A standardized data format that encodes the orbital elements of an Earth-orbiting object as two 69-character text lines. Originally developed by the US Space Surveillance Network. Refreshed from radar and optical tracking observations. Used by satellite-tracking software including LaunchDetect to predict object positions.
In LaunchDetect
A TLE includes the inclination, right ascension of ascending node, eccentricity, argument of perigee, mean anomaly, mean motion, and epoch. LaunchDetect keeps TLE data current for its orbital predictions.