Re: Please explain ... double flare by Ir 81

From: Edward S Light (light@argoscomp.com)
Date: Thu Dec 20 2001 - 09:37:50 EST

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    On Thursday, 20 Dec 2001, Anthony Ayiomamitis <anthony@perseus.gr> wrote:
    >
    > Subject: Please explain ... double flare by Ir 81
    >
    > Dear List,
    >
    >        I have something new which is perplexing and I would appreciate
    > some feedback. Rob's IridFlar is generating a double flare by the same
    > Iridium satellite in the space of a few seconds and I would appreciate
    > some rationale behind this phenomenon.
    >
    >        The first flare will start at 7:07:39 and last 4 seconds on Dec
    > 27/01 ... the second flare will start at 7:07:45 and last 6 seconds ...
    > the respective magnitudes are -2.4 and -0.6 which should (?) be
    > sufficiently bright for a photo at that time of the morning.
    >
    >        In browing through my list of predictions, I see a couple of
    > other opportunities about 1-2 minutes apart for the week after the above
    > flare which suggests that something is at play.
    >
    > Anthony.
    >
    
    I've noted similar phenomena in my Iridflar predictions and in every case,
    one of the flares was a solar panel flare (denoted in the output by "S")
    and the other a "normal" main mission antenna flare.
    
    For example, here is Iridflar's "brief" output for this coming Saturday
    morning's Iridium 34 ...
    
    Latitude:  40.10751  Longitude:  -74.23123  Altitude:    80.0 ft
    Time Zone: UTC  -5.0 h
    
           Local     Local    Iridium         Sun    Flare   Maximum Flare  Ird
    Day    Date      Time   Azm El Rnge N I Azm Elv MMA Mag Latit.  Longit.  #  S
    -----------------------------------------------------------------------------
    Sat 2001-12-22  5:07:15 298 66  527 A L 101 -23  S  -1  40.157  -74.826 34
    Sat 2001-12-22  5:07:15 298 66  527 A L 101 -23  S  -1     31.6 mi W    34
    Sat 2001-12-22  5:07:19 302 65  530 A L 101 -23  S   0  40.425  -74.804 34
    
    Sat 2001-12-22  5:08:43 342 41  699 A L 102 -22  R   2  39.143  -74.070 34
    Sat 2001-12-22  5:08:59 345 36  750 A P 102 -22  R  -3     11.6 mi E    34
    Sat 2001-12-22  5:09:18 348 32  809 A P 102 -22  R   2  40.975  -73.956 34
    -----------------------------------------------------------------------------
    
    The -1 magnitude solar panel flare is followed in less than two minutes
    by a -3 magnitude "normal" flare.
    
    
    Clear and dark skies!
       Ed Light
    
    Lakewood, NJ, USA
    N 40.1075, W 074.2312, +24 m (80 ft)
    
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