[amsat-bb] when are TLE's too old to use?

[Alfredos (fredy) Damkalis]

Recently it was posted in libre.space community discourse[1] by cgbsat
an interesting analysis about TLE of a couple of satellites and what
delays you should expect in observation starting time when you use TLE
0-10 days old.

Delays vary depending on satellite, difference could be from some
seconds to some minutes (in ISS case).

I'm very interested if there are similar analyses.

73,
fredy

[1] https://community.libre.space/t/tle-updates-and-scheduling/1987/4

On 05/12/2018 08:02 PM, Ron VE8RT wrote:
> I understand that there won't be a good answer for how old can TLE's be
> before they're of no use.  If you were going to be offline for an
> extended period, roughly, for a LEO, how long would you go before
> they're worthless?
> 
>    Ron VE8RT
>