Update for (636) Erika - October 14/15, 2004

  • Update computed by Jan Manek;   issued 09 Oct 2004 10:18 +0200 (CEST)

  • Jan Manek's update

                         IOTA/IOTA-ES occultation update for
             (636) Erika / TYC 1224-00281-1 on October 14/15, 2004
          visible from Russia, S Estonia, N Latvia, S Sweden, N Denmark,
                            Scotland and N Ireland
    
    Summary 

    In the night of October 14/15, 2004 a faint 10.8 mag star TYC 1224-00281-1 will be occulted by a 78 km asteroid (636) Erika. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~1 path width N shift with time ~0.3 minute earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over Russia from Siberia to Europe at 23:02-23:08 UT, S Estonia ~23:08.7 UT, N Latvia ~23:08.8 UT, S Sweden ~23:09.8 UT, N Denmark ~23:10.3 UT, Scotland ~23:11.6 UT and N Ireland ~23:12.0 UT. 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: October 14, 2004 @ 23:10 UT (Europe)
     * magnitude of target star: 10.8
     * magnitude drop [mag]: 2.7
     * estimated maximum duration [s]: 8.0
     * approx. V mag of minor planet at event [mag]: 13.4
     * geocentric parallax of minor planet ["]: 5.260
     * apparent motion of minor planet ["/h]: 28.79
     * angular distance to moon, phase of moon [deg,%]: 167, 1%
     * Goffin's original chart reference: A04_1033
    
    The occultation path with path maps:
     * approximate ground width [km]: 105
     * uncertainty [path widths]: 1.25
     * uncertainty in time [s]: 10
     * 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 SE Aries, about 12 degrees ESE of 2.0 mag star alpha Arietis = SAO 75151 = Hamal
       or 47' SSE od 5.3 mag star pi Arietis = SAO 93127.
       !!! 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 1224-00281-1
     * constellation: Aries
     * J2000 position [h,m,s; o,',"]: 02h 51m 00.8178s; +16o 48' 45.298"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.026" (0.017", 0.020")
     * V mag [mag]: 10.83
     * B-V [mag]: +1.22
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (636) Erika
         approx. diameter [km]: 78
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone)
         number of used observations: 156 USNO
         number of rejected observations: 0
         time covered by the observations: 1998 04 09 - 2004 10 03
         rms residuals ["] (RA,DE): 0.15", 0.15"
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.14", 0.05"
         remarks:
     * orbital elements
    	Semimajor axis     =   2.90851834244459 AU
    	Eccentricity       =   0.175013356926157
    	Inclination        =   7.9331404706977 deg
    	Long. of node      =  34.8001458617685 deg
    	Arg. of pericenter = 298.1501082321064 deg
    	Mean anomaly       =  46.7708952853638 deg
    	Epoch of elements  : MJD   53292.97000000 TDT (Oct 14, 2004, 23.280000 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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