Re: Light Curve from Satellite Trail

From: John Locker (john@satcom.freeserve.co.uk)
Date: Thu Jan 10 2008 - 11:34:16 UTC

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    You beat me to it Bob...I was going to suggest you might try an Iridium in 
    order to create a  reference image...after all flares fom iridium are 
    commonplace , but not so ISS.
    
    Great work
    
    John
    
    
    ----- Original Message ----- 
    From: "Bob Christy" <rdc@zarya.info>
    To: "'Seesat-L'" <SeeSat-L@satobs.org>
    Sent: Thursday, January 10, 2008 10:02 AM
    Subject: RE: Light Curve from Satellite Trail
    
    
    > Someone mailed a response suggesting that it might be interesting to see 
    > an
    > Iridium flare plotted.
    >
    > I don't have an image of my own but I selected one from the many available
    > on the Internet. To avoid any copyright/ownership issues, I will not
    > identify the original. The result is here:
    > http://www.zarya.info/Results/iridiumplot.jpg
    >
    > The curve is pretty symmetrical and it has spikes caused by stars on the
    > line of the trail. The flat top is caused by the image saturating around 
    > the
    > brightest point.
    >
    > Like the ISS curve, there is a step to the right on the peak but having
    > looked closely at the original image, it is a genuine feature in that the
    > rise and fall are not quite symmetrical. The step may be a processing
    > aretefact that can be avoided by more-careful processing than my quick
    > dabble.
    >
    > Bob Christy
    >
    >> -----Original Message-----
    >> From: Bob Christy [mailto:rdc@zarya.info]
    >> Sent: Wednesday, January 09, 2008 7:52 PM
    >> To: Seesat-L
    >> Subject: Light Curve from Satellite Trail
    >>
    >> As an experiment, I set out to derive a light curve from a
    >> trailed image of the ISS. It worked quite well:
    >> http://www.zarya.info/Tracking/ISS/20070812vis.php
    >>
    >> BobChristy
    >> Lincoln, UK
    >> 53.2233 deg North
    >> 0.6004 deg West
    >> Height 59m
    >
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