Re: Iridium 90&91

From: Rod Sladen (
Date: Fri May 22 2009 - 09:08:35 UTC

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    gprichard <> wrote:
    > I recently noticed an anomaly in the identification numbers listed by
    > Heaven's Above and CalSky. Heaven's Above lists Iridium 90 as 2002-005A
    > and Iridium 91 as 2002-005B whereas CalSky lists Iridium 90 as 2002-005B
    > and Iridium 91 as 2002-005A. Which version is correct?
    After launch, 23272 2002-005A was labelled as Iridium 90 and 23273
    2002-005B was labelled as Iridium 91.
    However, Spacecom exchanged the labelling of Iridium 90 and Iridium 91
    on January 1, 2006.  This evidently addressed a long-standing
    mislabelling of these objects to bring the designations in line with
    those used by the operators of the Iridium system.
    There have been other such exchanges of names of members of the
    Iridium constellation at various dates. More information on my Iridium
    pages at
    I hope this is useful! ... Rod
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