Phobos-Grunt Active Attitude Control

From: Paul Salanitri (paul.salanitri@gmail.com)
Date: Sun Nov 13 2011 - 02:25:14 UTC

  • Next message: Ted Molczan: "RE: Phobos-Grunt: latest two TLEs suggest manoeuvring or venting"

    According to http://www.russianspaceweb.com/phobos_grunt_design.html (which
    I'm still interpreting) there may be attitude control thrusters used during
    the early stages.
    
    "Low-thrust attitude-control thrusters onboard MDU had a combined thrust of
    20-25 kilograms."
    
    If it does use thrusters - then this *may* explain the changes in orbit.
    It would also mean that some part of the spacecraft is still operational.
    [I'm speculating and asking for feedback on its thruster knowledge].
    
    Rough calculations based on a delta V of 1 m/s (from Ted's calculations)
    would be about 60 seconds of attitude thrusting within a day.  Not
    unreasonable.
    
    Paul S.
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