Re: TLE with future epoch

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 28 Apr 2017 15:10:20 +0200
Hi Simone,

On Fri, Apr 28, 2017 at 12:56 PM, satrack--- via Seesat-l
<seesat-l_at_satobs.org> wrote:
> 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.

JSpOC defines the epoch of a TLE at an ascending node passage. In some
cases, especially those with long period orbits, this can be several
days in the future. In essence that does indeed mean that the TLE
parameters have been propagated to the specified epoch.

Regards,
    Cees
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Received on Fri Apr 28 2017 - 08:10:43 UTC

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