Update for (12) Victoria - April 27, 2002 - South Africa

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
       (12) Victoria / HIP 42084 = SAO 116904 on April 27, 2002
      visible from N South Africa, S Mozambique and S Madagascar


Summary 

In the evening of April 27, 2002 a 8.9 mag star HIP 42084 = SAO 116904 will be occulted by a 117 km asteroid (12) Victoria. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Hipparcos star position.

The updated path shows no path shift with time 0.1 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over north of South Africa ~16:17.0 UT, south Mozambique ~16:17.5 UT and south Madagascar around 16:19 UT. Reunion is ~1 path width north of path ~16:20.3 UT. Within uncertainties is somewhat larger area. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: April 27, 2002 @ 16:17 UT
 * magnitude of target star: 8.9
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 8.6
 * path description: given above
 * Goffin's original chart reference: A02_0403

The occultation path:
 * approximate ground width [km]: 140
 * uncertainty [path widths]: 1.0
 * uncertainty in time [s]: 10
 * map: below
 * remarks: Path uncertainties are given according to nominal star
    position errors and expected asteroid positional accuracy.

Data for the target star:
 * name: HIP 42084 = SAO 116904 = PPM 154679 = TYC 0797-00412-1
 * constellation: Cancer
 * J2000 position [h,m,s; o,',"]: 08h 34m 39.9669s; +09o 22' 16.706"
 * position source: Hipparcos
 * estimated accuracy ["]: 0.02" (0.015", 0.011")
 * V mag [mag]: 8.93
 * B-V [mag]: +0.80
 * remarks:
    Target star is in south Cancer, about 4.5 degrees east of 3.5 mag star beta Cancri = SAO 116569.
    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.

Close finding chart (prepared in GUIDE7):
 * occulted star is in center - labeled with cross
 * field is 3.0x3.0 degrees
 * limiting magnitude is 13.0
 * labeled stars have indicated SAO numbers
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (12) Victoria
     approx. diameter [km]: 117
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 120 USNO, 28 TMO
     number of rejected observations: 2 USNO
     time covered by the observations: 1997 11 29 - 2002 04 09
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.04", 0.05"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 16:17.2 UT
 * approx. V mag of minor planet at event [mag]: 12.5
 * geocentric parallax of minor planet ["]: 3.431
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 8.6
 * apparent motion of minor planet ["/h]: 26.34
 * angular distance to moon, phase of moon [deg,%]: 97, 99%
 * remarks:

Calculator(s): Jan Manek





Path coordinates:
                                                   Latitude   Latitude
                  Center               Altitude       Path Limits
  E. Longitude   Latitude      U.T.   star   sun   Limit 1    Limit 2
   ........................... shortened .............................
      o  '  "     o  '  "    h  m  s     o     o    o  '  "    o  '  "
     23  0  0   -23 12  9   16 16 15    57    -3  -23 49 49  -22 34 44
     24  0  0   -23  8 36   16 16 23    57    -4  -23 46 16  -22 31 11
     25  0  0   -23  5 14   16 16 31    57    -5  -23 42 54  -22 27 50
     26  0  0   -23  2  4   16 16 38    58    -6  -23 39 44  -22 24 40
     27  0  0   -22 59  6   16 16 46    58    -7  -23 36 45  -22 21 43
     28  0  0   -22 56 20   16 16 54    58    -8  -23 33 59  -22 18 57
     29  0  0   -22 53 45   16 17  2    58    -9  -23 31 24  -22 16 23
     30  0  0   -22 51 23   16 17 10    58   -10  -23 29  1  -22 14  0
     31  0  0   -22 49 12   16 17 17    58   -11  -23 26 50  -22 11 50
     32  0  0   -22 47 14   16 17 25    58   -12  -23 24 51  -22  9 52
     33  0  0   -22 45 27   16 17 33    58   -13  -23 23  5  -22  8  6
     34  0  0   -22 43 53   16 17 41    58   -13  -23 21 30  -22  6 31
     35  0  0   -22 42 31   16 17 48    57   -14  -23 20  8  -22  5  9
     36  0  0   -22 41 21   16 17 56    57   -15  -23 18 57  -22  3 60
     37  0  0   -22 40 23   16 18  4    57   -16  -23 17 59  -22  3  2
     38  0  0   -22 39 37   16 18 12    57   -17  -23 17 14  -22  2 16
     39  0  0   -22 39  4   16 18 19    56   -18  -23 16 40  -22  1 43
     40  0  0   -22 38 43   16 18 27    56   -19  -23 16 19  -22  1 22
     41  0  0   -22 38 34   16 18 35    56   -20  -23 16 10  -22  1 13
     42  0  0   -22 38 37   16 18 42    55   -21  -23 16 13  -22  1 16
     43  0  0   -22 38 53   16 18 50    55   -22  -23 16 29  -22  1 32
     44  0  0   -22 39 21   16 18 57    55   -23  -23 16 57  -22  1 60
     45  0  0   -22 40  0   16 19  5    54   -24  -23 17 37  -22  2 40
     46  0  0   -22 40 53   16 19 12    54   -25  -23 18 29  -22  3 32
     47  0  0   -22 41 57   16 19 20    53   -26  -23 19 33  -22  4 36
     48  0  0   -22 43 13   16 19 27    53   -27  -23 20 50  -22  5 52
     49  0  0   -22 44 42   16 19 34    52   -28  -23 22 18  -22  7 21
     50  0  0   -22 46 22   16 19 42    52   -29  -23 23 59  -22  9  1
     51  0  0   -22 48 15   16 19 49    51   -30  -23 25 52  -22 10 53
     52  0  0   -22 50 19   16 19 56    50   -30  -23 27 57  -22 12 58
     53  0  0   -22 52 36   16 20  3    50   -31  -23 30 13  -22 15 14
     54  0  0   -22 55  4   16 20 10    49   -32  -23 32 42  -22 17 42
     55  0  0   -22 57 44   16 20 17    48   -33  -23 35 22  -22 20 21
     56  0  0   -23  0 36   16 20 24    48   -34  -23 38 14  -22 23 13
     57  0  0   -23  3 39   16 20 30    47   -35  -23 41 18  -22 26 16
     58  0  0   -23  6 54   16 20 37    46   -36  -23 44 33  -22 29 30
     59  0  0   -23 10 20   16 20 44    46   -37  -23 47 60  -22 32 56
     60  0  0   -23 13 58   16 20 50    45   -38  -23 51 38  -22 36 34
     61  0  0   -23 17 47   16 20 56    44   -39  -23 55 27  -22 40 22
     62  0  0   -23 21 47   16 21  3    43   -40  -23 59 28  -22 44 22
   ........................... shortened .............................

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Jan Manek
Stefanik Observatory                Private :
Petrin 205                          Werichova 950
118 46  Praha 1                     152 00  Praha 5 - Barrandov     |_|_|
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Internet : jan.manek@worldonline.cz                                |-O-O-|
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