DSP satellite launch tonight

From: Mike McCants (mmccants@io.com)
Date: Sat Nov 10 2007 - 18:22:53 UTC

  • Next message: Dale Ireland: "Rosetta"

    I posted:
    
    >The Centaur burn for 3 minutes at 22000 miles and the residual fuel and oxidizer
    >dump after payload separation should be visible as two naked-eye "comets" about
    >6+ hours after launch from the entire western hemisphere since this will occur
    >over the equator at longitude 90 west.
    
    The launch is scheduled for 01:39 UT (Nov 11).  The circularization burn
    would then be about 07:50 UT.  The fuel dump should be some time after 08:10 UT.
    (Or perhaps the Centaur will do a depletion burn.)  The IUS burn for DSP 22
    was estimated to be magnitude 1 from a dark sky.
    
    Here is the predicted GTO coast tle:
    
    DSP 23 GTO coast
    1 99991U          07315.12700000 0.00000000  00000-0  00000-0 0    00
    2 99991  26.6000 270.0000 7081000 353.0000   0.0000  2.19648000    03
    
    Predictions for Austin, TX:
    
      ***  2007 Nov 11  *** Times are UT ***
    
     Mag Hrs Min Alt Azi    Hgt  Range    R  A    Dec
      6.4  3  30  58 259   3410   3707  22  1.3  19.4
      6.4  3  35  72 249   4156   4252  23  9.4  22.4
      6.6  3  40  82 221   4896   4920   0  0.9  23.3
      6.9  3  45  83 162   5623   5640   0 39.7  23.2
      7.1  3  50  80 131   6333   6373   1  9.5  22.7
      7.3  3  55  76 120   7022   7100   1 33.1  22.0
      7.5  4   0  73 116   7690   7810   1 52.4  21.3
    Inside the Earth's shadow for about 95 minutes
      9.3  5  35  58 122  16909  17397   4  8.9  10.7
      9.6  6   5  59 128  18753  19241   4 28.1   8.4
      9.7  6  35  59 136  20200  20676   4 44.3   6.3
      9.9  7   5  60 145  21286  21751   4 58.6   4.2
      9.9  7  35  60 154  22034  22499   5 11.7   2.2
     10.0  7  45  60 157  22211  22680   5 15.9   1.6
     10.0  7  55  59 161  22353  22827   5 20.0   0.9
    
    Here is the predicted circular orbit tle:
    DSP 23 and Centaur
    1 99992U          07315.33000000 0.00000000  00000-0  00000-0 0    00
    2 99992   4.0000 285.0000 0001000 154.0000   0.0000  0.99965000    03
    
    Predictions for the Centaur for Austin, TX:
     Mag Hrs Min Alt Azi    Hgt  Range    R  A    Dec
     10.0  7  50  56 163  22292  22882   5 12.9  -2.9
     10.0  8   0  56 164  22292  22887   5 22.9  -3.1
    
    For the DSP 22 launch, the prediction was also for orbital circulization
    over longitude 90 west, but the observations indicated about 96 west.
    So there is a lot of uncertainty in these predictions.
    
    If the launch is delayed, the altitude and azimuth values will still
    be correct and the declination will still be correct, but the RA will
    be in error by the amount of the launch delay.
    
    The intrinsic magnitude for the Centaur should be about 3.0, but the
    DSP payload will probably be 2 or 3 magnitude fainter.
    
    Mike McCants
    
    -------------------------------------------------------------------------
    Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive:  
    http://www.satobs.org/seesat/seesatindex.html
    



    This archive was generated by hypermail 2b29 : Sat Nov 10 2007 - 18:34:38 UTC