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

[Ray Hoad]

I have every AMSAT TLE sent since October 8, 1993 on a backup hard drive.

Ray Hoad
WA5QGD
AMSAT-NA Orbital Elements Manager


-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Armand
SP3QFE
Sent: Saturday, May 12, 2018 13:51
To: Andrew Glasbrenner <glasbrenner at mindspring.com>
Cc: amsat-bb at amsat.org
Subject: Re: [amsat-bb] when are TLE's too old to use?

Hello Everyone,

By the way...
How to get the TLE from the past? eg. to check something form the past 
for some date in the past... such as 30 Apr. 2012?

73, Armand SP3QFE


On 2018-05-12 20:34, Andrew Glasbrenner wrote:
> For everything other than the ISS and lower, weeks. For sats in 600km 
> and
> higher, probably months if you are manual tuning and pointing.
> 
> YMMV.
> 
> 73, Drew KO4MA
> 
> -----Original Message-----
> From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Ron VE8RT
> Sent: Saturday, May 12, 2018 1:03 PM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] when are TLE's too old to use?
> 
> 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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> _______________________________________________
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> to all interested persons worldwide without requiring membership.
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_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb