TLEs are how the global space surveillance community shares orbital data. They're a 1970s format that persists because every piece of orbital software in the world can read them — and that ubiquity beats any technical improvement.
TLEs are how the global space surveillance community shares orbital data. They're a 1970s format that persists because every piece of orbital software in the world can read them — and that ubiquity beats any technical improvement.
Each TLE is exactly two 69-character lines (plus an optional title line). Fixed-width format, designed for punch-card-era computing.
A TLE is only accurate at its epoch. Error accumulates as time passes — and accumulates faster in some orbits than others.
TLEs are not raw measurements — they are fitted parameters calibrated specifically for the SGP4 propagation model.
The TLE ecosystem has multiple tiers of sources, each with different update frequency, coverage, and accuracy.
Orbital Radar ingests TLE feeds continuously and runs them through SGP4 to compute positions, passes, and conjunctions. The freshness indicator next to any object tells you how confident to be in what you're seeing — and when to treat outputs as approximate rather than authoritative.