FW: [IOTAoccultations] Phobos-Soil ephemeris extended on JPL Horizons site

From: Derek C Breit (breit_ideas@poyntsource.com)
Date: Thu Oct 13 2011 - 15:22:55 UTC

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    Subject: [IOTAoccultations] Phobos-Soil ephemeris extended on JPL Horizons
    site
    
      
    Disregard my comments about limitations on the end time for input on the JPL
    Horizons Web site for the Phobos-Soil spacecraft given in my last message;
    topocentric ephemerides can now be generated for many days after launch.
    
    David
    ______
    
    Jon Giorgini wrote:
    
    >Is it possible to extend the trajectory file? The spacecraft may be 
    >visible to optical telescopes for another 3 days or so after launch.
    
    Natan,
    
    Disregard this request, it is no longer necessary. Boris pointed me to
    "phsrm_111109_111109_120910_nom3.bsp", which extends the trajectory
    prediction to 2012 and Mars arrival.
    
    The extension was just installed in Horizons.
    
    Regards,
    ----------------------------------------------------------
    Jon Giorgini | Navigation & Mission Design Section
    Senior Analyst | Solar System Dynamics Group
    Jon.Giorgini@jpl.nasa.gov | Jet Propulsion Laboratory
    ----------------------------------------------------------
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