Update for (210) Isabella - November 27/28, 2005

  • Update computed by Jan Manek;   issued 20 Nov 2005 22:40 +0100 (CET)

  • Jan Manek's update

                      IOTA/IOTA-ES occultation update for
            (210) Isabella / HIP 22711 = SAO 76805 on November 27/28, 2005
          visible from Middle East, NE Egypt, N Tunisia, N Algeria and S Spain
    
    Summary 

    In the night of November 27/28, 2005 a bright 8.2 mag star HIP 22711 = SAO 76805 will be occulted by a 90 km asteroid (210) Isabella. This update is based on USNO/Flagstaff astrometry for the asteroid and Hipparcos star position.

    The updated path shows ~2.0 path width south shift with time ~0.4 minutes laterer compared to Edwin Goffin's nominal prediction.

    Updated path runs over Middle East ~0:19.8 UT, NE Egypt ~0:20.4 UT, N Tunisia ~0:23.6 UT, N Algeria ~0:24.5 UT and S Spain ~0:25.8 UT. Please check the path chart for details.

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    The event at one glimpse:
     * date and approx. UT time of event: November 28, 2005 @ 00:26 UT (Europe)
     * magnitude of target star: 8.2
     * magnitude drop [mag]: 4.3
     * estimated maximum duration [s]: 9.1
     * approx. V mag of minor planet at event [mag]: 12.5
     * geocentric parallax of minor planet ["]: 6.141
     * apparent motion of minor planet ["/h]: 34.31
     * angular distance to moon, phase of moon [deg,%]: 126, 14%
     * Goffin's original chart reference: A05_1138
    
    The occultation path with path maps:
     * approximate ground width [km]: 90
     * uncertainty [path widths]: 0.8
     * uncertainty in time [s]: 16
     * map: Overview
            European part
     * remarks: Path uncertainties [2 sigmas] are given according to nominal star
                position errors and expected asteroid positional accuracy.
    
    Elements for WinOccult - use 'Save as ...' to download and save these elements.
    
    Finding charts (prepared in GUIDE8):
     * occulted star is in center - labeled with cross
     * labeled stars have indicated SAO numbers
     * (smaller) square box shows 30' field in all wider field charts
     * (larger) square box shows 3° field in wide field charts
     * remarks:
       !!! IMPORTANT !!!
       Purple stars in identification chart are so called 'non-star' objects in GSC; in dense fields
       the 'non-stars' are often real stars or blends of close pairs. Be careful about this.
       40-degree chart
       3-degree chart
       0.5-degree chart
    
    Data for the target star:
     * name: HIP 22711 = SAO 76805 = PPM 93849 = TYC 1839-01639-1
     * constellation: Taurus
     * J2000 position [h,m,s; o,',"]: 04h 53m 00.8433s; +28d 06' 23.979"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.010", 0.012"
     * V mag [mag]: 8.23 (Hipparcos)
     * B-V [mag]: +0.56 (Tycho-2)
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (210) Isabella
         approx. diameter [km]: 90
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone)
         number of used observations: 162 USNO
         number of rejected observations: 0
         time covered by the observations: 1998 03 03 - 2005 11 03
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.148", 0.060", 81 deg
         remarks:
     * orbital elements
    	Semimajor axis     =   2.72146560771927
    	Eccentricity       =   0.124360878068926
    	Inclination        =   5.2613187783662 deg
    	Long. of node      =  32.8579211619894 deg
    	Arg. of pericenter =  13.8416792934755 deg
    	Mean anomaly       =  19.2779322596639 deg
    	Epoch of elements  : MJD   53702.02000000 TDT (Nov 28, 2005,  0.480000 h)
    
    Path coordinates: click here
    
    Calculator(s): Jan Manek
    
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    Jan Manek
    Werichova 950
    152 00  Praha 5 - Barrandov                                         |_|_|
    Czech Republic                                                      /   \
    Internet : jan.manek AT worldonline.cz                             |-O-O-|
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