RE: Noss 3-3 A appulse on Titan

From: Ted Molczan (molczan@rogers.com)
Date: Mon Mar 07 2005 - 00:20:47 EST

  • Next message: Greg Roberts: "Obs 04 March 2005"

    Steve Newcomb wrote:
    
    > 28537 05 004A   8539 G 20050307010304770 17 25 0728616+215545 38
    > 
    > I use ObsReduce for my reductions but it does not have 
    > Saturn's moon Titan, which is what I believe #28537 was right 
    > on at the above time. I'm not exactly sure of the correct 
    > coordinates for Titan, but it was observed to be on it.
    
    Attached is JPL's Horizons ephemeris of Titan, based upon which, I suggest this
    revision:
    
    28537 05 004A   8539 G 20050307010304770 17 25 0728659+215816 38
    
    Ted Molczan
    
    
    Ephemeris Generator
    
    Ephemeris Settings
    
          Target Body: Satellite Titan (SVI)
    Observer Location: User Specified Location
          Coordinates: 7920'19.7''W, 3928'14.5''N, 2753 ft
    
      From: A.D. 2005-03-07 01:00 UT
        To: A.D. 2005-03-07 01:05   
      Step: 1 minute
    Format: Calendar Date and Time
    
    Output Quantities: 1,9
     Ref. Frame, RA/Dec Format: J2000, HMS
    Apparent Coordinates Model: Airless
    
    HORIZONS Generated Ephemeris
    
    *******************************************************************************
    Ephemeris / WWW_USER Sun Mar  6 21:15:03 2005  Pasadena, USA     / Horizons    
    *******************************************************************************
    Target body name: Titan (606)                     {source: SAT192}
    Center body name: Earth (399)                     {source: DE-0406LE-0406}
    Center-site name: (User Defined Site)
    *******************************************************************************
    Start time      : A.D. 2005-Mar-07 01:00:00.0000 UT      
    Stop  time      : A.D. 2005-Mar-07 01:05:00.0000 UT      
    Step-size       : 1 minutes
    *******************************************************************************
    Center geodetic : 280.661200,    39.4707,     0.83{E-lon(deg),Lat(deg),Alt(km)}
    Center cylindric: 280.661200,  4930.9222,  4033.32{E-lon(deg),Dxy(km),Dz(km)}
    Center pole/equ : High-precision EOP model        {East-longitude +}
    Center radii    : 6378.1 x 6378.1 x 6356.8 km     {Equator, meridian, pole}    
    Target pole/equ : IAU_TITAN                       {East-longitude -}
    Target radii    : 2575.0 x 2575.0 x 2575.0 km     {Equator, meridian, pole}    
    Target primary  : Saturn                          {source: DE-0406LE-0406}
    Interfering body: MOON (Req= 1737.400) km         {source: DE-0406LE-0406}
    Deflecting body : Sun, EARTH                      {source: DE-0406LE-0406}
    Deflecting GMs  : 1.3271E+11, 3.9860E+05 km^3/s^2                              
    Atmos refraction: NO (AIRLESS)
    RA format       : HMS
    Time format     : CAL 
    RTS-only print  : NO       
    EOP file        : eop.050304.p050526                                           
    EOP coverage    : DATA-BASED 1962-JAN-20 TO 2005-MAR-04. PREDICTS-> 2005-MAY-25
    Units conversion: 1 AU= 149597870.691 km, c= 299792.458 km/s, 1 day= 86400.0 s 
    Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
    Table cut-offs 2: Solar Elongation (  0.0,180.0=NO )                           
    *******************************************************************************
     Date__(UT)__HR:MN     R.A._(ICRF/J2000.0)_DEC  APmag  S-brt
    ************************************************************
     2005-Mar-07 01:00     07 28 39.53 +21 58 09.6   8.23   7.58
     2005-Mar-07 01:01     07 28 39.52 +21 58 09.6   8.23   7.58
     2005-Mar-07 01:02     07 28 39.52 +21 58 09.6   8.23   7.58
     2005-Mar-07 01:03     07 28 39.51 +21 58 09.6   8.23   7.58
     2005-Mar-07 01:04     07 28 39.50 +21 58 09.5   8.23   7.58
     2005-Mar-07 01:05     07 28 39.50 +21 58 09.5   8.23   7.58
    *******************************************************************************
    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
    
    LUNAR PRESENCE WITH TARGET RISE/TRANSIT/SET MARKER
      The solar-presence symbol is immediately followed by another marker symbol:
    
            'm'  Refracted upper-limb of Moon on or above apparent horizon
            ' '  Refracted upper-limb of Moon below apparent horizon OR geocentric
            'r'  Rise    (target body on or above cut-off RTS elevation)
            't'  Transit (target body at or past local maximum RTS elevation)
            's'  Set     (target body on or below cut-off RTS elevation)
     
    RTS MARKERS (TVH)
      Rise and set are with respect to the reference ellipsoid true visual horizon
    defined by the elevation cut-off angle. Horizon dip and yellow-light refraction
    (Earth only) are considered. Accuracy is < or = to twice the requested search
    step-size.
     
     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)
     
     APmag S-brt =
       Target's approximate apparent visual magnitude & surface brightness. For
    planets and satellites, values are available only for solar phase angles in the
    range generally visible from Earth. This is to avoid extrapolation of models
    beyond their valid (data-based) limits.  Units: NONE & VISUAL MAGNITUDES PER
    SQUARE ARCSECOND
    
    
     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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