Update for (100) Hekate - October 12/13, 2005

  • Update computed by Jan Manek;   issued 10 Oct 2005 23:58 +0200 (CEST)

  • Jan Manek's update

                      IOTA/IOTA-ES occultation update for
             (100) Hekate / TYC 0649-00346-1 on October 12/13, 2005
         visible from Russia, SE Belarus, NW Ukraine, SE Poland, Slovakia,
              SE Austria, NW Slovenia, N Italy, SE France and Spain
    
    Summary 

    In the night of October 12/13, 2005 a faint 10.9 mag star TYC 0649-00346-1 will be occulted by a 92 km asteroid (100) Hekate. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~1.0 path width north shift with time ~0.3 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over Russia ~0:27-0:30 UT, SE Belarus ~0:30.5 UT, NW Ukraine ~0:30.9 UT, SE Poland ~0:31.3 UT, Slovakia ~0:31.7 UT, SE Austria ~0:32.2 UT, NW Slovenia ~0:32.4 UT, N Italy ~0:33.0 UT, SE France ~0:33.5 UT and Spain ~0:35.0 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 13, 2005 @ 00:32 UT (Europe)
     * magnitude of target star: 10.9
     * magnitude drop [mag]: 1.6
     * estimated maximum duration [s]: 9.5
     * approx. V mag of minor planet at event [mag]: 12.2
     * geocentric parallax of minor planet ["]: 4.222
     * apparent motion of minor planet ["/h]: 22.98
     * angular distance to moon, phase of moon [deg,%]: 89, 75%
     * Goffin's original chart reference: A05_1021
    
    The occultation path with path maps:
     * approximate ground width [km]: 120
     * uncertainty [path widths]: 1.1
     * uncertainty in time [s]: 17
     * 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 W Cetus, about 1.5 degrees W of 3.6 mag star omicron Tauri = SAO 111172.
       !!! 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 0649-00346-1
     * constellation: Cetus
     * J2000 position [h,m,s; o,',"]: 03h 18m 44.7195s; +08d 45' 13.004"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.019", 0.025"
     * V mag [mag]: 10.90 (averaged ASAS3 V-mag)
     * B-V [mag]: +1.17 (Tycho-2)
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (100) Hekate
         approx. diameter [km]: 92
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone)
         number of used observations: 174 USNO
         number of rejected observations: 0
         time covered by the observations: 1998 03 01 - 2005 09 25
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.090", 0.042", 72 deg
         remarks:
     * orbital elements
    	Semimajor axis     =   3.09380061427824
    	Eccentricity       =   0.164897074162232
    	Inclination        =   6.4295095747951 deg
    	Long. of node      = 127.3447792361536 deg
    	Arg. of pericenter = 185.9085526106437 deg
    	Mean anomaly       =  68.0402351857218 deg
    	Epoch of elements  : MJD   53656.02000000 TDT (Oct 13, 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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