Re: R: Phobos-Grunt - serious problem reported

From: Paul Salanitri (paul.salanitri@gmail.com)
Date: Wed Nov 09 2011 - 11:33:13 UTC

  • Next message: satrack@libero.it: "Phobos video of engine burn - Analysis"

    Confirmed current Phobos-Soil track and time:
    
    [09 Nov 2011 UTC:]
    
    Prediction from pre-launch TLE:
     9h:26m:48s   710 315.46 17.08 Lit -16.4 19.569913810  28.010486185 PG
    
    Actual observed:
    09:24:35 315deg19' 17deg01' (next to star Beta1 Cyg)
    
    Visual track exactly as expected, however 2min13s early.
    
    (More detail (lat/long etc) available on request.)
    
    The object changed brightness a number of times, from invisible to about
    mag 1 at times.
    
    Not sure if that would be the fairing or some other part- but only saw one
    object.
    
    Paul Salanitri
    
    
    On Wed, Nov 9, 2011 at 7:45 PM, Paul Salanitri <paul.salanitri@gmail.com>wrote:
    
    > Just observed some part of Phobos-Grunt about 2 minutes early - passed a
    > point at 09:24:40 when expecting it at 09:26:30 (from pre launch TLEs)
    >
    > Bright flares a couple of times - noted a close pass of a star - will have
    > to go through a voice recording to work out precise time.
    >
    > Paul Salanitri
    >
    >
    >
    >
    > On 09/11/2011, at 18:49, "satrack@libero.it" <satrack@libero.it> wrote:
    >
    > > I've updated the site to use the LEO parking orbit. Maybe this helps in
    > the
    > > attempt to find it.
    > > DEC, RA and Magnitude are still displayed.
    > >
    > > http://digilander.libero.it/SATrack/Phobos.html?q=phobos
    > >
    > > Regards,
    > > Simone
    > >
    > >> ----Messaggio originale----
    > >> Da: ssl3molcz@rogers.com
    > >> Data: 9-nov-2011 1.05
    > >> A: <seesat-l@satobs.org>
    > >> Ogg: Phobos-Grunt - serious problem reported
    > >>
    > >> I have just received word from the project that there seems to be a
    > serious
    > > problem.
    > >>
    > >> After the planned first burn of the engine, the spacecraft was not
    > found in
    > > the predicted orbit. Alternative radar
    > >> observations preliminarily show that there are two objects in the orbit
    > with
    > > parameters the same as before the planned
    > >> engine burn. Observers are requested to attempt to discover the
    > spacecraft in
    > > the initial LEO parking orbit.
    > >>
    > >> This is the official pre-launch estimated TLE of the LEO parking orbit:
    > >>
    > >> 1 55500U 11000A   11312.95486111 -.00010748  00000-0 -11606-4 0    14
    > >> 2 55500  51.4279   0.6058 0106375  25.7555 298.8256 15.98414689    33
    > >>
    > >> I imagine that one of the two objects seen on the radar could be the
    > final
    > > stage of the booster. Accurate descriptions
    > >> and counts of the number of objects seen, as well as position and time
    > would
    > > be useful.
    > >>
    > >> 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
    >
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