Re: Double flare of Iridium 13

From: Ed Cannon (
Date: Wed Mar 28 2001 - 01:42:19 PST

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    Ken ( wrote:
    > Tonight 3/27, I saw two flares from the Iridium 13 satellite. 
    > The first one was at about 19:54 ....  I would guess it was 
    > about -1.  The second flare was about a minute later but not 
    > as bright ....  These flares were not predicted by 
    > heavens-above for this area.
    Using the Heavens-Above coordinates for Cary, NC, Iridflar 
    predicts a flare about +1 at about 19:54:10 with the center 
    line about 32 miles west of Cary.  I can't find it right now, 
    but I think that the H-A Iridium flare magnitude cut-off is 
    zero magnitude.
    The reliability of Iridium flare magnitude predictions is very 
    sensitive to how close you are to the center line (especially
    in the east-west direction).  If you're five miles east or west 
    of that line, the predicted magnitudes can be way off.  For 
    Iridium flares it's recommended to get your location as close 
    as you can.  You can go to a site like this one (USA only):

    put in your street address, and it will give you very precise 
    coordinates -- which will give you the best possible Iridium 
    flare predictions.  If you are able to run one of the available
    DOS prediction programs, you can get predictions for "flares" 
    as faint as you want!
    Ed Cannon - - Austin, Texas, USA
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