ACT region files are all RA-sorted */
sc->rasorted = 1;
return (sc);
}
void
actclose (sc)
struct StarCat *sc; /* Star catalog descriptor */
{
fclose (sc->ifcat);
free ((void *)sc);
return;
}
/* ACTSRA -- Find star closest to given RA in ACT catalog file */
static int
actsra (sc, st, dra)
struct StarCat *sc; /* Star catalog descriptor */
struct Star *st; /* Current star entry */
double dra; /* Right ascension in degrees */
{
char rastr[16], raxstr[16], ramins[16], ramaxs[16];
int istar0, istarx, nrep, ismin, ismax;
double rax, ramin, ramax;
int verbose = 0;
/* Keep RA between 0 and 360 degrees */
if (dra > 360.0)
rax = dra - 360.0;
else
rax = dra;
ismin = 1;
if (actstar (sc, st, ismin)) {
fprintf (stderr,"ACTSRA: Cannot read star %d\n", ismin);
return (0);
}
else
ramin = st->ra;
ismax = sc->nstars;
if (actstar (sc, st, ismax)) {
fprintf (stderr,"ACTSRA: Cannot read star %d\n", ismax);
return (0);
}
else
ramax = st->ra;
istarx = sc->nstars / 2;
for (nrep = 0; nrep < 32; nrep++) {
if (actstar (sc, st, istarx)) {
fprintf (stderr,"ACTSRA: Cannot read star %d\n", istarx);
return (0);
}
/* Find next catalog number to read */
if (st->ra < rax) {
ismin = istarx;
ramin = st->ra;
istar0 = istarx;
if (ismax - istarx > 1)
istarx = istarx + (ismax - istarx) / 2;
else if (ismax - istarx > 0)
istarx = istarx + 1;
}
else if (st->ra > rax) {
ismax = istarx;
ramax = st->ra;
istar0 = istarx;
if (istarx - ismin > 1)
istarx = istarx - ((istarx - ismin) / 2);
else if (istarx - ismin > 0)
istarx = istarx - 1;
}
else
break;
if (verbose) {
ra2str (rastr, 16, st->ra, 3);
ra2str (raxstr, 16, rax, 3);
ra2str (ramins, 16, ramin, 3);
ra2str (ramaxs, 16, ramax, 3);
fprintf (stderr,"%9d: %s -> %s %9d: %s %9d: %s\n",
istarx, rastr, raxstr, ismin,ramins,ismax,ramaxs);
}
if (istarx == istar0)
break;
}
/* Make sure final star is real */
if (actstar (sc, st, istarx)) {
fprintf (stderr,"ACTSRA: Cannot read star %d\n", istarx);
return (0);
}
else
return (istarx);
}
/* ACTSTAR -- Get ACT catalog entry for one star;
return 0 if successful */
static int
actstar (sc, st, istar)
struct StarCat *sc; /* Star catalog descriptor */
struct Star *st; /* Current star entry */
int istar; /* Star sequence number in ACT catalog region file */
{
int nbr;
long offset;
char dsgn;
char line[256];
int irh,irm,idd,idm;
double rs, ds, bvmag;
/* Drop out if catalog pointer is not set */
if (sc == NULL)
return (1);
/* Drop out if catalog is not open */
if (sc->ifcat == NULL)
return (2);
/* Drop out if star number is too large */
if (istar > sc->nstars) {
fprintf (stderr, "ACTSTAR: %d > %d is not in catalog\n",
istar, sc->nstars);
return (3);
}
/* Move file pointer to start of correct star entry */
if (istar > 0) {
offset = (istar - 1) * sc->nbent;
if (fseek (sc->ifcat, offset, SEEK_SET))
return (4);
}
/* Read catalog entry */
if ((nbr = fread (line, sc->nbent, 1, sc->ifcat)) > sc->nbent) {
fprintf (stderr, "ACTSTAR: %d / %d bytes read from %s\n",
nbr, sc->nbent, sc->isfil);
return (5);
}
st->num = (double) istar;
/* Read position for this star */
irh = atoi (line);
irm = atoi (line+3);
rs = atof (line+6);
dsgn = line[14];
idd = atoi (line+15);
idm = atoi (line+18);
ds = atof (line+21);
/* Convert position to degrees */
st->ra = hrdeg ((double)irh + ((double)irm)/60.0 + rs / 3600.0);
st->dec = (double) idd + ((double)idm) / 60.0 + ds / 3600.0;
if (dsgn == '-') st->dec = -st->dec;
/* Read proper motion and convert it to to degrees/year */
st->rapm = hrdeg (atof (line+28)) / 3600.0;
st->decpm = atof (line+36) / 3600.0;
/* Set V, B, B-V magnitudes */
st->xmag[0] = atof (line+75);
st->xmag[1] = atof (line+68);
st->xmag[2] = atof (line+82);
/* Set main sequence spectral type */
bvmag = st->xmag[2];
bv2sp (&bvmag, 0.0, 0.0, st->isp);
return (0);
}
/* ACTSIZE -- return size of one ACT catalog file in bytes */
static int
actsize (filename)
char *filename; /* Name of file for which to find size */
{
FILE *diskfile;
long filesize;
/* Open file */
if ((diskfile = fopen (filename, "r")) == NULL)
return (-1);
/* Move to end of the file */
if (fseek (diskfile, 0, 2) == 0)
/* Position is the size of the file */
filesize = ftell (diskfile);
else
filesize = -1;
fclose (diskfile);
return (filesize);
}
/* Feb 11 1999 New program
* Apr 13 1999 Fix bugs which caused failure on crossing 0:00 h
* May 12 1999 Fix bug for all searches
* May 21 1999 Fix bug with proper motion so it is in deg/yr, not sec/yr
* Jun 16 1999 Use SearchLim()
* Aug 16 1999 Add RefLim() to get converted search coordinates right
* Aug 25 1999 Return real number of stars from actread()
* Sep 16 1999 Fix bug which didn't always return closest stars
* Sep 16 1999 Add distsort argument so brightest stars in circle works, too
* Oct 21 1999 Delete unused varaiables after lint
*
* Jan 5 2000 Add 2 to spectral type string so there can be proper termination
* Mar 15 2000 Add proper motions to returns from actread() and actrnum()
* May 31 2000 Get spectral type from bv2sp()
* Jun 2 2000 Free all allocated data structures
* Jun 9 2000 Fix bug which caused memory overflow if limiting number
* Jun 26 2000 Add coordinate system to SearchLim() arguments
* Sep 25 2000 Set sc->sptype to 2 to indicate presence of spectral type
* Nov 29 2000 Add option to read catalog using HTTP
* Dec 11 2000 Allow catalog search engine URL in actcd[]
*
* Jan 11 2001 All printing is to stderr
*/
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