Iridia cross the sky (was: ISS Misses Moon)

From: Denis V. Denissenko (
Date: Fri Jun 08 2001 - 10:56:48 PDT

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    Hello!  This is my first post to this list but some of you may already
    know me from sci.astro.satellites.visual-observe newsgroup.  I've been
    reading the List archives on the Web recently and thought I could try
    answering one question.
    Jonathan T Wojack ( wrote on Tue Jun 05 2001 - 07:32:00
    > I don't know if this is correct, but I was under the impression that
    > Iridia follow a "local orbital plane"; that is, they never appear in
    > certain sections of the sky (like the 8 planets).  Now that I think
    > it, I think I was mistaken.  Can anyone confirm?
    Here is the map I've just generated from my archives of Iridium
    As you can see, flare positions cover almost the whole sky more or
    less uniformly.  Map is centered at R.A.=12h00 (180 deg), Decl.=0
    deg.  There's a gap near the center (in the constellation of Leo), but
    exactly these days we're having flares in that very area of the sky.
    Moments are calculated for the point in Moscow with lat=55o45',
    If I dig up a little more in my archives, I will probably find visible
    pass chart of a flare within 2 (?) degrees from the Moon.  Don't
    remember the date right off.
    Denis Denissenko, M.Sci.
    Space Research Institute (IKI)
    Profsoyuznaya 84/32, 117810, Moscow, Russia
    Iridium Flares in Moscow this week:
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