Update for (554) Peraga - March 8/9, 2004

  • Update computed by Jan Manek;   issued 28 Feb 2004 18:13 +0100 (CET)

  • Jan Manek's update

                         IOTA/IOTA-ES occultation update for
                   (554) Peraga / TYC 0829-00848-1 on March 8/9, 2004
              visible from India, Saudi Arabia, N Egypt, NE Libya, N Tunisia,
                        NE Algeria, S Spain and middle Portugal
    
    Summary 

    In the night of March 8/9, 2004 a bright 9.8 mag star TYC 0829-00848-1 will be occulted by a 99 km asteroid (554) Peraga. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~0.5 path width north shift with time 0.2 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over India around 21:01 UT, Saudi Arabia around 21:07 UT, N Egypt ~21:09.5 UT, NE Libya ~21:11.0 UT, N Tunisia ~21:13.1 UT, NE Algeria ~21:13.6 UT, S Spain ~21:15.0 UT and middle Portugal ~21:15.7 UT. Please check the path chart for details.

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    The event at one glimpse:
     * date and approx. UT time of event: March 8, 2004 @ 21:15 UT (Europe)
     * magnitude of target star: 9.8
     * magnitude drop [mag]: 2.5
     * estimated maximum duration [s]: 11.3
     * approx. V mag of minor planet at event [mag]: 12.2
     * geocentric parallax of minor planet ["]: 6.345
     * apparent motion of minor planet ["/h]: 31.27
     * angular distance to moon, phase of moon [deg,%]: 45, 96%
     * Goffin's original chart reference: A04_0326
    
    The occultation path with path maps:
     * approximate ground width [km]: 110
     * uncertainty [path widths]: 0.4
     * uncertainty in time [s]: 7
     * map: Overview
            Asian part
            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 southwest Leo, about 4.0 degrees southwest of 1.4 mag star alpha Leonis = Regulus = SAO 98967.
       !!! 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.
       20-degree chart
       3-degree chart
       0.5-degree chart
    
    Data for the target star:
     * name: TYC 0829-00848-1
     * constellation: Leo
     * J2000 position [h,m,s; o,',"]: 09h 57m 44.1220s; +08o 56' 52.971"
     * position source: UCAC2
     * estimated accuracy ["]: 0.03" (0.02", 0.02")
     * V mag [mag]: 9.80
     * B-V [mag]: +0.48
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (554) Peraga
         approx. diameter [km]: 99
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
         number of used observations: 134 USNO, 56 TMO
         number of rejected observations: 0
         time covered by the observations: 1998 05 18 - 2004 02 15
         rms residuals ["] (RA,DE): 0.08", 0.08"
         estimated positional accuracy at epoch of event ["]: 0.05", 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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