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

[Mark D. Johns]

Depends on what your margin for error is. In other words, define
"worthless."

In general, I update keps weekly. But for most LEOs and casual ham
operation, you could probably go 90 days or more and still find most birds
with your Arrow and handheld within a few minutes.

For ISS or other spacecraft with the ability to adjust the orbit with
thrusters, etc., you'd only be good until the next orbit boost.
--
Mark D. Johns
KØJM / MØGZO / ex-9H3DJ / ex-KØMDJ
Brooklyn Park, MN USA   EN35hd
-----------------------------------------------
"Heaven goes by favor; if it went by merit,
   you would stay out and your dog would go in."
    ---Mark Twain

On Sat, May 12, 2018 at 12:02 PM, Ron VE8RT <ve8rt at yknwt.ca> 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
>
> --
> Ron VE8RT <ve8rt at yknwt.ca>
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