Iridium 84 being raised

From: Rod Sladen (rodsladen@crosswinds.net)
Date: Sat Jan 06 2001 - 11:50:40 PST

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    A recent elset shows that Iridium 84 is being raised, presumably to fill the
    gap left by the failed Iridium 9
    
    IRIDIUM 84
    1 25530U 98066D   01005.63685683 -.18147655  00000-0 -55546+1 0  1485
    2 25530  86.5376 340.1197 0002257 311.1302  49.0069 14.51006879116045
    
    A slightly earlier elset is from prior to the manouver:
    
    IRIDIUM 84              
    1 25530U 98066D   01005.02098629  .00002830  00000-0  51157-3 0  1476
    2 25530  86.5893 340.3425 0002820  96.2437 263.9092 14.66094639115950
    
    So, soon, there should once again be a complete constellation.
    
    That Iridium 84 has been chosen seems somewhat of a surprise.  It has not been
    regularly manouvered to maintain its orbit in the past.  I have only one note
    of it being manouvered in the recent past - back in September when its orbit
    was raised.  See http://www2.satellite.eu.org/seesat/Sep-2000/0303.html
    
    
    This is in contrast to Iridium 86 (also spare in the same orbital plane), of
    which the orbit has been regularly maintained, along with (in other planes)
    Iridiums 77, 82 and (in recent months) 14(a), 20(a) and 21(a).
    
    That makes 7 spares which are being maintained.  At the Iridium Satellite LLC
    press conference In December 2000 (see   http://www.ee.surrey.ac.uk/Personal/L.Wood/constellations/iridium/conference-call-Dec-2000.html),
    a figure of 8 operational spares was quoted.  So which is the other operational
    spare?
    
    -- 
    Rod Sladen, Beeston, Nottinghamshire, UK, 52.923N, 1.219W
    
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