mirror of https://github.com/XEphem/XEphem.git
264 lines
8.6 KiB
Perl
Executable File
264 lines
8.6 KiB
Perl
Executable File
#!/usr/bin/perl
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# convert MPCORB.DAT to 2 .edb files.
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# Usage: [-f] <base>
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# if -f then use ftp to get the script from harvard, 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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# mpcorb.dat is a service of the Minor Planet Center,
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# http://cfa-www.harvard.edu/cfa/ps/mpc.html.
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#
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# Copyright (c) 2000 Elwood Downey
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# 16 Mar 1999: first draft
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# 17 Mar 1999: change output filename
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# 4 Apr 2000: update arg handling and support new MPC file format.
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# 6 Oct 2000: add -f
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# 30 Jan 2003: add XCN.
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# 24 Sep 2004: only remove files if downloaded fresh
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# 1 Nov 2012: change from ftp to curl for better error handling.
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# 4 Jul 2014: change download site
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# grab RCS version
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my $ver = '$Revision: 1.3 $';
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$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 Minor Planet Center Orbit Database
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# ================================================================================
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# XEphem Catalog Notes. (XCN)
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# ---------------------------
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# MPC Orbit Database
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# * The MPC Orbit Database (MPCORB) is available for downloading from the anon-ftp
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# link ftp://cfa-ftp.harvard.edu/pub/MPCORB/.
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# Download either the complete file or daily updates.
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# * Note that the security features used in this ftp server require that your
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# machine be found in a "reverse DNS lookup" in order to access this site. A
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# number of ISPs do not properly DNS-register their IP addresses: attempts at
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# access from such ISPs will fail. You should complain to your ISP if your
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# machine cannot access this ftp server.
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# * You must also ensure that you have set your anonymous ftp password in your
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# browser. This password must contain the "@" character. The default values for
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# this setting in browsers such as Netscape and Mozilla will NOT work. (New
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# requirement 2003 Aug. 27)
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#
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# License and Acknowledgements.
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# ----------------------------
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# This file contains published orbital elements for all numbered and
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# unnumbered multi-opposition minor planets for which it is possible to
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# make reasonable predictions. It also includes published elements for
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# recent one-opposition minor planets and is intended to be complete
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# through the last issued Daily Orbit Update MPEC. As such it is
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# intended to be of interest primarily to astrometric observers.
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#
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# Software programs may include this datafile amongst their datasets,as
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# long as this header is included (it is acceptable if it is contained
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# in a file separate from the actual data) and that proper attribution
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# to the Minor Planet Center is given. Credit to the individual orbit
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# computers is implicit by the inclusion of a reference and the name of
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# the orbit computer on each orbit record. Information on how to obtain
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# updated copies of the datafile must also be included.
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#
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# The work of the individual astrometric observers,without whom none of
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# the work of the Minor Planet Center would be possible, is gratefully
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# acknowledged.
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#
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# New versions of this file, updated on a daily basis,will be available
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# at: ftp://cfa-ftp.harvard.edu/pub/MPCORB/MPCORB.DAT
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# These files are rebuilt each night, generally between 02:00 and
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# 03:00 EST (07:00 and 08:00 UT), except during the short period each
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# month when the next batch of Minor Planet Circulars are being
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# prepared.
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# ================================================================================
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EOF
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# setup cutoff mag
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my $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 $MPCSITE = "https://www.minorplanetcenter.net";
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my $MPCFTPDIR = "/iau/MPCORB";
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my $MPCFILE = "MPCORB.DAT";
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my $MPCZIPFILE = "MPCORB.DAT.gz";
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my $MPCOUTFILE = "AstMPC";
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# immediate output
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$| = 1;
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# crack args.
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# when thru here $fnbase is prefix name and $srcfd is handle to $MPCFILE.
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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, $MPCFILE or die "$MPCFILE: $?\n";
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$ARGV[1] = $MPCOUTFILE if $ARGV[1] =~ /$MPCZIPFILE/; # 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 $ARGV[0] =~ /$MPCZIPFILE/; # Check is local file is gzipped.
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open SRCFD, $MPCFILE or die "$MPCFILE: $?\n"; # Otherwise go to process.
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$ARGV[0] = $MPCOUTFILE if $ARGV[0] =~ /$MPCZIPFILE/; # Correct the output name if gzipped.
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$srcfd = SRCFD;
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$ARGV[0] = $MPCOUTFILE if $ARGV[0] =~ /$MPCFILE/; # Correct the output name if gzipped.
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$fnbase = $ARGV[0];
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}
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# create output files prefixed with $fnbase
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$brtfn = "$fnbase.edb"; # name of file for bright asteroids
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open BRT, ">$brtfn" or die "Can not create $brtfn\n";
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$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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$from = "# Data is from ftp://cfa-ftp.harvard.edu/pub/MPCORB/MPCORB.DAT\n";
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$what = "# Generated by mpcorb2edb.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 $XCN;
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# process each mpcorb.dat entry
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while (<$srcfd>) {
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chomp();
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if (/^-----------/) {
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$sawstart = 1;
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next;
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}
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next unless ($sawstart);
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# build the name
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$name = &s(167, &min(length(),194));
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$name =~ s/[\(\)]//g;
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$name =~ s/^ *//;
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$name =~ s/ *$//;
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next if ($name eq "");
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# gather the orbital params
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$i = &s(60,68) + 0;
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$O = &s(49,57) + 0;
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$o = &s(38,46) + 0;
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$a = &s(93,103) + 0;
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$e = &s(71,79) + 0;
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$M = &s(27,35) + 0;
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$H = &s(9,13) + 0;
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$H = 100 if ($H == 0); # beware blank field
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$G = &s(15,19) + 0;
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$cent = &s(21,21);
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$TY = &s(22,23) + 0;
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$TY += 1800 if ($cent =~ /I/i);
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$TY += 1900 if ($cent =~ /J/i);
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$TY += 2000 if ($cent =~ /K/i);
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$TM = &mpcdecode (&s(24,24)) + 0;
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$TD = &mpcdecode (&s(25,25)) + 0;
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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 $fd "$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 $MPCFILE;
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unlink $MPCZIPFILE;
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}
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print "Done\n";
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exit 0;
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# like substr($_,first,last), but one-based.
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sub s
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{
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substr ($_, $_[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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{
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.43429*log($_[0]);
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}
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# return absolute value
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sub absv
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{
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$_[0] < 0 ? -$_[0] : $_[0];
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}
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# return decoded value
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sub mpcdecode
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{
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my $x = $_[0];
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$x =~ /\d/ ? $x : sprintf "%d", 10 + ord ($x) - ord ("A");
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}
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# return min of two values
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sub min
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{
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$_[0] < $_[1] ? $_[0] : $_[1];
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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 $MPCFILE to 2 .edb files.\n";
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print "Options:\n";
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print " -f: first $MPCFILE from $MPCSITE, 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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exit 1;
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}
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# get and unzip the data
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sub fetch
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{
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# transfer
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print "Getting $MPCFTPDIR/$MPCZIPFILE from $MPCSITE...\n";
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$cmd = "curl -connect-timeout 10 -s -u 'anonymous:xephem\@clearskyinstitute.com' $MPCSITE/$MPCFTPDIR/$MPCZIPFILE > $MPCZIPFILE";
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print "$cmd\n";
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!system "$cmd" or exit(1);
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# extract into current dir
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print "Decompressing $MPCZIPFILE...\n";
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unlink $MPCFILE; # avoid unzip asking OK to overwrite
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!system "gunzip $MPCZIPFILE" or die "$MPCZIPFILE: gunzip failed\n";
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-s $MPCFILE or die "$MPCFILE: failed to create from unzip $MPCZIPFILE\n";
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# flag
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$fetchok = 1;
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}
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