Flashing GPS?

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Sat Sep 10 2005 - 13:19:31 EDT

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    The message below appeared on the sci.astro.satellites.visual-observe
    newsgroup in the last day or so.  I hope the author won't mind me 
    quoting it here.  I don't usually have GPS elements and am short of
    time today and so hope someone else may be able to confirm it.
    Ed C.
    >On Sep 6th at 21:57 UT when I was looking at the North America 
    >Nebula with an 8 inch reflector and O-III filter I noticed an 
    >object that was flashing about every 4th second from invisible 
    >to maybe 9th magnitude.  It was moving very slowly in the field 
    >maybe 0.5 degree/minute westwards. It was pretty cool and 
    >confirmed by three other observers. I pretended it was a pulsar 
    >in the nebula :)
    >What satellite did I see? From using the NASA JTrack 3D simulator 
    >I think it could be maybe GPS BIIA-25 (also named USA 117, Navstar 
    >2A-25, GPS 33). It has a period of ~12 hours. My position was 
    >latitude +57.58 north and latitude +12.62 east (Sweden).
    >Roger Persson
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