Update for (1470) Carla - October 21/22, 2000

  • Update computed by Jan Manek;   issued 20 Oct 2000 16:42:20 +0200 (CEST)

  • Jan Manek's update

                      IOTA/IOTA-ES occultation update for
                (1470) Carla / HIP 4778 on October 21/22, 2000
                             visible from Iceland
    
    
    Summary 

    In the night of October 21/22, 2000 a bright 7.5 mag star HIP 4778 = SAO 109605 will be occulted by a small 41 km asteroid (1470) Carla. This update is based on USNO/Flagstaff astrometry for the asteroid and Hipparcos star position.

    The updated path shows ~1 path width NW shift and time ~1.3 minutes earlier compared to Edwin Goffin's nominal prediction.

    The path of this occultation runs over Iceland only at ~20:10 UT.

    
    The event at one glimpse:
     * date and approx. UT time of event: October 21, 2000 @ 20:10 UT (Euro)
     * magnitude of target star: 7.5
     * magnitude drop [mag]: 7.8
     * estimated maximum duration [s]: 3.4
     * path description: given above
     * Goffin's original chart reference: A00_1031
    
    The occultation path:
     * approximate ground width [km]: 115
     * uncertainty [path widths]: 5.0
     * uncertainty in time [s]: 20
     * map: below
     * remarks: Path uncertainities are given according to nominal star
        position errors and expected asteroid positional accuracy.
        !!!!!!!
        Circles along path indicates the centerline for this event.
        They are more accurate than the path limit lines.
        !!!!!!!
    
    Data for the target star:
     * name: HIP 4778 = SAO 109605 = PPM 144170 = TYC 0612-00926-1
     * constellation: Pisces
     * J2000 position [h,m,s; o,',"]: 01h 01m 23.100s; +08o 27' 02.40"
     * position source: Hipparcos
     * estimated accuracy ["]: 0.01" (0.01", 0.01")
     * V mag [mag]: 7.53
     * B-V [mag]: +1.60
     * remarks:
    
    Close finding chart (prepared in GUIDE7):
     * occulted star is in center - labeled with cross
     * field is 3.0x3.0 degrees
     * limiting magnitude is 12.5
     * labeled stars have indicated SAO numbers
    
    

    Close finding chart Data for the minor planet: * general information: number, name: (1470) Carla approx. diameter [km]: 41 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone) number of used observations: 30 USNO number of rejected observations: 5 USNO time covered by the observations: 1998 03 04 - 2000 10 01 rms residuals ["] (RA,DE): 0.13", 0.20" estimated positional accuracy at epoch of event ["]: 0.14" remarks: Data for the event: * UT date and time of least geocentric approach: 20:09.7 UT * approx. V mag of minor planet at event [mag]: 15.3 * geocentric parallax of minor planet ["]: 4.296 * magnitude drop [mag]: 7.8 * estimated maximum duration [s]: 3.4 * apparent motion of minor planet ["/h]: 28.70 * angular distance to moon, phase of moon [deg,%]: 120, 34% * remarks: Calculator(s): Jan Manek

    Updated path location for (1470) Carla on October 21/22, 2000 Path coordinates: Altitude E. Longitude Latitude U.T. star sun ........ shortened .......................... - 7 0 0 71 19 5 20 9 4 20 -20 - 8 0 0 70 40 8 20 9 10 20 -19 - 9 0 0 70 1 38 20 9 17 20 -19 - 10 0 0 69 23 36 20 9 24 20 -19 - 11 0 0 68 46 2 20 9 31 21 -19 - 12 0 0 68 8 57 20 9 37 21 -19 - 13 0 0 67 32 20 20 9 44 21 -19 - 14 0 0 66 56 13 20 9 51 21 -19 - 15 0 0 66 20 35 20 9 57 20 -19 - 16 0 0 65 45 28 20 10 4 20 -18 - 17 0 0 65 10 50 20 10 11 20 -18 - 18 0 0 64 36 43 20 10 17 20 -18 - 19 0 0 64 3 6 20 10 24 20 -17 - 20 0 0 63 30 1 20 10 30 20 -17 - 21 0 0 62 57 28 20 10 36 20 -17 - 22 0 0 62 25 26 20 10 42 19 -16 - 23 0 0 61 53 57 20 10 49 19 -16 - 24 0 0 61 22 60 20 10 55 19 -16 - 25 0 0 60 52 36 20 11 1 18 -15 ........ shortened .......................... ---------------------------------------------------------------------------- Jan Manek Stefanik Observatory Private : Petrin 205 Werichova 950 118 46 Praha 1 152 00 Praha 5 - Barrandov |_|_| Czech Republic Czech Republic / \ Internet : jmanek@mbox.vol.cz |-O-O-| --------------------------------------------------------------------U---U---

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