RE: IR6 flare not predicted by Heavens-Above; IR5 observed

Date: Wed Aug 22 2001 - 08:32:20 PDT

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    Both IR5 and IR 51 passed close together on this pass, less than 2 minutes
    apart. This observation was, as noted below, that of IR 5---not IR 51. IR51
    was separately observed yesterday morning. It was indeed anomalous (as in
    the past) with slow variation to magnitude +3.5. So, the appearnces of these
    two vehicles seem to be more or less normal. 
    I suggested that Rob Matson look at this simply because Iridflar did not
    predict the -2 magnitude flare as being as bright as it actually was. It
    could also be that the attitude orientation of IR 6 is slightly off so as to
    create off-nominal flaring.
    -----Original Message-----
    From: Rod Sladen []
    Sent: Wednesday, August 22, 2001 10:18 AM
    To:; MALEY, PAUL D. (JSC-DO) (USA)
    Subject: Re: IR6 flare not predicted by Heavens-Above; IR5 observed
    Paul Maley ( wrote:
    > I saw a bright flare (about -2 magnitude) from Iridium 6 at 
    > 1039UT on 22 Aug. 01 from the site coordinates listed below. 
    > Lat. 29.6049N, Lon. 95.1069W, Alt. 6m
    > This flare was not predicted by H-A. 
    Iridflar predicts this flare as only mag. +1.9 which is fainter than the
    cut-off limit (mag.0).
    > IR 5 was also observed at 1026UT and there was no sign of any 
    > anomalous behavior.
    Or IR 51, whichever it really is! (presumably not flaring)
    Rod Sladen, Beeston, Nottinghamshire, UK
    52.9230N, 1.2190W
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