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

From: Tom Wagner (
Date: Sat Jul 15 2006 - 21:20:18 EDT

  • Next message: Scott Campbell: "Satobs 16 July 2006"

    It seems that the naked eye limiting magnitude of a star (anyway) in 
    daylight, under perfect conditions and high altitude, is magnitude -1. See 
    the article, "On the Visibility of Sirius in Daylight," here: 
    So, I would assume that if a person looked at a far from the sun lunar 
    transit (or near miss) of the ISS, that the ISS might be visible, especially 
    in the future.
    If one had a descent way of setting a scope to a particular coordinate, the 
    scope could be lined up and low power used to try to catch a glimpse of the 
    ISS any time and anywhere during the day. If I wasn't concerned about my 
    telescope disappearing from the time I line it up at night to the next day, 
    I would try it. For knowing exactly where to look for daytime iridium flares 
    I made a device that is a tube with two parallel eyebolts on it. The night 
    before I line it up on the exact part of the sky the flare is going to occur 
    in then I leave it till daylight the next day. It only requires that I lay 
    on my back to align the two eyebolts and be there to use it when the flare 
    I myself have observed lunar occultations of Jupiter and Saturn in full 
    daylight using binoculars and a 5 inch scope with various magnifications.
    Tom  Iowa  USA
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