Re: Question about the age of available TLEs

From: Gavin Eadie via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 13 Feb 2018 11:23:01 -0500
.. just checked the "NASA real time" TLE epochs.  The first few:

ISS: Feb 12, 2018 at 7:29:15 AM EST
ISS: Feb 13, 2018 at 3:33:01 AM EST
ISS: Feb 14, 2018 at 4:14:34 AM EST <---
ISS: Feb 15, 2018 at 3:23:32 AM EST
ISS: Feb 15, 2018 at 6:28:44 AM EST
ISS: Feb 16, 2018 at 7:10:16 AM EST

The AmSat one is marked.

My question comes down to whether the most recently past TLE, or the first future TLE is "better."  My instinct would be to use the today’s TLE over tomorrow’s.

I’m still well aware that a reasonable answer is, "who cares, any difference is smaller than the precision of the propagation algorithm"

> On Feb 13, 2018, at 11:10 AM, Gavin Eadie <gavin_at_umich.edu> wrote:
> 
> As I write this on Feb 13 at ~11:10 AM EST, the epoch on the ISS TLE in the AmSat list is not only ahead of Space-Track, it’s also 14 hours in the future [Feb 14, 2018 at 4:14:34 AM EST].  Whoever is creating "nasabare.txt" is choosing to do that .. (a) is that intentional and, (b) is that an acceptable practice?


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Received on Tue Feb 13 2018 - 10:24:04 UTC

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