RE: STS-107 observation

From: Ted Molczan (molczan@rogers.com)
Date: Sat Jan 25 2003 - 16:41:49 EST

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    Welcome to SeeSat-L, Robert!
    
    Your observation report is in excellent agreement with the shuttle's latest orbital elements.
    
    I estimate that it could have reached magnitude -3 on your pass.
    
    > It was noticeable that the map on the  NASA spaceflight beta 
    > tracker showed it over my location after I had  LOS, - could this could be 
    > owing to lag over the Internet?
    
    I have just checked the NASA spaceflight beta tracker, and found it running about 8 min late.
    
    My guess is that the tracker is using elements from NASA/OIG, most of which have orbital decay terms that are far too low. If they
    are using one of those elsets, and if it about one week old, that would account for the present 8 min error. The error will continue
    to grow until the old/erroneous elset is replaced with a better one.
    
    I suggest using the projected elsets provided here:
    
    http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/orbit/SHUTTLE/SVPOST.html
    
    This elset should be good for at least the next 24 hours:
    
    1 27647U 03003A   03026.20212533  .00189937  00000-0  37621-3 0  9013
    2 27647  39.0218 165.4368 0009615  76.3077 283.8971 16.00371539  1548
    
    Your pass of 26 Jan will be about 1 min earlier than that of 25 Jan:
    
    26/ 1/ 3  00:00 - 24:00 UTC  J2000.0  EL >  0  Robert Holdsworth
    STS 107        03003A   27647   Bull =  901    Robert Holdsworth
    SGP4  Age =    0.2 d  Unc =    0 s ( 50%) Src =31
    
      TIME      %I   Mvv    AZ  EL     R.A.       DEC      FE    VANG  RANGE   ALT
    --------    --  ----   ---  --   --------  ---------  ----   ----  -----  -----
    08:53:43    15   3.4   277   0   23:13:18   05:25:42   6.8   0.07   1950    290
    08:55:28    20   2.0   281   9   23:51:48   02:53:26   7.1   0.14   1222    290
    08:56:23    26   0.8   287  16   00:30:17   01:27:14   7.3   0.25    855    291
    08:56:53    32  -0.1   293  23   01:06:03   00:36:22   7.4   0.39    668    291
    08:57:12    39  -0.8   299  29   01:39:34   00:02:38   7.5   0.54    560    291
    08:57:26    45  -1.4   306  35   02:12:43  -00:22:10   7.7   0.70    490    291
    08:57:37    52  -1.8   315  40   02:45:21  -00:40:20   7.9   0.85    443    291
    08:57:46    58  -2.2   324  44   03:16:54  -00:53:02   8.1   0.98    412    291
    08:57:54    65  -2.5   334  47   03:48:31  -01:01:28   8.3   1.08    392    291
    08:58:01    70  -2.7   345  49   04:18:28  -01:05:46   8.6   1.15    380    291
    08:58:08    76  -2.9   356  50   04:49:43  -01:06:34   8.9   1.18    375    291
    08:58:14    80  -3.0     7  50   05:16:46  -01:04:18   9.2   1.18    376    291
    08:58:20    84  -3.0    17  49   05:43:21  -00:59:24   9.5   1.14    382    291
    08:58:27    88  -3.0    27  46   06:12:57  -00:50:49   9.7   1.07    394    291
    08:58:34    91  -3.0    36  44   06:40:21  -00:39:52   9.9   0.98    413    291
    08:58:42    94  -2.9    44  40   07:08:28  -00:25:27  10.1   0.86    440    291
    08:58:51    96  -2.8    51  36   07:35:57  -00:07:57  10.3   0.74    477    291
    08:59:01    97  -2.6    57  32   08:01:43   00:11:57  10.4   0.61    525    290
    08:59:13    98  -2.3    62  27   08:27:01   00:35:32  10.5   0.49    589    290
    08:59:14 EP 98  -2.3    63  27   08:29:27   00:38:04  10.5   0.48    596    290
    08:59:25 EU 98  -2.1    66  24   08:46:58   00:57:45  10.6   0.40    656    290
    
    
    
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    This archive was generated by hypermail 2b29 : Sat Jan 25 2003 - 16:52:28 EST