Update for (5) Astraea - October 10/11, 2005

  • Update computed by Jan Manek;   issued 29 Sep 2005 23:10 +0200 (CEST)

  • Jan Manek's update

                    IOTA/IOTA-ES occultation update for
            (5) Astraea / TYC 6336-01723-1 on October 10/11, 2005
          visible from N Africa, S Italy and Albania at low altitude
    
    Summary 

    In the night of October 10/11, 2005 a faint 10.4 mag star TYC 6336-01723-1 will be occulted by a 125 km asteroid (5) Astraea. 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 ~0.8 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over N Africa ~21:32 UT, S Italy ~21:33.8 UT and Albania ~21:34.0 UT at low altitude. 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 10, 2005 @ 21:34 UT (Europe)
     * magnitude of target star: 10.4
     * magnitude drop [mag]: 2.2
     * estimated maximum duration [s]: 18.0
     * approx. V mag of minor planet at event [mag]: 12.4
     * geocentric parallax of minor planet ["]: 3.327
     * apparent motion of minor planet ["/h]: 13.03
     * angular distance to moon, phase of moon [deg,%]: 15, 51%
     * Goffin's original chart reference: A05_1002
    
    The occultation path with path maps:
     * approximate ground width [km]: 190
     * uncertainty [path widths]: 0.77
     * 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:
       Target star is in west Capricornus, about 48' ESE of 5.2 mag star sigma Capricorni = SAO 163445.
       !!! 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 6336-01723-1
     * constellation: ACapricornus
     * J2000 position [h,m,s; o,',"]: 20h 22m 33.1273s; -19d 23' 56.436"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.020", 0.019"
     * V mag [mag]: 10.43 (averaged ASAS3 V-mag)
     * B-V [mag]: +1.21 (Tycho-2)
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (5) Astraea
         approx. diameter [km]: 125
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
         number of used observations: 176 USNO, 46 TMO
         number of rejected observations: 0
         time covered by the observations: 1997 05 31 - 2005 08 30
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.038", 0.032", 85 deg
         remarks:
     * orbital elements
    	Semimajor axis     =   2.57313800698401
    	Eccentricity       =   0.192929032151405
    	Inclination        =   5.3692667836527 deg
    	Long. of node      = 141.6900699813198 deg
    	Arg. of pericenter = 357.5322212999941 deg
    	Mean anomaly       = 183.4308294821346 deg
    	Epoch of elements  : MJD   53653.90000000 TDT (Oct 10, 2005, 21.600000 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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