Update for (96) Aegle - October 3/4, 2005

  • Update computed by Jan Manek;   issued 28 Sep 2005 22:54 +0200 (CEST)

  • Jan Manek's update

                      IOTA/IOTA-ES occultation update for
       (96) Aegle / UCAC2 46117426 = GSC 2918-01572 on October 3/4, 2005
                    visible from Africa, Turkey and Russia
    
    Summary 

    In the morning of night of October 3/4, 2005 a faint 12.1 mag star UCAC2 46117426 = GSC 2918-01572 will be occulted by a 174 km asteroid (96) Aegle. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~0.5 path width north shift with time ~0.1 minutes earlier compared to Edwin Goffin's nominal prediction.

    Updated path runs over Africa, Turkey ~0:54 UT and Russa from SW to NE ~0:55 -> ~1:01 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 04, 2005 @ 00:56 UT (Europe)
     * magnitude of target star: 12.1
     * magnitude drop [mag]: 1.5
     * estimated maximum duration [s]: 18.1
     * approx. V mag of minor planet at event [mag]: 13.3
     * geocentric parallax of minor planet ["]: 3.284
     * apparent motion of minor planet ["/h]: 17.75
     * angular distance to moon, phase of moon [deg,%]: 112, 0%
     * Goffin's original chart reference: A05_1017
    
    The occultation path with path maps:
     * approximate ground width [km]: 180
     * uncertainty [path widths]: 1.7
     * uncertainty in time [s]: 22
     * 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 Auriga, about 5.4 degrees SSE of 0.2 mag star alpha Aurigae = SAO 40186.
       !!! 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: UCAC2 46117426 = GSC 2918-01572
     * constellation: Auriga
     * J2000 position [h,m,s; o,',"]: 05h 31m 14.8621s; +41d 19' 32.217"
     * position source: UCAC2
     * estimated 1-sigma accuracy ["]: 0.016", 0.016"
     * V mag [mag]: 12.11 (averaged NSVS V-mag)
     * B-V [mag]: +?.?
     * remarks:
    
    Data for the minor planet:
     * general information:
         number, name: (96) Aegle
         approx. diameter [km]: 174
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
         number of used observations: 149 USNO, 32 TMO
         number of rejected observations: 0
         time covered by the observations: 1998 06 28 - 2004 12 20
         estimated positional 2-sigma accuracy at epoch of event ["]: 0.150", 0.038", 95 deg
         remarks:
     * orbital elements
    	Semimajor axis     =   3.05855355174130
    	Eccentricity       =   0.131925960644771
    	Inclination        =  15.9353228785628 deg
    	Long. of node      = 321.8163267663738 deg
    	Arg. of pericenter = 206.8382465121355 deg
    	Mean anomaly       = 271.4488480842753 deg
    	Epoch of elements  : MJD   53647.04000000 TDT (Oct  4, 2005,  0.960000 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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