Update for (397) Vienna - October 5/6, 2005

  • Update computed by Jan Manek;   issued 29 Sep 2005 00:50 +0200 (CEST)

  • Jan Manek's update

                    IOTA/IOTA-ES occultation update for
            (397) Vienna / TYC 1768-00244-1 on October 5/6, 2005
        visible from Norway, S Sweden, W Poland, E Czechia, W Slovakia,
           E Austria, W Hungary, frm. Yugoslavia, S Italy and Africa
    
    Summary 

    In the night of October 5/6, 2005 a faint 11.3 mag star TYC 1768-00244-1 will be occulted by a 46 km asteroid (397) Vienna. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.

    The updated path shows no path shift with time ~0.7 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over Norway ~21:18.5 UT, S Sweden ~21:19.8 UT, W Poland ~21:21.6 UT, E Czechia ~21:22.5 UT, W Slovakia ~21:22.9 UT, E Austria ~21:23.0 UT, W Hungary ~21:23.4 UT, frm. Yugoslavia ~21:24.1 UT, S Italy ~21:25.8 UT and Africa. 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 05, 2005 @ 21:23 UT (Europe)
     * magnitude of target star: 11.3
     * magnitude drop [mag]: 1.2
     * estimated maximum duration [s]: 8.4
     * approx. V mag of minor planet at event [mag]: 12.0
     * geocentric parallax of minor planet ["]: 7.980
     * apparent motion of minor planet ["/h]: 24.69
     * angular distance to moon, phase of moon [deg,%]: 174, 6%
     * Goffin's original chart reference: A05_1044
    
    The occultation path with path maps:
     * approximate ground width [km]: 60
     * uncertainty [path widths]: 2.5
     * uncertainty in time [s]: 13
     * 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 middle Aries, about 7.8 degrees E of 2.0 mag star alpha Arietis = SAO 75151.
       !!! 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 1768-00244-1
     * constellation: Aries
     * J2000 position [h,m,s; o,',"]: 02h 41m 21.3523s; +23d 39' 40.105"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.016", 0.016"
     * V mag [mag]: 10.32 (averaged NSVS V-mag)
     * B-V [mag]: +0.47 (Tycho-2)
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (397) Vienna
         approx. diameter [km]: 46
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
         number of used observations: 150 USNO, 7 TMO
         number of rejected observations: 0
         time covered by the observations: 1998 02 17 - 2005 09 20
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.146", 0.064", 87 deg
         remarks:
     * orbital elements
    	Semimajor axis     =   2.63525554997861
    	Eccentricity       =   0.246524873764713
    	Inclination        =  12.8353183458666 deg
    	Long. of node      = 228.2684449082529 deg
    	Arg. of pericenter = 139.4299594889518 deg
    	Mean anomaly       =  12.7357187332869 deg
    	Epoch of elements  : MJD   53648.89000000 TDT (Oct  5, 2005, 21.360000 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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