RE: ISS solar transit on 4-15-03

From: Ted Molczan (molczan@rogers.com)
Date: Mon Apr 14 2003 - 19:07:40 EDT

  • Next message: Tom Wagner: "Re: ISS solar transit on 4-15-03"

    Ralph McConahy wrote:
    
    > Using this TLE from the NASA ISS web site:
    > 
    > ISS
    > 1 25544U 98067A   03105.53106156  .00041100  00000-0  34010-3 0  9050
    > 2 25544  51.6352 334.9570 0006812  21.4703 338.6736 15.58205811 11238
    > 
    > The ISS will indeed cross the Sun's disk, but about 9-seconds 
    > earlier than you predict (17:35:57 UT).
    
    Those elements are now out of date, which explains the 9 s difference.
    
    These two are now the closest ones to the time of the transit on the ISS site:
    
    http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/or
    bit/ISS/SVPOST.html
    
    1 25544U 98067A   03105.27461242  .00041100  00000-0  34010-3 0  9017
    2 25544  51.6329 336.2421 0006040  22.0682 338.0732 15.58140717 11196
    
    1 25544U 98067A   03106.30077509  .00041100  00000-0  34010-3 0  9022
    2 25544  51.6329 331.0947 0006072  25.1974 334.9476 15.58180419 11356
    
    Or, you can use the latest USSTRATCOM product, issued via NASA/OIG:
    
    1 25544U 98067A   03104.78447162  .00011195  00000-0  15207-3 0  8924
    2 25544  51.6336 338.6980 0006712  19.3333 109.6182 15.58131185251116
    
    Note that the elsets on the ISS site are accurate conversions from the ISS
    Flight Dynamics Officer's predicted elements - except for the decay terms -
    which are almost never updated. As long as you use an elset within a day or so
    of the event, the error will be small. 
    
    Ted Molczan
    
    
    
    
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