Tracking launches Launch Library - https://launchlibrary.net/ API: https://launchlibrary.net/1.2/docs/api.html CELESTRAK wget http://www.celestrak.com/cgi-bin/TLE.pl?CATNR=$SATID perl-Astro-SpaceTrack - requires credentials for spacetrack. Ted Molczan & the SeeSat-L mailing list community of satellite watchers SatOBS SeeSat-L Web Archive