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

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





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





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-|
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