Flaring Geosats and PPAS Reports

From: Jeff Umbarger (jumbarger2000@yahoo.com)
Date: Thu Oct 25 2007 - 23:34:10 EDT

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    Hey All,
         Continuing on Brad and Bram's thread on PPAS
    reports and how to deal with flaring geosats:
    I would like to state that I think it is a great idea
    to develop a type of reporting system for flaring
    geosats. They are clearly not the same class of object
    as those reported in PPAS reports, but are still
    spectacular. The reason why I would like see people
    record the flaring of these objects is for one simple
    reason: If geosats behaved the way I have modeled
    them, then we should *never* see them flare! Either
    the earth's shadow would block optimum flaring or when
    the "purple dot" is exposed, the sun-geosat-observer
    angle in non-optimum. However...we all can see these
    things perform spectacular flaring for minutes (not
    seconds) at a time. Why??? I don't know - it may have
    something to do with the geosat solar arrays tracking
    the longitudinal centerline (fixed motor speed) of the
    sun's analemma vs. the sun's actual RA (variable motor
    speed) or something like this. However, if everyone
    who took the time to observe these special objects,
    recorded the date and time of maximum flaring then I
    or someone smarter could determine the normal vector
    of the geosat solar arrays at that time and,
    therefore, be able to *predict* when the geosat would
    flare again and for who. Perhaps this kind of data
    could be obtained from the geosat operators. Either
    way, I would love to have a type of "Iridium Flare"
    calculator for these objects. Remember, if you can
    predict them, then you can photograph them.
         BTW, I've further enhanced my Geosat Flare
    Calculator to now predict the western (eclipsing) and
    eastern(uneclipsing) edge of the earth's shadow in RA
    for any moment in time, as well as the "purple dot"
    location and it's rise and set times. I'll post again
    when February 2008 season starts.
              Jeff Umbarger
              Plano, TX, USA
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