RE: More on GEOSAT solar arrays

From: Matson, Robert (ROBERT.D.MATSON@saic.com)
Date: Wed Dec 25 2002 - 23:31:27 EST

  • Next message: Kurt Jonckheere: "geoflashers : prograde or retrograde spinning ?"

    Lloyd wrote, in part:
    
    > the torque from solar radiation tends to balance out across the
    > craft thanks to symmetry - unless the body is shadowing a large
    > proportion of the furthest panel, which tends to lead to rotation
    > to counter the shadowing.
    
    And yet dead-GEO spin-up is extremely common.  (Superbird A has
    been accelerating ever since we first started measuring it 6+ years
    ago).  All it takes is a small difference in reflectivity/emissivity between
    the left panel and the right panel, and you've got your
    angular acceleration.  And all other factors being equal, if your
    arrays are in the "I" configuration, your satellite is going to
    spin up faster than if they are in the "H" configuration.  --Rob
    
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