Space Regulatory Glossary Industry

TLE

/tiː ɛl iː/ noun (abbr.) Two-Line Element

1. Two-Line Element set. A standardized data format for describing a satellite's orbital elements at a specific epoch, encoded in two 69-character lines of text. TLEs include inclination, eccentricity, mean motion, and drag parameters.
2. Published by the U.S. Space Force's 18th Space Defense Squadron via Space-Track.org. TLEs are the primary means by which satellite operators, researchers, and tracking services determine where objects are in orbit and predict their future positions.

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