Two Line Elements


TLE vectors are generated once a day in the morning (reference time between around 7:00 UTC and 8:00 UTC on the generation day or shortly after the end of the next manoeuvre, if taking place on that same day). Their validity arc spans from their reference time to 7 days in the future. Within the validity arc their accuracy is of around 600m RMS (max error around 2km); outside the validity arc the accuracy degradation is very slow, keeping similar accuracy for several weeks.