...sorry I typed the Norad of the r/b instead of that of the spacecraft... Simone >----Messaggio originale---- >Da: satrack@libero.it >Data: 11-nov-2011 20.55 >A: <ssl3molcz@rogers.com>, <seesat-l@satobs.org> >Ogg: R: RE: Phobos-Grunt: latest two TLEs suggest manoeuvring or venting > >Am I wrong or with the new TLE (11315.4526) the spacecraft position is changed? > >Regards, >Simone > >>----Messaggio originale---- >>Da: ssl3molcz@rogers.com >>Data: 11-nov-2011 17.38 >>A: <seesat-l@satobs.org> >>Ogg: RE: Phobos-Grunt: latest two TLEs suggest manoeuvring or venting >> >>While waiting for new TLEs of the s/c, I have been taking a closer look at >the two that indicate an orbit change. >>Interestingly, both nearly intersect with the pre-orbit change TLE at about >the time of a pass within range of Baikonur, >>on Nov 10 from ~20:16 to 20:23 UTC. >> >>Probably, this will turn out to be a meaningless coincidence, but it does >seem interesting in view of efforts to >>communicate with the s/c from that site, so I am putting this out with the >caveat that I have been burned lots of times >>by spurious TLEs and various coincidences that later proved meaningless. >Subsequent TLEs could make this all go poof! >> >>Below are the circumstances of the pass. I don't know the coordinates of the >telemetry transmitter, so for now, I used >>those of the Zenit pad used for the launch: >> >> UTC >>20:15:54 rose above 0 deg elevation >>20:16:17 reached 2 deg >>20:19:36 culminated at ~30 deg >>20:23:06 set below 2 deg >>20:23:31 set below 0 deg >> >>Closest approach between pre-orbit change TLE and first post-change TLE is >~20:15:52 UTC. Relative the second >>post-change TLE, it is ~20:13:36 UTC. Due to the low delta-V, these times are >not well-defined, and uncertainty is at >>least several minutes. >> >>If there was a single impulse at the point of intersection, then delta-V was >1.3 to 1.6 m/s (4 to 5 fps). >> >>Ted Molczan >> >> >>_______________________________________________ >>Seesat-l mailing list >>http://mailman.satobs.org/mailman/listinfo/seesat-l >> > > >_______________________________________________ >Seesat-l mailing list >http://mailman.satobs.org/mailman/listinfo/seesat-l > _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
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