Update for (201) Penelope - May 9/10, 2004

  • Update computed by Jan Manek;   issued 25 Apr 2004 13:59 +0200 (CEST)

  • Jan Manek's update

                         IOTA/IOTA-ES occultation update for
                 (201) Penelope / TYC 1382-01324-1 on May 9/10, 2004
             visible from N Ireland, N England, Belgium, Germany, Austria,
                SW Hungary, NE Serbia, SW Romania, Bulgaria and Turkey

    In the night of May 9/10, 2004 a faint 11.8 mag star TYC 1382-01324-1 will be occulted by a 71 km asteroid (201) Penelope. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.

    The updated path shows ~7 path width north shift with time ~1.1 minutes earlier compared to Edwin Goffin's nominal prediction. The difference is cause mainly by using UCAC2 star position.

    Updated path runs over N Ireland ~20:51.0 UT, N England ~20:51.3 UT, Belgium ~20:51.5 UT, Germany ~20:51.7 UT, Austria ~20:51.9 UT, SW Hungary ~20:52.0 UT, NE Serbia ~20:52.1 UT, SW Romania ~20:52.3 UT, Bulgaria ~20:52.4 UT and Turkey ~20:52.5 UT at low altitudes. Please check the path chart for details.

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    The event at one glimpse:
     * date and approx. UT time of event: May 9, 2004 @ 20:52 UT (Europe)
     * magnitude of target star: 11.8
     * magnitude drop [mag]: 2.6
     * estimated maximum duration [s]: 3.1
     * approx. V mag of minor planet at event [mag]: 14.3
     * geocentric parallax of minor planet ["]: 2.688
     * apparent motion of minor planet ["/h]: 34.94
     * angular distance to moon, phase of moon [deg,%]: 172, 68%
     * Goffin's original chart reference: A04_0521
    The occultation path with path maps:
     * approximate ground width [km]: 100
     * uncertainty [path widths]: 1.1
     * uncertainty in time [s]: 5
     * 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 west Cancer, about 6.2 degrees west of 3.9 mag star delta Cancri = SAO 98087.
       The double star COU 952 (=SAO 97724) only 12' NE of target is not resolvable by normal amateur telescope as component separation is only 0.2".
       !!! 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 1382-01324-1
     * constellation: Cancer
     * J2000 position [h,m,s; o,',"]: 08h 18m 26.5081s; +18o 01' 27.262"
     * position source: UCAC2
     * estimated accuracy ["]: 0.03" (0.02", 0.02")
     * V mag [mag]: 12.80
     * B-V [mag]: +0.04
     * remarks: For prediction I have used V mag 11.80 as it was more consistent with data from UCAC2 and GSC.
    Data for the minor planet:
     * general information:
         number, name: (201) Penelope
         approx. diameter [km]: 71
     * orbital information
         orbit source: calculation Manek
         source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
         number of used observations: 134 USNO, 59 TMO
         number of rejected observations: 0
         time covered by the observations: 1997 05 09 - 2004 03 29
         rms residuals ["] (RA,DE): 0.10", 0.10"
         estimated positional accuracy at epoch of event ["]: 0.04", 0.03"
    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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