Re: Problems with J002E3 elements

From: Ed Davies (edavies@nildram.co.uk)
Date: Sat Mar 29 2003 - 19:31:39 EST

  • Next message: Bob King: "Re: J002E3 elements- thank you!"

    "Björn Gimle" wrote:
    > 
    > "...J002E3 Elements in TLE form:
    > 1 99999U 99999A   03 84.00000000 -.00000000 +00000-0 +00000-0 0 00010
    > 2 99999  25.3923  10.1760 3728026 257.3057 298.1392  0.01771572000007
    >
    > ....
    > 
    > SkyMap gives from Earth Centre at 30 Mar 00 UT 13:28 -5 32' range 474280
    > km
    
    For a geocentric observer Horizons gives:
    
    2003-Mar-30 00:00     13 31 58.26 -06 05 03.3 13 32 08.66 -06 06 07.1
    
    Range converted from AUs, 480801 km.
    
    First RA/Dec pair is ICRF/J2000.0 with which I'm quite happy.  Second is
    "a-apparent".  What does this mean and why is it different?  I turned off 
    refraction correction so the difference is not just that.  (Refraction 
    correction seemed a bit pointless with 6000+km of rock in the way. :-)  
    
    Is it due to nutation, etc: i.e., relative to the ITRF (terrestrial
    reference frame) rather than celestial?
    
    I forwarded John Holtz's message to somebody with a decent tele-
    scope and a web-cam modded for long exposures a few days ago when it
    looked possible that a front might clear the air here in south eastern
    England but actually we've gone from high pressure haze to quite 
    heavy mist so I'm not too hopeful of him getting any piccies.
    
    Ed Davies.
    
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