Update for (569) Misa - June 22/23, 2004

  • Update computed by Jan Manek;   issued 20 Jun 2004 18:14 +0200 (CEST)

  • Jan Manek's update

                         IOTA/IOTA-ES occultation update for
                 (569) Misa / TYC 6875-02039-1 on June 22/23, 2004
            visible from S Russia, NW Turkey, Greece, Tunisia and NW Africa
    
    Summary 

    In the night of June 22/23, 2004 a faint 11.3 mag star TYC 6875-02039-1 will be occulted by a 76 km asteroid (569) Misa. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~1" south shift compared to Eric Frappa's nominal prediction.

    Updated path runs over Africa ~23:35-23:42 UT. Please check the path chart for details.

    There exist more than 1" difference in position Tycho-2 vs. UCAC2. This update is based on UCAC2 position. Using Tycho-2 position gives path ~1.4 path width south of Frappa's nominal path, no time shift and ~0.4" uncertainty.

    Clear sky and good luck !!!

    The event at one glimpse:
     * date and approx. UT time of event: June 22, 2004 @ 23:38 UT (Africa)
     * magnitude of target star: 11.3
     * magnitude drop [mag]: 3.5
     * estimated maximum duration [s]: 6.0
     * approx. V mag of minor planet at event [mag]: 14.8
     * geocentric parallax of minor planet ["]: 4.154
     * apparent motion of minor planet ["/h]: 29.97
     * angular distance to moon, phase of moon [deg,%]: 140, 23%
     * Goffin's original chart reference: A04_XXXX
    
    The occultation path with path maps:
     * approximate ground width [km]: 95
     * uncertainty [path widths]: 1.7
     * uncertainty in time [s]: 14
     * 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.
    Elements for Tycho-2 position.
    
    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 N Sagittarius, about 3.0 degrees southeast of 2.9 mag star pi Sagittarii = SAO 187756.
       !!! 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 6875-02039-1
     * constellation: Sagittarius
     * J2000 position [h,m,s; o,',"]: 19h 19m 59.8243s; -22o 47' 29.526"
     * position source: UCAC2
     * estimated accuracy ["]: 0.04" (0.03", 0.03")
     * V mag [mag]: 11.32
     * B-V [mag]: +1.21
     * remarks: There exist more than 1" difference in position Tycho-2 vs. UCAC2.
       This update is based on UCAC2 position. Using Tycho-2 position gives path ~1.4 path width
       south of Frappa's nominal path, no time shift and ~0.4" uncertainty.
    
    Data for the minor planet:
     * general information:
         number, name: (569) Misa
         approx. diameter [km]: 44
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone)
         number of used observations: 84 USNO
         number of rejected observations: 0
         time covered by the observations: 1998 03 11 - 2003 06 07
         rms residuals ["] (RA,DE): 0.12", 0.12"
         estimated positional accuracy at epoch of event ["]: 0.11", 0.06"
         remarks:
    
    Path coordinates: click here
    
    Calculator(s): Jan Manek
    
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    Jan Manek
    Stefanik Observatory                Private :
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    118 46  Praha 1                     152 00  Praha 5 - Barrandov     |_|_|
    Czech Republic                      Czech Republic                  /   \
    Internet : jan.manek AT worldonline.cz                             |-O-O-|
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