Re: TLE with future epoch

From: Marco Langbroek via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 28 Apr 2017 19:36:12 +0200
Verstuurd vanaf mijn iPad

> Op 28 apr. 2017 om 19:08 heeft Paul Cefola via Seesat-l <seesat-l_at_satobs.org> het volgende geschreven:
> 
> It would b interesting to hear a comment on the accuracy of the TLE for the
> long period orbits that are mentioned in this discussion.
> 
> Paul Cefola
> 


For the Chang'e 3rb, I have found it highly inaccurate.

Marco




> On Fri, Apr 28, 2017 at 12:37 PM, Dr. T.S. Kelso via Seesat-l <
> seesat-l_at_satobs.org> wrote:
> 
>> Hi Simone,
>> 
>> As Cees points out, JSpOC does this regularly. We do track this on
>> CelesTrak at http://celestrak.com/NORAD/elements/predicted-tles.txt, if
>> you ever want to see which TLEs are involved. We have seen some with epochs
>> almost 30 days in the future. We track this because it can cause problems
>> for certain groups of our users.  - TS
>> 
>> Dr. T.S. Kelso
>> CelesTrak, https://celestrak.com
>> E-Mail: ts.kelso_at_celestrak.com<mailto:ts.kelso_at_celestrak.com>
>> 
>> On 2017 Apr 28, at 00:56, satrack--- via Seesat-l <seesat-l_at_satobs.org
>> <mailto:seesat-l_at_satobs.org>> wrote:
>> 
>> Hi All,
>> I've just noticed that some TLEs from Space Track have epoch in the
>> future. Is that usual?Does this simply mean that the TLE parameters have
>> been propagated for a future time?
>> As an example, object with Norad 20413 have epoch 17121, almost 3 days in
>> the future.
>> (I've also noticed that the age of high interest objects has increased).
>> Regards,Simone
>> 
>> 
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> 
> 
> 
> -- 
> 
> 
> *Dr. Paul J. CefolaConsultant in Aerospace Systems, Spaceflight Mechanics,
> & AstrodynamicsAdjunct Faculty, Dept. of Mechanical and Aerospace
> Engineering, University at Buffalo (SUNY)*
> 
> *4 Moonstone Way*
> *Vineyard Haven, MA 02568*
> 
> 
> 
> 
> 
> *USA508-696-1884 (phone on Martha's Vineyard)978-201-1393 (cell)*
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Received on Fri Apr 28 2017 - 12:36:49 UTC

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