Update for (190) Ismene - November 19, 2002 - South Africa

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
             (190) Ismene / TYC 6113-01415-1 on November 19, 2002
                         visible from South Africa

Summary 

In the evening of November 19, 2002 a 10.6 mag star TYC 6313-01415-1 = PPM 721288 will be occulted by a 100 km asteroid (190) Ismene. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC1 star position.

The updated path shows no path shift with time ~0.7 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs over S of South Africa, just south of Cape Town ~18:29.4 UT on west coast and between East London and Durban ~18:29.8 UT on east coast. Path just miss the south coast of Madagascar. True uncertainty will be probably about half of the one in the path chart. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: November 19, 2002 @ 18:29.5 UT
 * magnitude of target star: 10.6
 * magnitude drop [mag]: 4.4
 * estimated maximum duration [s]: 3.6
 * path description: given above
 * Goffin's original chart reference: A02_1110

The occultation path:
 * approximate ground width [km]: 120
 * uncertainty [path widths]: 4.6
 * uncertainty in time [s]: 13
 * 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 6313-01415-1 = PPM 721288
 * constellation: Sagittarius
 * J2000 position [h,m,s; o,',"]: 19h 57m 32.5049s; -16o 29' 21.106"
 * position source: UCAC1
 * estimated accuracy ["]: 0.06" (0.02", 0.05")
 * V mag [mag]: 10.55
 * B-V [mag]: +0.39
 * remarks:
    Target star is in northeast Sagittarius, 1.0 degree south of 5.0 mag star 61 Sagittarii = SAO 163141.
    !!! 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 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: (190) Ismene
     approx. diameter [km]: 100
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 91 USNO
     number of rejected observations: 6 USNO
     time covered by the observations: 1998 01 29 - 2002 10 11
     rms residuals ["] (RA,DE): 0.13", 0.13"
     estimated positional accuracy at epoch of event ["]: 0.08", 0.08"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 18:26.9 UT
 * approx. V mag of minor planet at event [mag]: 15.0
 * geocentric parallax of minor planet ["]: 1.813
 * magnitude drop [mag]: 4.4
 * estimated maximum duration [s]: 3.6
 * apparent motion of minor planet ["/h]: 28.30
 * angular distance to moon, phase of moon [deg,%]: 116, 100%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2002 Nov 19
190 Ismene
18h 26.9m UT
13-01415-1  10.6   19 57 32.505-16 29 21.11TYC 6313-01415-1
15.0    100    3.6   4.851     1.958      2.83
  -35.962 -16.490  -100.37  -19.55
 18.4490   .04613  -.47319 15.53176  1.55783  0.00516  0.00125
2000    230.76073520021112.00000274.656841176.0045366.163702  0.167165193.985442063.319214877.595   0.15
RATE 1.2387660 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================


Calculator(s): Jan Manek





Path coordinates:
                  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  '  "
                                                   Latitude   Latitude
     15  0  0   -35 46 46   18 29 13    41    -8  -36 19 28  -35 14 14
     16  0  0   -35 29 51   18 29 16    40    -9  -36  2 34  -34 57 17
     17  0  0   -35 12 46   18 29 18    39   -10  -35 45 31  -34 40 11
     18  0  0   -34 55 31   18 29 21    38   -11  -35 28 17  -34 22 55
     19  0  0   -34 38  7   18 29 23    37   -11  -35 10 54  -34  5 29
     20  0  0   -34 20 33   18 29 26    37   -12  -34 53 22  -33 47 55
     21  0  0   -34  2 51   18 29 28    36   -13  -34 35 41  -33 30 12
     22  0  0   -33 45  1   18 29 30    35   -14  -34 17 52  -33 12 20
     23  0  0   -33 27  2   18 29 33    34   -15  -33 59 54  -32 54 20
     24  0  0   -33  8 56   18 29 35    33   -16  -33 41 49  -32 36 13
     25  0  0   -32 50 42   18 29 37    32   -17  -33 23 36  -32 17 58
     26  0  0   -32 32 21   18 29 39    32   -17  -33  5 16  -31 59 37
     27  0  0   -32 13 54   18 29 42    31   -18  -32 46 49  -31 41  9
     28  0  0   -31 55 20   18 29 44    30   -19  -32 28 16  -31 22 35
     29  0  0   -31 36 41   18 29 46    29   -20  -32  9 37  -31  3 55
     30  0  0   -31 17 56   18 29 48    28   -21  -31 50 53  -30 45  9
     31  0  0   -30 59  6   18 29 50    27   -22  -31 32  3  -30 26 19
     32  0  0   -30 40 11   18 29 52    26   -23  -31 13  9  -30  7 24
     33  0  0   -30 21 12   18 29 53    25   -23  -30 54 10  -29 48 25
     34  0  0   -30  2  9   18 29 55    25   -24  -30 35  7  -29 29 22
     35  0  0   -29 43  3   18 29 57    24   -25  -30 16  1  -29 10 16
     36  0  0   -29 23 54   18 29 59    23   -26  -29 56 52  -28 51  7
     37  0  0   -29  4 43   18 30  0    22   -27  -29 37 41  -28 31 56
     38  0  0   -28 45 29   18 30  2    21   -28  -29 18 27  -28 12 42
     39  0  0   -28 26 14   18 30  3    20   -29  -28 59 11  -27 53 27
     40  0  0   -28  6 58   18 30  5    19   -29  -28 39 54  -27 34 12
     41  0  0   -27 47 41   18 30  6    18   -30  -28 20 37  -27 14 55
     42  0  0   -27 28 23   18 30  8    17   -31  -28  1 19  -26 55 38
     43  0  0   -27  9  6   18 30  9    16   -32  -27 42  1  -26 36 22
     44  0  0   -26 49 50   18 30 10    15   -33  -27 22 44  -26 17  6
     45  0  0   -26 30 35   18 30 11    14   -34  -27  3 28  -25 57 52
     46  0  0   -26 11 21   18 30 12    13   -34  -26 44 14  -25 38 39
     47  0  0   -25 52 10   18 30 13    13   -35  -26 25  1  -25 19 29
     48  0  0   -25 33  1   18 30 14    12   -36  -26  5 51  -25  0 21
     49  0  0   -25 13 55   18 30 15    11   -37  -25 46 44  -24 41 16
     50  0  0   -24 54 52   18 30 16    10   -38  -25 27 40  -24 22 14
     51  0  0   -24 35 53   18 30 16     9   -38  -25  8 41  -24  3 17
     52  0  0   -24 16 59   18 30 17     8   -39  -24 49 45  -23 44 24
     53  0  0   -23 58 10   18 30 18     7   -40  -24 30 54  -23 25 36
   ........................... 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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