Updated elements

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Mon Mar 16 2009 - 17:09:00 UTC

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    The following are based on observations by Scott Campbell, Greg Roberts and
    Peter Wakelin.
    
    The line following each element set states the duration of the underlying
    observational period, or "arc", and the WRMS (weighted average root mean square)
    residuals between the orbit and the observations; the smaller the value, the
    better. 
    
    Vortex 6                                             31737 X 39865 km
    1 19976U 89035A   09074.40943436  .00000000  00000-0  00000-0 0    03
    2 19976   5.8417  11.7410 0963465 220.4972 131.9860  1.00224436    02
    Arc 2009 Mar 13.84 - Mar 15.84, WRMS residuals = 0.002 deg
    
    USA 125 r2                                             398 X 14013 km
    1 23947U 96038C   09074.63640499  .00000193  00000-0  11201-3 0    06
    2 23947  55.3044 117.7149 5011768 260.6740  41.7145  5.48378168    03
    Arc 2009 Jan 23.94 - Mar 15.82, WRMS residuals = 0.015 deg
    
    SDS 3-1                                                697 X 39650 km
    1 25148U 98005A   09074.35034796  .00000000  00000-0  00000-0 0    02
    2 25148  64.5673 132.8956 7335368 250.5965  22.3944  2.00650349    07
    Arc 2009 Feb 14.00 - Mar 15.84, WRMS residuals = 0.014 deg
    
    USA 184                                               1234 X 39122 km
    1 29249U 06027A   09074.32460967  .00000000  00000-0  00000-0 0    01
    2 29249  63.1961 272.6001 7133731 273.5114  14.7266  2.00602621    05
    Arc 2009 Mar 02.81 - 15.78, WRMS residuals = 0.010 deg
    
    USA 202                                              35787 X 35940 km
    1 33490U 09001A   09074.28282996  .00000000  00000-0  00000-0 0    08
    2 33490   2.8921 338.2260 0018046 168.3548 191.6880  1.00001605    07
    Arc 2009 Mar 13.80 - 15.87, WRMS residuals = 0.005 deg
    
    Greg Roberts recovered USA 202 on Mar 13 UTC, after it failed to appear at the
    predicted location on Mar 12. Analysis reveals that it entered its present orbit
    on Mar 03 UTC, near apogee, with a manoeuvre that raised its perigee about 72
    km. As a result, its rate of westward drift nearly doubled, from 0.504 deg/d to
    0.977 deg/d. On Mar 15 UTC, it passed through 63 deg E. Its destination remains
    to be seen. One possibility is 44 E, near which two other GEO SIGINT satellites
    are active, Vortex 6 (89035A / 19976) and Advanced Orion 2 (98029A / 25336).
    
    08731A                                                2701 X 37657 km
    1 90082U 08731A   09074.27902199  .00000000  00000-0  00000-0 0    00
    2 90082  64.1476  68.2431 6581223 259.1848  25.7691  2.00590778    05
    Arc 2009 Mar 14.84 - 15.76, WRMS residuals = 0.007 deg
    
    Ted Molczan
    
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