R: Phobos Grunt attitude based upon visual observations

From: satrack@libero.it
Date: Sun Nov 27 2011 - 11:21:43 UTC

  • Next message: Russell Eberst: "2011NOV27.OBS"

    Theoretically, flares could provide accurate information Đ°bout the satellite 
    attitude, but from the pictures I can't spot any flat surface 
    that could give bright flares. However, if someone of you is aware of some 
    parts that could flare and knows how the spacecraft's attitude 
    control is supposed to work, I can try to code the model in my program.
    Yesterday I observed a 74 degree pass. It was orange at about magnitude 1. 
    After culmination I also noticed a rapid brightness decrease.
    >----Messaggio originale----
    >Da: ronlee@pcisys.net
    >Data: 27-nov-2011 3.49
    >A: <seesat-l@satobs.org>
    >Ogg: Phobos Grunt attitude based upon visual observations
    >Since Derek Breit provided a picture of the spacecraft that explained the 
    color, I am wondering if the attitude may be inferred from the visual magnitude 
    during a pass.  In particular, the 87 degree pass I observed a few days ago did 
    show a significant brightness decrease at some point after culmination.
    >Assuming that the spacecraft would have been in some inertial attitude for 
    the planned burns over South America, if it remained in the same attitude since 
    the observed magnitude might be different than if some part of the spacecraft 
    always faces to the nadir (Earth).
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