STS 134 MECO TLE

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Thu Apr 28 2011 - 22:00:04 UTC

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    STS 134 is scheduled for launch on 2011 Apr 29 at 19:47:52 UTC.
    
    I have not made an exhaustive check of visibility of the initial orbit from Europe, but at least the central part of the
    U.K. will have early evening twilight visibility. The external tank will be nearby the shuttle.
    
    As usual, NASA's MECO (main engine cut-off) 2-line elset is unreliable for predicting visibility on the first pass over
    Europe, so I have generated the following by converting NASA's True of Day Rotating (TDR) [aka Earth-Fixed Greenwich
    (EFG)] Cartesian state vector to SGP4, using Ken Ernandes' VEC2TLE program, and added realistic decay terms for the
    brief duration of existence of the orbit, from Apr 29, 19:58:21 UTC (MECO) to 20:26:47 UTC.
    
    NASA's state vector is found here:
    
    http://spaceflight1.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/orbit/SHUTTLE/SVPOST.html
    
         TDR Cartesian
     ----------------------
    X    =  2311414.38  m
    Y    = -4199507.45  m  
    Z    =  4368491.17  m
    XDOT =  4122.428165 m/s
    YDOT =  5472.172747 m/s 
    ZDOT =  3215.882981 m/s
    
    Vector Time (GMT): 2011/119/19:58:21.000
    
    This is the result of the VEC2TLE conversion:
    
    MECO                                                      57 X 230 km
    1 99134U          11119.83218750  .01000000  00000-0  44197-6 0    08
    2 99134  51.6442  49.6446 0132731 348.7614  69.0869 16.48578540    09
    
    Ted Molczan
    
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