RE: NROL-26 search elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Sat Jan 17 2009 - 12:18:33 UTC

  • Next message: Alberto Rango: "4541 SATOBS 16 JAN 2008."

    The launch is scheduled for 2009 Jan 18 at 00:33 UTC; the window is 4 hours:
    
    http://www.spaceflightnow.com/delta/d337/status.html
    
    I am unlikely to be available during the first 2 or 3 hours of the launch
    window, so in the event of a launch later than 00:33 UTC, interested readers
    will need to rotate the search elements. The process is simple. For a delay of
    "m" minutes, add m/1440 to the epoch, and add m*0.25068447734 to the RAAN. If
    the new RAAN exceeds 360 deg, then subtract 360 deg. This applies to all three
    search elsets.
    
    Here are search elements for the scheduled launch time:
    
    LEO coast                                                258 X 272 km
    1 70501U          09018.04039352  .00000000  00000-0  00000-0 0    00
    2 70501  27.2800 303.8000 0010000 183.0000 359.3500 16.05000000    08
     
    GTO burn at 1st descending node                        278 X 36398 km
    1 70502U          09018.24879396  .00000000  00000-0  00000-0 0    03
    2 70502  27.2800 303.7200 7307000 182.9000 167.5000  2.23480000    05
     
    GTO burn at 1st ascending node                         278 X 36398 km
    1 70503U          09018.07108057  .00000000  00000-0  00000-0 0    04
    2 70503  27.2800 303.5600 7307000   3.4000 359.6000  2.23480000    09
    
    I now believe that the GTO burn is likely to occur at the first descending node,
    in which case the 70502 orbit will apply; a more detailed discussion is
    available here:
    
    http://satobs.org/seesat/Jan-2009/0096.html
    
    Ted Molczan
    
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