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    Re: Any "on line" Star Position Computation available ?
    From: Antoine Couëtte
    Date: 2011 Jun 13, 04:54 -0700

    RE : http://www.fer3.com/arc/m2.aspx?i=116505
    [NavList] Re: Any "on line" Star Position Computation available ?
    From: navigationalalgorithms---com
    Date: 13 Jun 2011 09:05

    Hello Andr�s,

    Yes it looks like there might be no on-line full accuracy Star Apparent Position Web site. I would still not give up looking up and searching ...


    You mentioned the FK6 Catalog, and it brings me to the following point :

    Since the first HIPPARCOS Catalog in 1997, EASA published in 2007 a (higly) improved HIPPARCOS Catalog.

    See :

    http://heasarc.gsfc.nasa.gov/W3Browse/all/hipnewcat.html ,and also :


    where you can get the following very interesting free access article :

    A&A 474, 653-664 (2007)
    DOI: 10.1051/0004-6361:20078357
    Validation of the new Hipparcos reduction
    F. van Leeuwen

    Given the high accuracy achieved by the 2007 Improved Hipparcos Catalog, which to the best of my kowlegde is a main current data source for ICRS, I am no longer sure that FK6 can still be claimed to be the most accurate Star Catalog. Maybe FK6 still remains the best one for proper motions, but I would think that for plain 2000.0 RA & Dec values, HIPNEWCAT (i.e. Hipparcos 2007 Improved Catalog) probably gives us the very best data available to-day.

    Any "expert advice" on my previous thoughts here about this HIPNEWCAT / FK6 comparison ?

    and again ... any way to perform on-line super accurate Stars Apparent Positions computations ???

    Best Regards to all


    Antoine M. "Kermit" Cou�tte

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