Re: ISS to be visible in daylit skies (?)

From: Gerhard HOLTKAMP (
Date: Sun Jul 16 2006 - 17:15:20 EDT

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    Stephan Szyman wrote:
    >I doubt the addition of the new arrays and modules will change the station's 
    >intrinsic brightness by too much, and I'd think in order to be visible 
    >during daylight the brightness would need to reach at least -5 or perhaps 
    I agree. If you double the reflecting area the magnitude will increase by 
    2.5*log10(2) = 0.75. Even if you can see bright stars in plain daylight a 
    quickly moving target like the ISS must be much brighter that a quasi 
    stationary star in order to be recognized by the human eye. It might be 
    possible to see the ISS if you have a reference in the sky like the Moon.
    Actually seeing the ISS in plain daylight is nothing new to me (and a lot of 
    other observers). You just have to watch a solar transit of the ISS. And 
    those transits are bound to become more spectacular with the addition of more 
    solar arrays. I can hardly wait!
    Gerhard HOLTKAMP
    Darmstadt, Germany
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