: This is the authoritative source for Two-Line Element (TLE) sets for all cataloged satellites. You can register for a free account at Space-Track to download custom satellite text files.
Satellite identification program for astrometrists - Project Pluto Download 08ndasat txt
: For users of the Guide planetarium software, official updates and satellite identification files (like all_tle.txt ) are provided on the Project Pluto Update Page . : This is the authoritative source for Two-Line