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 >> >> >> _______________________________________________ >> Seesat-l mailing list >> http://mailman.satobs.org/mailman/listinfo/seesat-l >> >> _______________________________________________ >> Seesat-l mailing list >> http://mailman.satobs.org/mailman/listinfo/seesat-l > > > > -- > > > *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)* > *paulcefo_at_buffalo.edu* <paulcefo_at_buffalo.edu> > *paul.cefola*_at_gmail.com <paul.cefola_at_gmail.com> > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Fri Apr 28 2017 - 12:36:49 UTC
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