Re: An ISS encounter with Venus and Saturn

From: Thomas Fly (thomasfly@j2ee-consultants.com)
Date: Sun Aug 22 2004 - 22:10:09 EDT

  • Next message: Tom Wagner: "Re: An ISS encounter with Venus and Saturn"

    I'd had Venus & Saturn encounters predicted also, but on different days, and at only about 10° elevation- you were
    rather lucky to have the ISS nearly draw an arc between the 2 planets!
    
    I got an update from the MCC Friday, but there was no corresponding update to the SVPOST.html page, so I didn't generate
    new reports:
    
    * ISS is currently in LVLH attitude mode.
    
    * ReBoost #2 is currently scheduled to occur on August 26.
    
                     USSPACECOM TWO LINE MEAN ELEMENT SET
    
    Current ISS - Post ReBoost #1
    
    1 25544U 98067A   04233.48945204  .00013499  00000-0  11213-3 0  9557
    2 25544  51.6323 357.4630 0008185 117.5236 242.6758 15.70277963  8422
    
    
    The Saturn encounter time should have been about day-of-year 235.40954; the earliest OIG TLE that I can retrieve right
    now is:
    
    1 25544U 98067A   04235.55862269  .00020882  00000-0  17158-3 0  5044
    2 25544  51.6338 346.8943 0008001 122.0645  63.3642 15.70367370328741
    
    I'd be interested to know how the MCC TLE compares in accuracy with that OIG TLE, as nearly as you can tell- and with
    the accuracy of the report I generated Thursday. I'd think that OIG's ultimate source of the ISS's orbit is USSPACECOM;
    evidently the MCC gets orbit data from the Russians sometimes, and USSPACECOM at other times.
    
    The report I generated Thursday would have used the following TLE:
    
    1 25544U 98067A   04235.08033384  .00020000  00000-0  20000-3 0  9035
    2 25544  51.6343 349.3397 0007690 120.1211 240.0713 15.70424603  8672
    
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