Correction, clarification, observations

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Fri May 18 2001 - 01:39:02 PDT

  • Next message: Rik Hill: "Cosmos 1220 - FYI"

    Correction.  I wrote:
    
    > the highfly.mag file is for objects with mean motion of 2 or less.
    
    Actually, Highfly will process objects with mean motion less than 
    9 (nine) revolutions per day.  Quicksat processes only objects with 
    mean motion 4 or greater.  (So either program will give predictions
    for objects with mean motion 4 to 9.)  Mike notes in the Highfly 
    documentation that you can use the Quicksat.mag file with Highfly.
    
    Clarification.  I wrote:
    
    > I don't know how to calculate the theoretical magnitude from RCS 
    > and range.
    
    Well, I ought to, but anyway, Rob Matson wrote a full magnitude 
    equation for "a spherical satellite with a perfectly Lambertian 
    surface" in this message:
    
     http://www2.satellite.eu.org/seesat/Apr-2001/0313.html
    
    Observations.  Last night once more, NOSS 2-2 trio was one power,
    from the middle of the city.  During the part of the pass that I 
    saw they were fainter than the previous two reports, but I missed 
    the pre-culmination part of the pass due to being rudely 
    distracted by 00694 (63-047A, the oldest Atlas Centaur in orbit).  
    As the NOSS 2-2 trio were nearing one of the bright stars in the 
    south, a west-to-east satellite crossed just to the south of them.
    
    While watching Superbird A flash itself silly once again, a flock 
    of birds heading north crossed with it right about click #33!  
    Only a few minutes later our late-night low clouds came in on the 
    sea breeze from the Gulf of Mexico.
    
    Ed Cannon - ecannon@mail.utexas.edu - Austin, Texas, USA
    
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