R: Re: Observing the Iridium Flares from the ISS - 3D Simulations and Predictions

From: satrack@libero.it
Date: Fri Jan 14 2011 - 11:14:59 UTC

  • Next message: Robert Reeves: "Re: Observing the Iridium Flares from the ISS - 3D Simulations andPredictions"

    Tom,
    
    yes, during the flare of the video the apparent Earth rotation is well visible 
    and it is due to the Station movement. 
    The video simulates the real speed of the flare, which is not a long one 
    however. Its mirror angular speed is of about 0.1 deg/s
    (the two satellites are far each other but move in opposite directions). Usual 
    flares on the Earth have mirror angular speeds 
    of 0.1 / 0.2 deg/s or more, whilst on the station it should be common to 
    observe flares with mirror angular speeds of 0.02 deg/s. 
    Such long flares can be observed on the Earth only when the reflected ray is 
    approximately in the orbital plane and the elevation of 
    the flaring satellite is low. At the following link I uploaded a couple of 
    pictures of long flares:
    
    http://digilander.libero.it/SATrack/LongIridiumFlares.html
    
    Regards,
    Simone
    
    >----Messaggio originale----
    >Da: sciteach@mchsi.com
    >Data: 14-gen-2011 1.29
    >A: <seesat-l@satobs.org>
    >Ogg: Re: Observing the Iridium Flares from the ISS - 3D Simulations and	
    Predictions
    >
    >Hello Simone,
    >
    >In your 3D simulation of the flare occurring over the earth, I see that the 
    earth rotates significantly [during] the flare. You may have said this in the 
    description and I missed it but to to be sure I'll ask - is the flare that is 
    being simulated lasting a lot longer than it actually would?
    >
    >Thanks
    >
    >Tom   Iowa   USA
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