Re: Iridium failure list

From: Rod Sladen (rodsladen@crosswinds.net)
Date: Thu Jan 11 2001 - 08:48:59 PST

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    Paul Maley wrote:
    
    > After seeing some discussion on the last, I thought it 
    > worthwhile to post my current list of failures. The following
    > Iridiums are failed and still in orbit (79, 85 decayed). 
    > There have been 15 apparent failures to date and one
    > partial failure:
    
    This is in agreement with my observations and my conclusions.
    
    > The partial failure is IR 51(25262). 
    
    Thank you for your conclusion on its "doubtful" status.
    
    > Plane 1 = IR 73 (25344)
    > Plane 2 = IR 24 (25105), 71 (25320), 69(25319), 48 (25107)
    > Plane 3 = IR 27(25947)
    > Plane 4 = IR 2(25527)
    > Plane 5 = IR 9(24838), 911(24842), 914(24836)
    > Plane 6 = IR 921(24873), 20(24871), 44(25078)
    
    Just a couple of points on the above list:
    
    IR 2(25527, 98066A) started out in plane 5, not plane 4.  It may well have been
    intended to drift it to another plane.  I had assumed that it was intended to
    go to plane 3 (which it has long since passed, of course).  Has anybody any
    definitive information on this?
    
    IR 24 is, surely, really (24905, 97043C) but is, of course,  identified and
    tracked by Spaccecom/OIG as (25105, 97082B), having "swapped identities" with
    IR 46.
    
    (24871, 97034C) is now identified by Iridium/Spacecom/OIG as "Iridium 920" rather
    than plain "Iridium 20".
    
    -- 
    Rod Sladen, Beeston, Nottinghamshire, UK, 52.923N, 1.219W
    
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