Re: Geostationary Satellite Question

From: Tony Beresford (dberesford@adam.com.au)
Date: Mon Mar 17 2008 - 13:19:54 UTC

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    At 10:54 PM 17/03/2008, amstuart wrote:
    >Hi:
    >
    >I was imaging last evening north of NGC 1981. I 
    >am at 25.6554N, 80.3503W, imaging
    >20:04:11 to 20:10:01 EST on 3-16-08. I apologize 
    >that my graphics stink on YouTube (haven't quite 
    >mastered the 640 x 480 standard when making 
    >"slides"), but multiple geostationary satellite 
    >passes are shown (purple lines) transiting 
    >west-to-east at the time I was imaging.
    >
    >http://uk.youtube.com/watch?v=gZDpxeeEWPY
    >
    >My question is simply this: how can all of these 
    >satellites, whichever one I captured, be moving 
    >across my FOV? I thought  this type of satellite 
    >appeared to be hovering over one location? 
    >Software Bisque's TheSky planetarium software 
    >even shows the geostationary satellites moving via an animation in real time.
    >
    >Each of my CCD images were 10 seconds in 
    >duration, and I assembled an .avi clip to 
    >document the 6 minute transit over my 64 arc-minute FOV.
    Adam. you were tracking the stars. Geostationary 
    satellites are stationary with respect to the Earth's surface.
    If you turned off your drive, the geosat would 
    register as a point, and the stars as trails.
    Another new member of this group( Patrick 
    wiggins) just posted a couple of images taken this way  see:
    
    http://gallery.utahastronomy.com/main.php?g2_itemId=10620
    
    Tony Beresford
    
    
    
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