Update for (409) Aspasia - October 18, 2001

  • Update computed by Jan Manek;   issued 11 Oct 2000 23:59:00 +0200 (CEST)

  • Jan Manek's update

                          IOTA/IOTA-ES occultation update for
                (409) Aspasia / TYC 05688-00868-1 on October 18, 2001
                 visible from England and S Scotland, N Netherlands,
                            Denmark, N Germany and S Sweden
    
    Summary 

    In the evening of October 18, 2001 a 10.9 mag star TYC 05688-00868-1 will be occulted by a 168 km asteroid (409) Aspasia. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Tycho-2 star position.

    The updated path shows no path shift or time correction compared to Edwin Goffin's nominal prediction.

    The path of this occultation runs over Ireland in strong evening twilight ~18:01 UT, S Scotland and England around 18:01.3 UT. Thenafter north Netherlands, Denmark and baltic coast of Germany ~18:01.5 UT and S Sweden are in path. More to east the star is too low. Please check the path chart for details.

    Faint star at low altitudes, but rather wide path, so there is a high chance for observers with larger telescopes.

    
    The event at one glimpse:
     * date and approx. UT time of event: October 18, 2001 @ 18:01 UT (Euro)
     * magnitude of target star: 10.9
     * magnitude drop [mag]: 1.9
     * estimated maximum duration [s]: 5.7
     * path description: given above
     * Goffin's original chart reference: A01_1033
    
    The occultation path:
     * approximate ground width [km]: 400
     * uncertainty [path widths]: 1.4
     * uncertainty in time [s]: 10
     * map: below
     * remarks: Path uncertainities are given according to nominal star
        position errors and expected asteroid positional accuracy.
    
    Data for the target star:
     * name: TYC 05688-00868-1
     * constellation: Serpens
     * J2000 position [h,m,s; o,',"]: 18h 14m 49.704s; -14o 58' 03.34"
     * position source: Tycho-2
     * estimated accuracy ["]: 0.07" (0.04", 0.05")
     * V mag [mag]: 10.89
     * B-V [mag]: +0.27
     * remarks:
         Target star is in SE Serpens, close to border with Scutum and Sagittarius,
         about 3.5 degrees west of 4.7 mag star gamma Serpentis = SAO 161520.
         Target star is NW in a pair of almost equal magnotude star with only 1'
         separation.
    
    Close finding chart (prepared in GUIDE7):
     * occulted star is in center - labeled with cross
     * field is 2.0x2.0 degrees
     * limiting magnitude is 12.5
     * labeled stars have indicated SAO numbers
    
    

    Close finding chart Data for the minor planet: * general information: number, name: (409) Aspasia approx. diameter [km]: 168 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen) number of used observations: 79 USNO, 12 TMO number of rejected observations: 6 USNO, 1 TMO time covered by the observations: 1998 07 02 - 2001 08 07 rms residuals ["] (RA,DE): 0.07", 0.07" estimated positional accuracy at epoch of event ["]: 0.08" remarks: Data for the event: * UT date and time of least geocentric approach: 18:00.5 UT * approx. V mag of minor planet at event [mag]: 12.6 * geocentric parallax of minor planet ["]: 3.304 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 5.7 * apparent motion of minor planet ["/h]: 55.11 * angular distance to moon, phase of moon [deg,%]: 42, 5% * remarks: Calculator(s): Jan Manek

    Updated path location for (409) Aspasia on October 18, 2001 Path coordinates: Latitude Latitude Centre Altitude Path Limits E. Longitude Latitude U.T. star sun Limit 1 Limit 2 ........................... shortened ............................. o ' " o ' " h m s o o o ' " o ' " - 9 0 0 52 13 49 18 1 2 22 -5 50 23 11 54 13 23 - 8 0 0 52 20 23 18 1 4 21 -5 50 29 33 54 20 12 - 7 0 0 52 27 21 18 1 6 21 -6 50 36 19 54 27 26 - 6 0 0 52 34 44 18 1 8 21 -7 50 43 28 54 35 5 - 5 0 0 52 42 30 18 1 10 21 -7 50 51 0 54 43 9 - 4 0 0 52 50 40 18 1 12 20 -8 50 58 56 54 51 39 - 3 0 0 52 59 14 18 1 14 20 -8 51 7 14 55 0 32 - 2 0 0 53 8 12 18 1 16 19 -9 51 15 55 55 9 50 - 1 0 0 53 17 32 18 1 18 19 -10 51 24 59 55 19 32 0 0 0 53 27 15 18 1 20 19 -10 51 34 24 55 29 38 1 0 0 53 37 21 18 1 22 18 -11 51 44 12 55 40 7 2 0 0 53 47 49 18 1 24 18 -11 51 54 21 55 50 60 3 0 0 53 58 39 18 1 26 17 -12 52 4 51 56 2 15 4 0 0 54 9 51 18 1 27 17 -13 52 15 43 56 13 53 5 0 0 54 21 24 18 1 29 17 -13 52 26 55 56 25 53 6 0 0 54 33 18 18 1 31 16 -14 52 38 27 56 38 16 7 0 0 54 45 33 18 1 32 16 -14 52 50 19 56 50 59 8 0 0 54 58 8 18 1 34 15 -15 53 2 31 57 4 4 9 0 0 55 11 3 18 1 35 15 -16 53 15 3 57 17 30 10 0 0 55 24 17 18 1 37 14 -16 53 27 53 57 31 16 11 0 0 55 37 51 18 1 38 14 -17 53 41 2 57 45 23 12 0 0 55 51 43 18 1 39 13 -17 53 54 28 57 59 48 13 0 0 56 5 54 18 1 41 13 -18 54 8 13 58 14 33 14 0 0 56 20 23 18 1 42 12 -18 54 22 15 58 29 36 15 0 0 56 35 8 18 1 43 12 -19 54 36 34 58 44 58 16 0 0 56 50 11 18 1 44 11 -19 54 51 9 59 0 37 17 0 0 57 5 30 18 1 45 10 -20 55 5 60 59 16 34 18 0 0 57 21 5 18 1 46 10 -20 55 21 6 59 32 47 19 0 0 57 36 56 18 1 47 9 -21 55 36 27 59 49 16 20 0 0 57 53 1 18 1 48 9 -21 55 52 3 60 6 1 ........................... shortened ............................. ---------------------------------------------------------------------------- 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@worldonline.cz |-O-O-| --------------------------------------------------------------------U---U---

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