home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
PC World 1999 April
/
PCWorld_1999-04_cd.bin
/
Software
/
Vyzkuste
/
HomePlan
/
ASTRELEM.C
< prev
next >
Wrap
C/C++ Source or Header
|
1994-11-06
|
6KB
|
221 lines
/*
Convert asteroid elements in the 8-line format used
by the Minor Planet Center (and in the Minor Planet
Electronic Circulars) to our CSV format.
Designed and implemented by John Walker in October of 1994.
(4646) Kwee
Epoch 1993 Jan. 13.0 TT = JDT 2449000.5 (M-P) Oishi
M 220.20030 (2000.0) P Q
n 0.26003234 Peri. 350.28914 +0.79481320 +0.60665475
a 2.4309973 Node 332.34432 -0.55450494 +0.71559595
e 0.1921938 Incl. 1.92064 -0.24656897 +0.34625491
P 3.79 H 14.0 G 0.15
From observations at 4 oppositions, 1960-1990. Ref. MPC 17195.
1 2 3 4 5 6 7
01234567890123456789012345678901234567890123456789012345678901234567890
Name,Magnitude H,Magnitude G,Mean anomaly,Arg. perihelion,Long. node,Inclination,Eccentricity,Semimajor axis,Epoch (MJD)
AALTJE 677,9.70,0.15,47.68385,272.29565,272.71469,8.48713,0.04530949,2.95528649,48600
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>
static char s[8][132]; /* Buffer to hold complete entry */
static int rs(char *s, FILE *fp)
{
if (fgets(s, 132, fp) == NULL) {
return 0;
}
while (strlen(s) > 0 && s[strlen(s) - 1] < ' ') {
s[strlen(s) - 1] = 0;
}
return 1;
}
static void sc(char *b, int line, int start, int end) {
char *c = s[line];
int i, n;
for (i = 0, n = start; n <= end; n++) {
if (c[n] == 0) {
break;
}
if (!isspace(c[n])) {
b[i++] = c[n];
}
}
b[i] = 0;
}
int main(int argc, char *argv[])
{
int i, p, running = 1, recov, written = 0;
#define IBN 4
static char ib[IBN][132];
FILE *fi = stdin, *fo = stdout; /* Input and output file names */
#ifdef EDITMODE
FILE *fn = NULL;
#endif
static char anum[80], aname[80], epoch[80], meanan[80], semimaj[80],
eccen[80], argperi[80], longnode[80], inclin[80], magh[80], magg[80];
if (argc > 1) {
fi = fopen(argv[1], "r"); /* Input file */
if (fi == NULL) {
fprintf(stderr, "Cannot open input file %s\n", argv[1]);
return 2;
}
if (argc > 2) {
fo = fopen(argv[2], "w"); /* Output file */
if (fo == NULL) {
fprintf(stderr, "Cannot open output file %s\n", argv[2]);
return 2;
}
#ifdef EDITMODE
if (argc > 3) {
fn = fopen(argv[3], "w"); /* Edit mode file */
if (fn == NULL) {
fprintf(stderr, "Cannot open numeric format output file %s\n", argv[3]);
return 2;
}
}
#endif
}
}
#ifdef EDITMODE
fprintf(fo, "Number,Name,Number Name,Name Number,Magnitude H,Magnitude G,Mean anomaly,Arg. perihelion,Long. node,Inclination,Eccentricity,Semimajor axis,Epoch (MJD)\n");
if (fn != NULL) {
fprintf(fn, "Number,Name,Magnitude H,Magnitude G,Mean anomaly,Arg. perihelion,Long. node,Inclination,Eccentricity,Semimajor axis,Epoch (MJD)\n");
}
#else
fprintf(fo, "Name,Magnitude H,Magnitude G,Mean anomaly,Arg. perihelion,Long. node,Inclination,Eccentricity,Semimajor axis,Epoch (MJD)\n");
#endif
while (1) {
char *u, *v;
p = 0;
while (1) {
#define ibm(x) ib[(p + (IBN - (x))) % IBN]
if (!rs(ib[p], fi)) {
running = 0;
break;
}
if (strncmp(ib[p], "Epoch ", 6) == 0 &&
strstr(ib[p], "TT") != NULL &&
strchr(ib[p], '=') != NULL &&
strstr(ib[p], "JDT") != NULL) {
/* MPECs for recovered objects contain an "Id." line after the name
and before the Epoch, instead of a "From" line at the end of the
elements. If this is the case with these elements, move the ID
to the end of the elements and shift everything else up one line. */
recov = strncmp(ibm(1), "Id", 2) == 0;
strcpy(s[0], ibm(recov ? 2 : 1));
strcpy(s[1], ib[p]);
for (i = 0; i < 5; i++) {
if (!rs(s[i + 2], fi)) {
running = 0;
break;
}
}
p = (p + 1) % IBN;
break;
}
p = (p + 1) % IBN;
}
if (!running) {
break;
}
/* Scan asteroid number, if one has been assigned. */
if ((u = strchr(s[0], '(')) != NULL && (v = strchr(u + 1, ')')) != NULL) {
u += 1;
*v++ = 0;
strcpy(anum, u);
} else {
v = s[0];
strcpy(anum, "(Unnamed)");
}
/* Scan name or other designation */
while (isspace(*v)) {
v++;
}
while (strlen(v) > 0 && isspace(v[strlen(v) - 1])) {
v[strlen(v) - 1] = 0;
}
strcpy(aname, v);
/* Epoch isn't always precisely aligned in MPC postings.
Allow for some slack. */
v = strstr(s[1], "JDT");
if (v == NULL) {
strcpy(epoch, "0"); /* Zero should get somebody's attention */
} else {
sprintf(epoch, "%g", atof(v + 3) - 2400000.5);
}
sc(meanan, 2, 2, 15);
sc(semimaj, 4, 2, 15);
sc(eccen, 5, 2, 15);
sc(argperi, 3, 26, 35);
sc(longnode, 4, 26, 35);
sc(inclin, 5, 26, 35);
sc(magg, 6, 39, 48);
sc(magh, 6, 20, 30);
/* Mean anomaly is blank in some MPECs, meaning zero.
Home Planet correctly interprets the blank field as zero,
but it might confuse other programs. Replace it with 0.0 if
blank. */
if (strlen(meanan) == 0) {
strcpy(meanan, "0.0");
}
/* Output information in CSV format */
#ifdef EDITMODE
fprintf(fo, "%s,%s,%s %s,%s %s,%s,%s,%s,%s,%s,%s,%s,%s,%s\n",
anum, aname, anum, aname, aname, anum, magh, magg, meanan, argperi,
longnode, inclin, eccen, semimaj, epoch);
if (fn != NULL) {
fprintf(fn, "%s,%s %s,%s,%s,%s,%s,%s,%s,%s,%s,%s\n",
anum, anum, aname, magh, magg, meanan, argperi,
longnode, inclin, eccen, semimaj, epoch);
}
#else
fprintf(fo, "%s %s,%s,%s,%s,%s,%s,%s,%s,%s,%s\n",
aname, anum, magh, magg, meanan, argperi,
longnode, inclin, eccen, semimaj, epoch);
#endif
written++;
}
fclose(fi);
fclose(fo);
#ifdef EDITMODE
if (fn != NULL) {
fclose(fn);
}
#endif
fprintf(stderr, "%d record%s written.\n", written, written == 1 ? "" : "s");
return 0;
}