Update for (1712) Angola - August 14/15, 2004

  • Update computed by Jan Manek;   issued 08 Aug 2004 19:44 +0200 (CEST)

  • Jan Manek's update

                         IOTA/IOTA-ES occultation update for
             (1712) Angola / TYC 2251-00099-1 on August 14/15, 2004
      visible from S Norway in strong twilight, S Iceland, S Greenland and Canada
    
    Summary 

    In the night of August 14/15, 2004 a bright 9.5 mag star TYC 2251-00099-1 will be occulted by a 66 km asteroid (1712) Angola. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.

    The updated path shows large ~11 path width north shift with time ~3.0 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over S Norway in strong twilight ~3:39.2 UT, S Iceland ~3:42.5 UT, S Greenland ~3:45 UT and Canada. 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: August 15, 2004 @ 03:39 UT (Europe)
     * magnitude of target star: 9.5
     * magnitude drop [mag]: 5.9
     * estimated maximum duration [s]: 8.7
     * approx. V mag of minor planet at event [mag]: 15.4
     * geocentric parallax of minor planet ["]: 3.707
     * apparent motion of minor planet ["/h]: 15.88
     * angular distance to moon, phase of moon [deg,%]: 121, 1%
     * Goffin's original chart reference: A04_0834
    
    The occultation path with path maps:
     * approximate ground width [km]: 85
     * uncertainty [path widths]: 1.6
     * uncertainty in time [s]: 21
     * 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 Pegasus, about 8.5 degrees SW of 2.0 mag star alpha Andromedae = SAO 73765.
       !!! 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 2251-00099-1
     * constellation: Pegasus
     * J2000 position [h,m,s; o,',"]: 23h 38m 25.4542s; +23o 48' 18.551"
     * position source: UCAC2
     * estimated accuracy ["]: 0.03" (0.02", 0.02")
     * V mag [mag]: 9.50
     * B-V [mag]: +1.47
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (1712) Angola
         approx. diameter [km]: 66
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
         number of used observations: 116 USNO, 16 TMO
         number of rejected observations: 0
         time covered by the observations: 1998 07 08 - 2004 08 05
         rms residuals ["] (RA,DE): 0.08", 0.06"
         estimated positional accuracy at epoch of event ["]: 0.08", 0.05"
         remarks:
     * orbital elements
    	Semimajor axis     =   3.17549357575608 AU
    	Eccentricity       =   0.145511488302468
    	Inclination        =  19.3284705283524 deg
    	Long. of node      = 237.8963860887984 deg
    	Arg. of pericenter =  18.2253179551130 deg
    	Mean anomaly       =  77.8693299718970 deg
    	Epoch of elements  : MJD   53232.15000000 TDT (Aug 15, 2004,  3.600000 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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