Update for (383) Janina - June 18/19, 2002

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
       (383) Janina / TYC 6310-00303-1 = SAO 188273 on June 18/19 2002
          visible from Ukraine, Moldavia, Romania, Serbia and Italy


Summary 

In night of June 18/19, 2002 a 10.4 mag star TYC 6310-00303-1 = SAO 188273 will be occulted by a 50 km asteroid (383) Janina. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC1 star position.

The updated path shows ~2 path width south shift with time ~1.0 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over Ukraine just south of Kiev ~0:54.5 UT, Moldavia ~0:54.7 UT, central Romania around 0:55 UT, Serbia just south of Beograd ~0:55.4 UT and south Italy with Foggia nad Napoli ~0:56.1 UT. Uncertainty is rather large and so also other areas have some possibility - like Hungary and south Spain and Portugal. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: June 19, 2002 @ 00:56 UT
 * magnitude of target star: 10.4
 * magnitude drop [mag]: 4.6
 * estimated maximum duration [s]: 4.4
 * path description: given above
 * Goffin's original chart reference: A02_0627

The occultation path:
 * approximate ground width [km]: 100
 * uncertainty [path widths]: 4.0
 * uncertainty in time [s]: 20
 * map: below
 * remarks: Path uncertainties are given according to nominal star
    position errors and expected asteroid positional accuracy.

Data for the target star:
 * name: SAO 188273 = PPM 269950 = TYC 6310-00303-1
 * constellation: Sagittarius
 * J2000 position [h,m,s; o,',"]: 19h 33m 24.9494s; -22o 26' 11.979"
 * position source: UCAC1
 * estimated accuracy ["]: 0.01" (0.010", 0.008")
 * V mag [mag]: 10.40
 * B-V [mag]: +0.30
 * remarks:
    Target star is in northeast Sagittarius.
    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 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
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (383) Janina
     approx. diameter [km]: 50
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 73 USNO
     number of rejected observations: 4 USNO
     time covered by the observations: 1998 09 28 - 2002 06 12
     rms residuals ["] (RA,DE): 0.12", 0.12"
     estimated positional accuracy at epoch of event ["]: 0.11", 0.11"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 00:58.4 UT
 * approx. V mag of minor planet at event [mag]: 15.0
 * geocentric parallax of minor planet ["]: 3.601
 * magnitude drop [mag]: 4.6
 * estimated maximum duration [s]: 4.4
 * apparent motion of minor planet ["/h]: 22.96
 * angular distance to moon, phase of moon [deg,%]: 100, 62%
 * 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  '  "
     34  0  0    51  7  7    0 54 15    14    -5   51 45 15   50 29 58
     33  0  0    50 31 24    0 54 20    15    -6   51  9  3   49 54 42
     32  0  0    49 56  9    0 54 24    16    -7   50 33 20   49 19 54
     31  0  0    49 21 25    0 54 29    17    -7   49 58  9   48 45 35
     30  0  0    48 47 12    0 54 34    17    -8   49 23 29   48 11 47
     29  0  0    48 13 31    0 54 39    18    -9   48 49 23   47 38 30
     28  0  0    47 40 23    0 54 44    19   -10   48 15 50   47  5 45
     27  0  0    47  7 49    0 54 49    19   -11   47 42 51   46 33 33
     26  0  0    46 35 48    0 54 55    20   -12   47 10 27   46  1 54
     25  0  0    46  4 23    0 55  1    21   -12   46 38 39   45 30 50
     24  0  0    45 33 33    0 55  7    21   -13   46  7 28   45  0 20
     23  0  0    45  3 19    0 55 13    22   -14   45 36 53   44 30 26
     22  0  0    44 33 42    0 55 19    23   -15   45  6 56   44  1  8
     21  0  0    44  4 42    0 55 26    23   -16   44 37 36   43 32 27
     20  0  0    43 36 20    0 55 32    24   -16   44  8 55   43  4 22
     19  0  0    43  8 36    0 55 39    24   -17   43 40 52   42 36 55
     18  0  0    42 41 30    0 55 46    25   -18   43 13 29   42 10  6
     17  0  0    42 15  2    0 55 53    25   -19   42 46 45   41 43 55
     16  0  0    41 49 14    0 55 60    26   -19   42 20 40   41 18 22
     15  0  0    41 24  5    0 56  7    26   -20   41 55 16   40 53 28
     14  0  0    40 59 36    0 56 14    27   -21   41 30 31   40 29 13
     13  0  0    40 35 47    0 56 22    27   -21   41  6 27   40  5 37
     12  0  0    40 12 37    0 56 29    28   -22   40 43  4   39 42 41
     11  0  0    39 50  8    0 56 37    28   -23   40 20 22   39 20 25
     10  0  0    39 28 20    0 56 44    28   -23   39 58 21   38 58 49
      9  0  0    39  7 12    0 56 52    29   -24   39 37  1   38 37 53
      8  0  0    38 46 45    0 56 60    29   -25   39 16 22   38 17 37
      7  0  0    38 26 59    0 57  8    29   -25   38 56 25   37 58  2
      6  0  0    38  7 55    0 57 15    29   -26   38 37  9   37 39  7
      5  0  0    37 49 31    0 57 23    30   -26   38 18 35   37 20 53
      4  0  0    37 31 49    0 57 31    30   -27   38  0 43   37  3 20
      3  0  0    37 14 48    0 57 39    30   -27   37 43 33   36 46 29
      2  0  0    36 58 29    0 57 47    30   -28   37 27  5   36 30 18
      1  0  0    36 42 51    0 57 55    30   -28   37 11 20   36 14 48
      0  0  0    36 27 56    0 58  3    30   -29   36 56 16   36  0  0
   -  1  0  0    36 13 42    0 58 11    30   -29   36 41 54   35 45 53
   -  2  0  0    36  0 10    0 58 19    30   -30   36 28 15   35 32 28
   -  3  0  0    35 47 19    0 58 27    30   -30   36 15 18   35 19 44
   -  4  0  0    35 35 11    0 58 35    30   -30   36  3  4   35  7 42
   -  5  0  0    35 23 45    0 58 43    30   -31   35 51 32   34 56 22
   -  6  0  0    35 13  1    0 58 51    30   -31   35 40 43   34 45 43
   -  7  0  0    35  2 59    0 58 59    30   -31   35 30 36   34 35 46
   -  8  0  0    34 53 40    0 59  7    30   -32   35 21 12   34 26 31
   -  9  0  0    34 45  2    0 59 15    30   -32   35 12 30   34 17 57
   - 10  0  0    34 37  7    0 59 23    30   -32   35  4 31   34 10  6
   - 11  0  0    34 29 55    0 59 30    29   -32   34 57 15   34  2 57
   - 12  0  0    34 23 25    0 59 38    29   -32   34 50 42   33 56 29
   - 13  0  0    34 17 37    0 59 46    29   -32   34 44 51   33 50 44
   - 14  0  0    34 12 32    0 59 53    29   -33   34 39 44   33 45 41
   - 15  0  0    34  8  9    1  0  1    28   -33   34 35 19   33 41 21
   ........................... 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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