Genesis predictions US West Coast

From: Tony Beresford (dberesford@adam.com.au)
Date: Fri Sep 03 2004 - 08:01:51 EDT

  • Next message: b_gimle@algonet.se: "Re: Genesis to return to Earth on Sep 8"

    Bruce Macdonald suggested US West Coast as a good observing position for seeing Genesis re-entry.
    This output of the HORIZONS system at JPL
    (URL below ) show a daylight pass in the North at elevations of around 20 degrees
    and ranges of about 225 Km. This phase isnt visible from Southern or Northern California
    as a check on Mt Palomar or San Francisco confirmed.
    A little checking with Atlas is needed for some place a little further North.
    Tony Beresford
    
    
    Currently cant get any later time than 15:53 UT
    or 08:53 PDT out of horizons.
    
    Ephemeris Generator
    
    Ephemeris Settings
    
         Target Body: Genesis Spacecraft
    Observer Location: Eugene, OR
         Coordinates: 12304'01.2''W, 4404'00.0''N
    
     From: A.D. 2004-09-08 15:00 UT
       To: A.D. 2004-09-08 15:53
     Step: 1 minute
    Format: Calendar Date and Time
    
    Output Quantities: 1,4,9,20,23
    Ref. Frame, RA/Dec Format: J2000, HMS
    Apparent Coordinates Model: Airless
    
    --------------------------------------------------------------------
    
    HORIZONS Generated Ephemeris
    
    *******************************************************************************
    Ephemeris / WWW_USER Fri Sep  3 04:44:44 2004  Pasadena, USA     / Horizons
    *******************************************************************************
    Target body name: Genesis Spacecraft (-47)        {source: Genesis_ref10_od106_de40}
    Center body name: Earth (399)                     {source: DE-0406LE-0406}
    Center-site name: (User Defined Site)
    *******************************************************************************
    Start time      : A.D. 2004-Sep-08 15:00:00.0000 UT
    Stop  time      : A.D. 2004-Sep-08 15:53:00.0000 UT
    Step-size       : 1 minutes
    
    ******************************************************************************************************************
    Date__(UT)__HR:MN     R.A._(ICRF/J2000.0)_DEC Azi_(a-appr)_Elev  APmag  S-brt         delta    deldot    S-O-T /r
    ******************************************************************************************************************
    
    2004-Sep-08 15:48 *m  23 30 29.98 +26 16 29.1 301.7844   5.4740   6.09   n.a.  0.0000198186 -10.02778 147.8918 /L
    2004-Sep-08 15:49 *m  23 35 06.62 +28 02 46.2 302.4155   7.3148   5.67   n.a.  0.0000157655 -10.18973 145.9611 /L
    2004-Sep-08 15:50 *m  23 40 34.85 +30 25 56.4 303.3729   9.7120   5.11   n.a.  0.0000116518 -10.32663 143.3762 /L
    2004-Sep-08 15:51 *m  23 48 08.21 +34 24 47.3 305.2302  13.5131   4.32   n.a.  0.0000074936 -10.39915 139.1291 /L
    2004-Sep-08 15:52 *m  00 06 58.96 +45 49 02.7 311.7194  23.7052   3.06   n.a.  0.0000033588 -10.04178 127.1779 /L
    2004-Sep-08 15:53 *t  11 12 00.67 +15 40 11.4  95.9629  28.8069   6.07   n.a.  0.0000015625   7.60125  10.2711 /T
    ******************************************************************************************************************
    Column meaning:
    
    TIME
    
     Prior to 1962, times are UT1. Dates thereafter are UTC. Any 'b' symbol in
    the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D.
    date. Calendar dates prior to 1582-Oct-15 are in the Julian calendar system.
    Later calendar dates are in the Gregorian system.
    
     The uniform Coordinate Time scale is used internally. Conversion between
    CT and the selected non-uniform UT output scale has not been determined for
    UTC times after the next July or January 1st.  The last known leap-second
    is used over any future interval.
    
     NOTE: "n.a." in output means quantity "not available" at the print-time.
    
    SOLAR PRESENCE
     Time tag is followed by a blank, then a solar-presence symbol:
    
           '*'  Daylight (refracted solar upper-limb on or above apparent horizon)
           'C'  Civil twilight/dawn
           'N'  Nautical twilight/dawn
           'A'  Astronomical twilight/dawn
           ' '  Night OR geocentric ephemeris
    
    
    R.A._(ICRF/J2000.0)_DEC =
      J2000.0 astrometric right ascension and declination of target. Corrected
    for light-time. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f)
    
    Azi_(a-appr)_Elev =
      Airless apparent azimuth and elevation of target. Corrected for light-time,
    the gravitational deflection of light, stellar aberration, precession and
    nutation. Azimuth measured North(0) -> East(90) -> South(180) -> West(270),
    elevation with respect to plane perpendicular to local zenith direction.
    TOPOCENTRIC ONLY. Units: DEGREES
    
    APmag S-brt =
      Target's approximate apparent visual magnitude & surface brightness. Planet
    & satellite values are available for Earth or Moon observing sites only. Values
    for the Sun, comets and asteroids ARE available for non-Earth sites.
    Units: NONE & VISUAL MAGNITUDES PER SQUARE ARCSECOND
    
    delta  deldot =
      Target apparent range ("delta") and range-rate ("delta-dot") relative to
    observer. Units: AU and KM/S
    
    S-O-T /r =
       Sun-Observer-Target angle; target's apparent solar elongation seen from
    observer location at print-time. If negative, the target center is behind
    the Sun. Angular units: DEGREES.
    
       The '/r' column is a Sun-relative code, output for observing sites
    with defined rotation models only.
    
            /T indicates target trails Sun (evening sky)
            /L indicates target leads Sun  (morning sky)
    
       NOTE: The S-O-T solar elongation angle is the total separation in any
    direction. It does not indicate the angle of Sun leading or trailing.
    
    Computations by ...
        Solar System Dynamics Group, Horizons On-Line Ephemeris System
        4800 Oak Grove Drive, Jet Propulsion Laboratory
        Pasadena, CA  91109   USA
        Information: http://ssd.jpl.nasa.gov/
        Connect    : telnet://ssd.jpl.nasa.gov:6775  (via browser)
                     telnet ssd.jpl.nasa.gov 6775    (via command-line)
        Author     : Jon.Giorgini@jpl.nasa.gov
    
    ******************************************************************************************************************
    
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    Last modified: 2004 August 21 19:12
    
    
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