Update for (444) Gyptis - April 26/27, 2004

  • Update computed by Jan Manek;   issued 20 Apr 2004 22:14 +0200 (CEST)

  • Jan Manek's update

                         IOTA/IOTA-ES occultation update for
                  (444) Gyptis / TYC 0788-01194-1 on April 26/27, 2004
                 visible from N Morocco, Algeria, S Tunisia and N Lybia
    
    Summary 

    In the night of April 26/27, 2004 a faint 10.9 mag star TYC 0788-01194-1 will be occulted by a 161 km asteroid (444) Gyptis. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~3.5 path width south shift with time ~0.5 minutes later compared to Edwin Goffin's nominal prediction.

    Updated path runs over N Morocco ~22:35.5 UT, Algeria ~22:35.7 UT, S Tunisia ~22:35.8 UT and N Libya ~22:35.9 UT. Please check the path chart for details. No chance for Europe.

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    Clear sky and good luck !!!

    The event at one glimpse:
     * date and approx. UT time of event: April 26, 2004 @ 22:35 UT (N.Africa)
     * magnitude of target star: 10.9
     * magnitude drop [mag]: 3.1
     * estimated maximum duration [s]: 8.4
     * approx. V mag of minor planet at event [mag]: 13.9
     * geocentric parallax of minor planet ["]: 2.824
     * apparent motion of minor planet ["/h]: 30.56
     * angular distance to moon, phase of moon [deg,%]: 14, 42%
     * Goffin's original chart reference: A04_0432
    
    The occultation path with path maps:
     * approximate ground width [km]: 180
     * uncertainty [path widths]: 0.5
     * uncertainty in time [s]: 5
     * map: Overview
            African 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 southwest Cancer, about 4.7 degrees NW of 3.5 mag star beta Cancri = SAO 116569.
       Only 2' NNE of target is double star ROE32 (10.3+10.9mag; separation ~9" at PA 294).
       !!! 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 0788-01194-1
     * constellation: Cancer
     * J2000 position [h,m,s; o,',"]: 08h 00m 20.4006s; +11o 35' 44.495"
     * position source: UCAC2
     * estimated accuracy ["]: 0.03" (0.02", 0.02")
     * V mag [mag]: 10.93
     * B-V [mag]: +1.21
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (444) Gyptis
         approx. diameter [km]: 161
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
         number of used observations: 138 USNO, 30 TMO
         number of rejected observations: 0
         time covered by the observations: 1997 05 30 - 2004 03 29
         rms residuals ["] (RA,DE): 0.08", 0.11"
         estimated positional accuracy at epoch of event ["]: 0.03", 0.03"
         remarks:
    
    Path coordinates: click here
    
    Calculator(s): Jan Manek
    
    ----------------------------------------------------------------------------
    Jan Manek
    Stefanik Observatory                Private :
    Petrin 205                          Werichova 950
    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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