RE: TLE based on Az-El data

From: Ted Molczan (
Date: Mon Aug 09 2004 - 22:12:11 EDT

  • Next message: Tony Beresford: "Re: TLE based on Az-El data"

    Daniel Deak wrote:
    > I have a question though. Is there a program that use this 
    > kind of data [azimuth and elevation] directly to calculate
    > an orbit and generate TLE. To know if my efforts will be
    > worth the time and money, I'm asking if analysts prefer to
    > use AD-dec data instead of Az-El or if any format is OK for
    > all analysts.
    Here is some of what Dr. Desmond King-Hele wrote about using a theodolite, on
    page 101 of the 1983 edition of Observing Earth Satellites:
    "The accuracy of theodolite observations depends greatly on the quality of the
    instrument and the mounting, as well as the skill and assiduity of the observer.
    Great care has to be taken over the levelling of the instrument, and a concrete
    emplacement is advisable. The accuracy should be checked by taking readings on
    known stars -- their azimuth and elevation have to be calculated. But if the
    emplacement, the instrument and the calibrations are satisfactory, a good
    theodolite observer can do as well as a star background observer."
    As you may know, the UK and IOD formats include support for az/el:
    If you use one of those two standard formats, then I will modify my software to
    read their az/el formats.
    Ted Molczan
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