I want to find out how long before predictions for a satellites location made using the SGP4 algorithm break down.
For example if I use TLE data from a satellite which was gathered today, how far into the future can I make accurate predictions for that satellites location using that TLE.
The reason I am asking is that TLE data for satellite's are updated irregularly, so I want to have some idea of how long they can be used for predicting the location.
For example if I want to know if any earth observing satellites line of sight passes over my house at exactly 5pm in 7 days time, could I use the SGP4 algorithm to give me a correct result? Or would I need to use a more accurate propagator?
According to the wikipedia page, the error of the SGP4 model is ~1km at epoch and grows at ~1-3km a day. https://en.wikipedia.org/wiki/Simplified_perturbations_models
But I'm wondering what this means for making accurate predictions using this model, is an error of 5-10km much when talking about the area covered by the satellites point of view? (can't remember the name for the area of ground a satellite covers along its path during orbit)