Re: Orange ISS !

From: Robert (rsmath@yahoo.com)
Date: Wed Oct 25 2006 - 05:43:45 EDT

  • Next message: David Brierley: "DMB Obs Oct 24"

    what kind of pass was it?  In rough terms, was the sun generally to your back with the ISS in front of you (or did the ISS pass happen between you and the sun?)  
    
    From passes before the second pair of solar arrays were added, I've seen it be a goldish or orangish color when it passes between me and the sun.  When the ISS passes with the sun at my back, it's brighter and whiter.  
    
    I am currently trying to figure out pass quality since the new solar array was added.  So far, I've concluded altitude of the pass plays more of a part than the general direction of the sun with regard to the observer.  In about 5 pass checks, the ISS is brighter when above 30 degs above the horizon and dimmer when below 30 degrees elevation.  I'm still adding to my knowledge base by watching passes when I can, but I've pretty much concluded if the pass is less than 30 deg elevation, it won't be a spectacular one if it is entirely or mostly below 30 deg elevation.
    
    my most memorable recent pass was a morning pass with the ISS coming out of shadow overhead (and fairly immediately becoming as bright as Venus) and then at about the 30 deg elevation mark on its way towards my horizon, it rapidly faded in magnitude.  The ISS turned from a white, bright color (venus-type magnitude) to a goldish color (as it faded to probably -1 or 0 magnitude).
    
    Robert
    
    ----- Original Message ----
    From: John Locker <john@satcom.freeserve.co.uk>
    To: SeeSat-L@satobs.org
    Sent: Tuesday, October 24, 2006 3:29:56 PM
    Subject: Orange ISS !
    
    Watching ISS tonight on a low elevation pass ( 37 degs .... 1828 gmt ) I was 
    amazed how orange it was ...and how bright .
    Quick glimpse here : 
    http://mysite.wanadoo-members.co.uk/satcom_transits/long.gif  at long range 
    .
    
    John 
    
    
    
    
    
    
    
    
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