// ORBITAL LOGISTICS AND PROPULSION TERM
TLE
TLE is a common, compact data format used to describe the orbit of an object in space, like a satellite. It contains all the necessary numbers to predict where the object will be at a future time.
TECHNICAL DEFINITION
TLE, or Two-Line Element set, is a standardized data format containing a set of orbital elements (e.g., epoch, inclination, eccentricity, mean motion) used by NORAD and other space agencies to represent the state vector and predict the trajectory of Earth-orbiting objects.
BACKGROUND
The International Space Station (ISS) is a space station in low Earth orbit (LEO). It is the product of the International Space Station program and is operated by five partner space agencies: NASA, Roscosmos (Russia), ESA (Europe), JAXA (Japan), and CSA (Canada). It is the first space station built, maintained and crewed through international cooperation and the largest human spacecraft ever constructed. It is an orbital research station, where scientific experiments in microgravity are conducted and the space environment is studied. Since 2 November 2000, it has hosted the longest continuous presence of humans in space. Alongside Tiangong, it is one of the only two currently operational space stations.
READ MORE ON WIKIPEDIASYNONYMS & ALIASES
- Two-Line Element set
- orbital data
- satellite data
- NORAD TLE
USAGE NOTE
TLEs are widely used by satellite operators and amateur astronomers to track and identify space objects.
DEVELOPERS
Organizations developing technology related to TLE.
The primary organization responsible for tracking objects in Earth orbit and generating the public catalog of Two-Line Element (TLE) sets via the U.S. Space Surveillance Network. They maintain the authoritative public space object catalog on Space-Track.org.
A commercial provider of space situational awareness (SSA) services that operates its own global network of phased-array radars. They generate high-fidelity orbital data for objects in Low Earth Orbit, which serves as a higher-precision alternative or supplement to public TLEs.
A federally funded research and development center (FFRDC) that provides deep technical expertise in astrodynamics and space situational awareness. It analyzes and advances orbital data formats and is the institutional home of Dr. T.S. Kelso, the operator of CelesTrak, a definitive source for TLE data distribution.
Developer of Systems Tool Kit (STK), a leading physics-based software platform for the aerospace and defense industry. STK is widely used for modeling, analyzing, and visualizing assets in space, heavily relying on the ingestion and propagation of TLE data.
Specializes in space domain awareness by operating a global network of optical telescopes. The company provides persistent tracking and characterization of satellites and debris, primarily in geosynchronous orbit, offering data that enhances TLE-based positional awareness.
Monitors the space environment and conducts research on all aspects of space debris. The office maintains its own database of orbiting objects (DISCOS) and develops technologies for orbit determination and prediction, often utilizing TLEs for conjunction analysis and re-entry predictions.
A software company focused on space traffic management and autonomous collision avoidance for satellite operators. Their platform processes TLEs and other ephemeris data to provide predictive conjunction alerts and recommend safe maneuvers.
Develops a space situational awareness and data analytics platform that fuses information from multiple sources, including the public TLE catalog, commercial sensors, and other data streams, to provide a unified view of the space environment for operators.