Re: TLE with future epoch

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

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)*

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