Update for (366) Vincentina - April 7/8, 2003

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
             (366) Vincentina / TYC 2423-00187-1 on April 7/8, 2003
        visible from S Norway, S Sweden, NE Poland, SW Belarus, Ukraine,
                    Crimean peninsula, E Turkey and Iran

Summary 

In the evening of April 7/8, 2003 a faint 11.6 mag star TYC 2423-00187-1 will be occulted by a 98 km asteroid (366) Vincentina. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.

The updated path shows ~1 path width SW shift with no time correction compared to Edwin Goffin's nominal prediction.

Updated path runs over S Norway in evening twilight ~18:55.7 UT, S Sweden ~18:56.0 UT, NE Poland ~18:56.4 UT, SW Belarus ~18:56.5 UT, Ukraine from NW to SE ~18:56.8 UT, Crimean peninsula ~18:57.2 UT, E Turkey ~18:57.6 UT and Iran around 18:58 UT. 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 7, 2003 @ 18:57 UT (Europe)
 * magnitude of target star: 11.6
 * magnitude drop [mag]: 3.2
 * estimated maximum duration [s]: 4.0
 * path description: given above
 * Goffin's original chart reference: A03_0434

The occultation path:
 * approximate ground width [km]: 120
 * uncertainty [path widths]: 1.3
 * uncertainty in time [s]: 6
 * map: below
 * remarks: Path uncertainties are given according to nominal star
    position errors and expected asteroid positional accuracy.

Data for the target star:
 * name: TYC 2423-00187-1
 * constellation: Auriga
 * J2000 position [h,m,s; o,',"]: 06h 00m 00.9444s; +32o 12' 00.143"
 * position source: recent UCAC position combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.03" (0.03", 0.02")
 * V mag [mag]: 11.58
 * B-V [mag]: +0.54
 * remarks:
    Target star is in south Auriga, about 5.0 degrees south of 2.6 mag star theta Aurigae = SAO 58636
    or 1.6 degrees east of open cluster M37. Target star is fainter and southern one in a 31" wide N-S pair of stars.
    !!! 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.

Close finding chart (prepared in GUIDE8):
 * 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
 * remarks: Second chart is 30' blowup to show correctly the target star in the field.











Data for the minor planet:
 * general information:
     number, name: (366) Vincentina
     approx. diameter [km]: 98
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 139 USNO, 12 TMO
     number of rejected observations: 29 USNO, 3 TMO
     time covered by the observations: 1998 01 29 - 2003 01 19
     rms residuals ["] (RA,DE): 0.08", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 18:54.8 UT
 * approx. V mag of minor planet at event [mag]: 14.7
 * geocentric parallax of minor planet ["]: 2.536
 * magnitude drop [mag]: 3.2
 * estimated maximum duration [s]: 4.0
 * apparent motion of minor planet ["/h]: 34.86
 * angular distance to moon, phase of moon [deg,%]: 10, 29%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Apr 07
366 Vincentina
18h 54.8m UT
23-00187-1  11.6    6  0  0.944 32 12  0.14TYC 2423-00187-1
14.7     98    4.0   3.468     2.686     -7.28
  -29.344  32.202  -103.17    6.89
 18.9141   .11820   .55473 13.44432 -2.87197  0.00558  0.00027
2000    154.8793832003 4 1.00000320.919243347.05847510.561325 0.057530503.144778452.963857788.505   0.15
RATE 1.7673360 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================

Calculator(s): Jan Manek








Path coordinates:
                  Centre               Altitude       Path Limits
  E. Longitude   Latitude      U.T.   star   sun   Limit 1    Limit 2
                                                   Latitude   Latitude
  ............................. shortened ..................................
      o  '  "     o  '  "    h  m  s     o     o    o  '  "    o  '  "
      8  0  0    59 44 30   18 55 41    53    -5   59  4 46   60 24 38
      9  0  0    59 21 55   18 55 44    53    -5   58 41 57   60  2 16
     10  0  0    58 58 43   18 55 47    52    -6   58 18 31   59 39 18
     11  0  0    58 34 53   18 55 50    52    -6   57 54 28   59 15 42
     12  0  0    58 10 25   18 55 53    52    -7   57 29 46   58 51 28
     13  0  0    57 45 18   18 55 56    51    -8   57  4 26   58 26 35
     14  0  0    57 19 32   18 55 59    51    -8   56 38 28   58  1  3
     15  0  0    56 53  7   18 56  2    51    -9   56 11 50   57 34 51
     16  0  0    56 26  2   18 56  5    50   -10   55 44 32   57  7 59
     17  0  0    55 58 17   18 56  8    50   -11   55 16 34   56 40 27
     18  0  0    55 29 52   18 56 11    50   -11   54 47 57   56 12 15
     19  0  0    55  0 46   18 56 15    49   -12   54 18 38   55 43 21
     20  0  0    54 30 59   18 56 18    49   -13   53 48 40   55 13 46
     21  0  0    54  0 31   18 56 21    48   -14   53 18  1   54 43 30
     22  0  0    53 29 22   18 56 24    48   -14   52 46 41   54 12 32
     23  0  0    52 57 32   18 56 28    47   -15   52 14 41   53 40 53
     24  0  0    52 25  1   18 56 31    47   -16   51 41 60   53  8 33
     25  0  0    51 51 50   18 56 34    46   -17   51  8 39   52 35 31
     26  0  0    51 17 58   18 56 38    45   -18   50 34 38   52  1 48
     27  0  0    50 43 26   18 56 41    45   -19   49 59 57   51 27 25
     28  0  0    50  8 14   18 56 45    44   -19   49 24 38   50 52 21
     29  0  0    49 32 23   18 56 48    44   -20   48 48 39   50 16 38
     30  0  0    48 55 53   18 56 51    43   -21   48 12  3   49 40 15
     31  0  0    48 18 46   18 56 55    42   -22   47 34 50   49  3 14
     32  0  0    47 41  2   18 56 58    41   -23   46 56 60   48 25 35
     33  0  0    47  2 41   18 57  2    41   -24   46 18 35   47 47 19
     34  0  0    46 23 45   18 57  5    40   -25   45 39 35   47  8 28
     35  0  0    45 44 16   18 57  9    39   -26   45  0  2   46 29  1
     36  0  0    45  4 13   18 57 12    38   -27   44 19 57   45 49  1
     37  0  0    44 23 39   18 57 15    37   -28   43 39 22   45  8 29
     38  0  0    43 42 35   18 57 19    37   -29   42 58 17   44 27 26
     39  0  0    43  1  2   18 57 22    36   -30   42 16 44   43 45 53
     40  0  0    42 19  2   18 57 25    35   -31   41 34 44   43  3 53
     41  0  0    41 36 37   18 57 29    34   -32   40 52 21   42 21 26
     42  0  0    40 53 48   18 57 32    33   -33   40  9 34   41 38 35
     43  0  0    40 10 38   18 57 35    32   -34   39 26 26   40 55 22
     44  0  0    39 27  7   18 57 38    31   -35   38 42 59   40 11 48
     45  0  0    38 43 19   18 57 41    30   -36   37 59 15   39 27 55
     46  0  0    37 59 14   18 57 44    29   -37   37 15 15   38 43 45
     47  0  0    37 14 55   18 57 47    28   -38   36 31  2   37 59 20
     48  0  0    36 30 25   18 57 50    27   -39   35 46 38   37 14 43
     49  0  0    35 45 44   18 57 53    26   -40   35  2  4   36 29 56
     50  0  0    35  0 56   18 57 55    25   -42   34 17 24   35 44 60
     51  0  0    34 16  2   18 57 58    24   -43   33 32 38   34 59 58
     52  0  0    33 31  5   18 58  0    23   -44   32 47 50   34 14 51
     53  0  0    32 46  7   18 58  3    22   -45   32  3  0   33 29 43
     54  0  0    32  1  9   18 58  5    21   -46   31 18 12   32 44 36
     55  0  0    31 16 14   18 58  7    20   -47   30 33 28   31 59 30
     56  0  0    30 31 25   18 58  9    19   -48   29 48 49   31 14 30
     57  0  0    29 46 42   18 58 11    17   -49   29  4 17   30 29 36
     58  0  0    29  2  9   18 58 13    16   -50   28 19 55   29 44 51
     59  0  0    28 17 46   18 58 15    15   -51   27 35 45   29  0 16
     60  0  0    27 33 37   18 58 17    14   -52   26 51 48   28 15 54
     61  0  0    26 49 43   18 58 18    13   -53   26  8  5   27 31 47
     62  0  0    26  6  5   18 58 20    12   -54   25 24 40   26 47 57
     63  0  0    25 22 46   18 58 21    11   -55   24 41 34   26  4 25
     64  0  0    24 39 47   18 58 22     9   -56   23 58 48   25 21 13
     65  0  0    23 57 11   18 58 23     8   -57   23 16 25   24 38 22
     66  0  0    23 14 57   18 58 24     7   -58   22 34 25   23 55 55
  ............................. 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-|
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