Re: ISS B* value

From: Bjorn Gimle (
Date: Wed Apr 28 2004 - 03:59:20 EDT

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    Although the apogee/perigee difference of ISS is of the order of 10 km, 
    the drag increase when perigee is near the equator should be noticable.
    The natural precession rate would be 3.8 d/day, and perigee at
    asc or desc node would occur at 47.5 day intervals.
    Reboosts appear to disrupt the smooth precession, and this period
    seems to be near 45 days over a long interval.
    > If it were closer to 28 days, I would suspect it to modulated by
    > the moon. Are there some other periodicities in the ISS equation
    > of motion that would have that period?                                                            
    > Jim.                                                                         
    > On Mon, 19 Apr 2004, Moritz Heger wrote:                                     
    > > Hello everyone,                                                            
    > >                                                                            
    > > This is slightly off-topic, as it does not directly stand in
    > > relation with visual satellite observing, but I do not know
    > > where to ask elsewhere.      
    > >                                                                            
    > > Looking closer on the BSTAR drag value of the ISS over time,
    > > I noticed that it is varying by around 10% with a period of
    > > about 20 days.                
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