Some errors in Heavens Above's prediction on Iridium Flares

From: Shea (astronomy@citiz.net)
Date: Wed Jul 31 2002 - 04:17:58 EDT

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    Hi all,
    
      Recently, I've found something wrong in Heavens Above's prediction on
    Iridium Flares. My location is Shanghai, China. Latitude is 31°.222(N),
    and Longitude is 121°.458(E). Yesterday, Heavens Above gave me the
    Iridium Flares prediction: ______________________
    Date: 30 Jul
    Local Time: 19:40:07 (11:40:07 UT)
    Time Intensity ( Mag): -6
    Alt. : 63°
    Azimuth: 101° (ESE)
    Distance to flare centre: 6.0 km (E)
    Intensity at flare centre(Mag.) : -8
    Satellite: Iridium 19
    _____________________
    
    Most of them are right, but the Alt. is wrong. The observation is that
    Alt. is nearly 90°. The error is roughly 30°, so great! I noted the
    prediction on another Iridium Flare was wrong at Alt. a few days ago,
    and the error was also 30°. 
    
    Here, I wanna know whether somebody else has noted this problem and has
    some solution. Thanks!
    
    Best wishes!
    Clear Skies!
    
    Shea
    
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