USA 39 visibility

From: Matson, Robert (ROBERT.D.MATSON@saic.com)
Date: Thu Apr 13 2000 - 14:05:08 PDT

  • Next message: Mark A. Hanning-Lee: "Ir 43 & 21A, ISS 4/12 PDT"

    Hi James,
    
    Regarding USA 39, you wrote:
    
    > BTW: autostar "said" that it should be visable until 3:28??AM local time.
    > Does this sound about right?
    
    That depends on your location.  In southern California,
    the satellite is "visible" 24 hours a day, but further
    east it's elevation is low enough that it spends some
    of its orbit below the horizon.  However, from your
    location the satellite is always above the horizon.
    
    > We called it off at about 11PM local MDT as the air was really getting
    > heavy with dew.
    
    The flashes probably hadn't started yet -- probably
    more like 11:30pm MDT.
    
    > Tonight the humidity should be around 30%, skys clear, but with brighter
    > moon.  Should the element set still work?
    
    Yes -- the elset should get you within 0.5 degrees
    crosstrack, and I'd guess within a few minutes of
    right ascension.
    
    Good luck!  --Rob
    
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