Re: Iridium 51 orbit adjustment

From: Rod Sladen (rodsladen@crosswinds.net)
Date: Mon Jan 29 2001 - 01:54:15 PST

  • Next message: Rainer.Kresken@esa.int: "Re: Flaring Geosats"

    I wrote:
    
    > This would seem to indicate that Iridium 51 is definitely 
    > regarded as a spare, in which case Iridium 2, Iridium 69 and 
    > Iridium 73 are, by elimination, confirmed as failed.
    
    Bjoern Gimle (b_gimle@algonet.se) responded:
    
    > No, this does not eliminate any of the above mentioned. 
    > Ir51 is in an engineering orbit with RAAN=300 deg. near 
    > epoch 01024. - the others were at 215, 238 and 205 deg. at 
    > the time, ie about two planes away!
    
    My starting point was the Iridium Satellite statement in December that there
    were 8 functional spares.  Six of these (Iridium 77, 82, 86, 20 ("new"), 14
    ("new") and 21 ("new")) were quickly identified because of regular orbital adjustments.
    Iridium 84 (now operational) made seven, and the Iridium 51 adjustment confirms
    that as the eighth.
    
    Hence my statement that Iridium 2, Iridium 69 and Iridium 73 are, by elimination,
    confirmed as failed.  Incidentally, I have it on good authority that these *are*
    all failures, at least in operational terms.  That does not mean that they may
    not flash or flare at times - see discussions in other threads.
    -- 
    Rod Sladen, Beeston, Nottinghamshire, UK, 52.923N, 1.219W
    
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