Re: J2000 TO TLE

From: Tony Beresford (
Date: Fri May 14 2004 - 05:01:32 EDT

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    At 17:23 14/05/04, wrote:
    >I'm looking for source code that will convert a vector from J2000 to a TLE
    >I would realy appreciate your help.
    Off the top of my head as the saying goes I cant provide source code, 
    but approximate formulae are mentioned on Page B19 of the Astronomical almanac
    to convert from  1. J2000 to middle of year,
                      2. middle of Year to date for mean equinox.
                      3.The approximate reduction for nutation is on page B20
    TLE angular co-ordinates are I understand in the frame of True Equinox of date.
    You may be able to finf source code from the USNO or the SOFIA code of the IAU
    Tony Beresford
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