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

[John Brier]

I like space-track.org for this. You have to create an account but you
can give it an object ID and a date range and it will give you the
keps for that date range. Very convenient.

https://www.space-track.org/auth/login

On Sat, May 12, 2018 at 8:05 PM, Ray Hoad <ray.hoad at mypbmail.com> wrote:
> 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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>> _______________________________________________
>> 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
> _______________________________________________
> 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
>
>
> _______________________________________________
> 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