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I Convert to "Of Date" Apparent coordinates from "J2000" coordinates

  1. Mar 28, 2016 #1
    How do you convert to "Of Date" or "Apparent" coordinates from "J2000" coordinates?

    The website:
    http://ssd.jpl.nasa.gov/horizons.cgi#results
    there are two options for displaying RA and DEC: Astrometric and Apparent. Astrometric is the J2000 coordinates and Apparent is the "Of Date".

    http://www.ephemeris.com/goto.php
    Just lists the Apparent

    www.stellarium.org software
    Lists both "Of Date" and J2000 coordinates.

    My question is: Is there a formula to convert between the two coordinate systems?
     
  2. jcsd
  3. Apr 2, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
  4. Apr 2, 2016 #3

    jim mcnamara

    User Avatar

    Staff: Mentor

    Short answer - what are you trying to do? Can you write programs in some language like maybe C or FORTRAN?
    I suppose you can use a sophisticated programmable TI calculator....
    @D H probably can help with a lot more detail - the JPL has software that does astronomical calculations. And copes with Jxxxx. AFAIK.

    Jan Meeus has several books meant for amateur astronomers. Please consider one of them as a great starting point.
    Exmple: https://www.amazon.com/Astronomical-Algorithms-Jean-Meeus/dp/0943396352

    As an aside - are you trying to project orbits of Solar System objects into the future? All of what I did was always okay with existing ephemera.
     
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