Update for (598) Octavia - October 2/3, 2005

  • Update computed by Jan Manek;   issued 28 Sep 2005 22:05 +0200 (CEST)

  • Jan Manek's update

                    IOTA/IOTA-ES occultation update for
            (598) Octavia / TYC 1353-01233-1 on October 2/3, 2005
                visible from NW Africa, NW Crete and S Turkey
    
    Summary 

    In the morning of night October 2/3, 2005 a faint 10.8 mag star TYC 1353-01233-1 will be occulted by a 75 km asteroid (598) Octavia. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~0.5 path width south shift with time ~0.1 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over NW Africa 3:05-3:07 UT, NW Crete ~3:07.7 UT and S Turkey ~3:08.5 UT. Please check the path chart for details.

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    The event at one glimpse:
     * date and approx. UT time of event: October 03, 2005 @ 03:08 UT (Europe)
     * magnitude of target star: 10.8
     * magnitude drop [mag]: 3.6
     * estimated maximum duration [s]: 3.7
     * approx. V mag of minor planet at event [mag]: 14.4
     * geocentric parallax of minor planet ["]: 4.053
     * apparent motion of minor planet ["/h]: 45.76
     * angular distance to moon, phase of moon [deg,%]: 80, 0%
     * Goffin's original chart reference: A05_1057
    
    The occultation path with path maps:
     * approximate ground width [km]: 270
     * uncertainty [path widths]: 1.2
     * 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 Gemini, about 1.7 degrees ESE of 4.0 mag star zeta Geminorum = SAO 79031.
       !!! 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 1353-01233-1
     * constellation: Gemini
     * J2000 position [h,m,s; o,',"]: 07h 10m 51.7953s; +19d 54' 03.091"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.016", 0.016"
     * V mag [mag]: 10.80 (averaged NSVS V-mag)
     * B-V [mag]: +0.66 (Tycho-2)
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (598) Octavia
         approx. diameter [km]: 75
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone)
         number of used observations: 127 USNO
         number of rejected observations: 0
         time covered by the observations: 1998 02 26 - 2004 10 16
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.154", 0.044", 82 deg
         remarks:
     * orbital elements
    	Semimajor axis     =   2.76058058622459
    	Eccentricity       =   0.249561326606370
    	Inclination        =  12.2358472366682 deg
    	Long. of node      =  91.9235952545695 deg
    	Arg. of pericenter = 291.3184635254821 deg
    	Mean anomaly       =  35.6282615470007 deg
    	Epoch of elements  : MJD   53646.13000000 TDT (Oct  3, 2005,  3.120000 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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