Update for (210) Isabella - October 3/4, 2005

  • Update computed by Jan Manek;   issued 28 Sep 2005 23:50 +0200 (CEST)

  • Jan Manek's update

                    IOTA/IOTA-ES occultation update for
            (210) Isabella / TYC 1850-01255-1 on October 3/4, 2005
           visible from NW Africa, S Italy, Serbia, Romania, Moldova,
                             Ukraine and Russia
    
    Summary 

    In the night of October 3/4, 2005 a faint 10.6 mag star TYC 1850-01255-1 will be occulted by a 90 km asteroid (210) Isabella. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~1 path width south shift with time ~0.1 minutes later compared to Edwin Goffin's nominal prediction.

    Updated path runs over NW Africa ~1:29-135 UT, S Italy ~1:37.0 UT, Serbia ~1:38.1 UT, Romania ~1:39.0 UT, Moldova ~1:39.9 UT, Ukraine ~1:40.6 UT and Russia ~1:42-1:46 UT. Please check the path chart for details.

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    Clear sky and good luck !!!

    The event at one glimpse:
     * date and approx. UT time of event: October 04, 2005 @ 01:40 UT (Europe)
     * magnitude of target star: 10.6
     * magnitude drop [mag]: 3.2
     * estimated maximum duration [s]: 12.0
     * approx. V mag of minor planet at event [mag]: 13.7
     * geocentric parallax of minor planet ["]: 4.821
     * apparent motion of minor planet ["/h]: 20.35
     * angular distance to moon, phase of moon [deg,%]: 119, 0%
     * Goffin's original chart reference: A05_1034
    
    The occultation path with path maps:
     * approximate ground width [km]: 100
     * uncertainty [path widths]: 1.1
     * uncertainty in time [s]: 22
     * 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:
       Target star is in east Taurus, about 4.6 degrees SW of 1.7 mag star beta TAuri = SAO 77168.
       !!! 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: TYC 1850-01255-1
     * constellation: Taurus
     * J2000 position [h,m,s; o,',"]: 05h 10m 20.4379s; +25d 39' 48.680"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.016", 0.025"
     * V mag [mag]: 10.63 (averaged NSVS V-mag)
     * B-V [mag]: +0.58 (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: 157 USNO
         number of rejected observations: 0
         time covered by the observations: 1998 03 03 - 2005 09 20
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.122", 0.046", 82 deg
         remarks:
     * orbital elements
    	Semimajor axis     =   2.72150889136317
    	Eccentricity       =   0.124372979378381
    	Inclination        =   5.2613476635099 deg
    	Long. of node      =  32.8580773547012 deg
    	Arg. of pericenter =  13.8465650322586 deg
    	Mean anomaly       =   7.2104588470491 deg
    	Epoch of elements  : MJD   53647.07000000 TDT (Oct  4, 2005,  1.680000 h)
    
    Path coordinates: click here
    
    Calculator(s): Jan Manek
    
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    Jan Manek
    Werichova 950
    152 00  Praha 5 - Barrandov                                         |_|_|
    Czech Republic                                                      /   \
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