mirror of https://github.com/XEphem/XEphem.git
259 lines
9.0 KiB
Perl
Executable File
259 lines
9.0 KiB
Perl
Executable File
#!/usr/bin/perl
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# convert astorb.txt to 2 .edb files.
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# Usage: [-f] <base>
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# if -f then use curl to get the script from lowell, else read it from stdin.
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# <base> is a prefix used in naming the generated .edb files.
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# Two files are created:
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# <base>.edb contains only those asteroids which might ever be brighter
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# than $dimmag (set below);
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# <base>_dim.edb contains the remaining asteroids.
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#
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# astorb is a set of elements for 30k+ asteroids maintained by Lowell
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# Observatory. See https://ftp.lowell.edu/pub/elgb/astorb.html. From the
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# Acknowledgments section of same:
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# The research and computing needed to generate astorb.dat were funded
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# principally by NASA grant NAGW-1470, and in part by the Lowell Observatory
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# endowment. astorb.dat may be freely used, copied, and transmitted provided
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# attribution to Dr. Edward Bowell and the aforementioned funding sources is
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# made.
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#
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# grab RCS version
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my $ver = '$Revision: 1.2 $';
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$ver =~ s/\$//g;
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my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst, $me);
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my $XCN=<<EOF;
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# ================================================================================
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# The Lowell Asteroid Orbital Elements Database
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# ================================================================================
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# Introduction
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# astorb.dat is an ASCII file of high-precision osculating orbital elements,
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# ephemeris uncertainties, and some additional data for all the numbered asteroids
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# and the vast majority of unnumbered asteroids (multi-apparition and single-ap-
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# parition) for which it is possible to make reasonably determinate computations.
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# It is currently about 83 Mb in size in its compressed form(astorb.dat.gz)
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# 305 Mb in size when decompressed (astorb.dat).
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# Each orbit, based on astrometric observations
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# downloaded from the Minor Planet Center, occupies one 266-column record.
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#
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# Special Features of astorb.dat
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# There are three primary differences between our database and conventional
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# asteroid orbit files.
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# First, we update the database daily. Thus, observations in each new batch
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# of Minor Planet Circulars will be used in new orbits on a monthly basis, and
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# those in the Minor Planet Electronic Circulars shortly after they are published.
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# Other changes, such as the addition of orbits resulting from our own astrometric
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# observations and the computation of current ephemeris uncertainties, are being
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# made on a quasi-daily basis. Automatic daily updates commence at 8 hr UT. The
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# updating process is generally completed by 10:00 UT. On the UT date of full
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# Moon, the updating process is not completed until 14 hr UT or later.
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#
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# Second, all the orbits in a given version of the file have an epoch of
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# osculation near the present. Consequently, the ephemerides of most non-Earth-
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# -approaching asteroids can be computed to arcsec accuracy or better within ± 50
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# days of the epoch using a 2-body ephemeris program.
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#
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# Third, current and future ephemeris uncertainties are given.Observers will
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# readily be able to estimate whether asteroids are likely to be within their
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# telescopes' fields of view, and they will better be able to prioritize
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# astrometric targets.
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#
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# ================================================================================
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# XEphem Catalog Notes. (XCN)
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# ---------------------------
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#
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# AstLowell.edb
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# astorb is a set of elements for 30k+ asteroids maintained by Lowell
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# Observatory. See https://ftp.lowell.edu/pub/elgb/astorb.html. From the
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# Acknowledgments section of same:
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# The research and computing needed to generate astorb.dat were funded
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# principally by NASA grant NAGW-1470, and in part by the Lowell Observatory
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# endowment. astorb.dat may be freely used, copied, and transmitted provided
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# attribution to Dr. Edward Bowell and the aforementioned funding sources is
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# made.
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# ================================================================================
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EOF
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# setup cutoff mag
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$dimmag = 13; # dimmest mag to be saved in "bright" file
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# set site and file in case of -f
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my $ORBSITE = "https://ftp.lowell.edu";
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my $ORBFTPDIR = "/pub/elgb";
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my $ORBFILE = "astorb.dat";
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my $ORBGZFILE = "astorb.dat.gz";
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my $ORBOUTFILE = "AstLowell";
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# immediate output
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$| = 1;
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# crack args.
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# when thru here $fnbase is prefix name and $srcfd is handle to $ORBFILE.
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if (@ARGV == 2) {
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&usage() unless $ARGV[0] eq "-f"; # Changed @ for $
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&fetch();
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open SRCFD, $ORBFILE or die "$ORBFILE: $?\n";
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$ARGV[1] = $ORBOUTFILE if $ARGV[1] =~ /$ORBGZFILE/; # Correct the output name if gzipped.
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$srcfd = SRCFD;
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$fnbase = $ARGV[1];
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} elsif (@ARGV != 1) {
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&usage();
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} else {
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&usage() if $ARGV[0] =~ /^-/; # Changed @ for $
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&fetch() if $ARGV[0] =~ /$ORBGZFILE/; # Check is local file is gzipped.
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open SRCFD, $ORBFILE or die "$ORBFILE: $?\n"; # Otherwise go to process.
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$ARGV[0] = $ORBOUTFILE if $ARGV[0] =~ /$ORBGZFILE/; # Correct the output name if gzipped.
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$srcfd = SRCFD;
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$fnbase = $ARGV[0];
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}
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# create output files prefixed with $fnbase
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my $brtfn = "$fnbase.edb"; # name of file for bright asteroids
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open BRT, ">$brtfn" or die "Can not create $brtfn\n";
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my $dimfn = "$fnbase"."_dim.edb"; # name of file for dim asteroids
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open DIM, ">$dimfn" or die "Can not create $dimfn\n";
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print "Creating $brtfn and $dimfn..\n";
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# build some common boilerplate
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($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = gmtime;
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$year += 1900;
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$mon += 1;
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$from = "# Data From https://ftp.lowell.edu/pub/elgb/astorb.dat.gz\n";
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$what = "# Generated by astorb2edb.pl $ver, (c) 2000 Elwood Downey\n";
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$when = "# Processed $year-$mon-$mday $hour:$min:$sec UTC\n";
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# add boilerplate to each file
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print BRT "# Asteroids ever brighter than $dimmag.\n";
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print BRT $from;
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print BRT $what;
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print BRT $when;
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print BRT $XCN;
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print DIM "# Asteroids never brighter than $dimmag.\n";
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print DIM $from;
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print DIM $what;
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print DIM $when;
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print DIM $XCN;
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# process each astorb.dat entry. see astorb.txt from same site for format.
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while (<$srcfd>) {
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# build the name
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my $nmbr = &s(1,6);
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$nmbr =~ s/^s+//g;
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$nmbr =~ s/\s+$//g;
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$nmbr =~ s/\s+//g;
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$nmbr = $nmbr+0;
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$name = &s(8,25);
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$name =~ s/^ *//;
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$name =~ s/ *$//;
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# gather the orbital params
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$i = &s(149,157) + 0;
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$O = &s(138,147) + 0;
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$o = &s(127,136) + 0;
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$a = &s(170,181) + 0;
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$e = &s(159,168) + 0;
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$M = &s(116,125) + 0;
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$H = &s(43,47) + 0;
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$G = &s(49,53) + 0;
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$TM = &s(111,112) + 0;
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$TD = &s(113,114) + 0;
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$TY = &s(107,110) + 0;
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# skip obviously bogus entries
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if ($a == 0) {
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next;
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}
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# decide whether it's ever bright
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$per = $a*(1 - $e);
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$aph = $a*(1 + $e);
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if ($per < 1.1 && $aph > .9) {
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$fd = BRT; # might be in the back yard some day :-)
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} else {
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$maxmag = $H + 5*&log10($per*&absv($per-1));
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$fd = $maxmag > $dimmag ? DIM : BRT;
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}
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# print
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print $fd "$nmbr " if ($nmbr != 0);
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print $fd "$name";
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print $fd ",e,$i,$O,$o,$a,0,$e,$M,$TM/$TD/$TY,2000.0,$H,$G\n";
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}
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# remove fetched files, if new
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if (defined($fetchok)) {
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unlink $ORBFILE;
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unlink $ORBGZFILE;
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}
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print "Done\n";
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exit 0;
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# like substr($_,first,last), but one-based.
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sub s {
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my $str=();
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$str = $_;
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# just to reduce the noise from -w.
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substr ($str, $_[0]-1, $_[1] - $_[0]+1);
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}
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# return log base 10
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sub log10 {
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.43429*log($_[0]);
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}
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# return absolute value
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sub absv {
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$_[0] < 0 ? -$_[0] : $_[0];
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}
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# print usage message then die
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sub usage
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{
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my $base = $0;
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$base =~ s#.*/##;
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print "Usage: $base [-f] <base>\n";
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print "$ver\n";
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print "Purpose: convert $ORBFILE to 2 .edb files.\n";
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print "Options:\n";
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print " -f: first ftp $ORBFILE from $ORBSITE, else read from stdin\n";
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print "Creates two files:\n";
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print " <base>.edb: all asteroids ever brighter than $dimmag\n";
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print " <base>_dim.edb: all asteroids never brighter than $dimmag\n";
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print "Note: If you downloaded the file astorb.dat or astorb.dat.gz,\n";
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print " run this script with the file name as the only command.\n";
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print " line option.\n";
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exit 1;
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}
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# get and explode the data
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sub fetch
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{
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# transfer
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print "Getting $ORBFTPDIR/$ORBGZFILE from $ORBSITE...\n";
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$cmd_v1 = "curl -s --connect-timeout 10 -u 'anonymous:xephem\@github.com' https://$ORBSITE/$ORBFTPDIR/$ORBGZFILE > $ORBGZFILE";
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$cmd_v2 = "curl -s --disable-epsv --connect-timeout 10 -u 'anonymous:xephem\@github.com' https://$ORBSITE/$ORBFTPDIR/$ORBGZFILE > $ORBGZFILE";
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print "trying $cmd_v1\n";
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$curl_return = system "$cmd_v1";
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$curl_return = $curl_return >> 8;
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if ($curl_return != 0) {
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print "trying $cmd_v2\n";
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$curl_return = system "$cmd_v2";
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$curl_return = $curl_return >> 8;
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}
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if ($curl_return != 0) {
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die "curl failed\n";
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}
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# explode
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print "Decompressing $ORBGZFILE ...\n";
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$gunzip = "gunzip";
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!system "$gunzip < $ORBGZFILE > $ORBFILE" or die "$gunzip failed\n";
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-s $ORBFILE or die "$ORBFILE: failed to create from $gunzip $ORBGZFILE\n";
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# flag
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$fetchok = 1;
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}
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