Update for (346) Hermentaria - July 2/3, 2003

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
             (346) Hermentaria / TYC 6842-01052-1 on July 2/3, 2003
              visible from Iran, Saudi Arabia and mid-north Africa

Summary 

In the night of July 2/3, 2003 a faint 11.3 mag star TYC 6842-01052-1 will be occulted by a 110 km asteroid (346) Hermentaria. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2-beta star position.

The updated path shows ~2 path width south shift with no time correction compared to Edwin Goffin's nominal prediction.

Updated path runs over Iran ~21:10.5 UT, Saudi Arabia ~21:12.0 UT and mid-north Africa 21:13 UT to 21:20 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: July 2, 2003 @ 21:15 UT
 * magnitude of target star: 11.3
 * magnitude drop [mag]: 0.7
 * estimated maximum duration [s]: 9.0
 * path description: given above
 * Goffin's original chart reference: A03_0727

The occultation path:
 * approximate ground width [km]: 155
 * uncertainty [path widths]: 0.8
 * 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 6842-01052-1
 * constellation: Sagittarius
 * J2000 position [h,m,s; o,',"]: 18h 06m 31.7788s; -24o 01' 55.076"
 * position source: recent UCAC2 beta
 * estimated accuracy ["]: 0.02" (0.02", 0.02")
 * V mag [mag]: 11.25
 * B-V [mag]: +1.44
 * remarks:
    Target star is in northwest Sagittarius, about 0.6 degrees NE of M8 nebula/open cluster complex.
    !!! 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 2.5x2.5 degrees
 * limiting magnitude is 12.5
 * labeled stars have indicated SAO numbers
 * remarks: Second chart shows 30' blowup to show correctly the star in field.











Data for the minor planet:
 * general information:
     number, name: (346) Hermentaria
     approx. diameter [km]: 110
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 133 USNO, 10 TMO
     number of rejected observations: 24 USNO, 1 TMO
     time covered by the observations: 1998 03 22 - 2003 06 24
     rms residuals ["] (RA,DE): 0.06", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.05", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 22:15.0 UT
 * approx. V mag of minor planet at event [mag]: 11.1
 * geocentric parallax of minor planet ["]: 4.761
 * magnitude drop [mag]: 0.7
 * estimated maximum duration [s]: 9.0
 * apparent motion of minor planet ["/h]: 32.79
 * angular distance to moon, phase of moon [deg,%]: 134, 10%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Jul 02
346 Hermentaria
21h 15.0m UT
42-01052-1  11.3   18  6 31.779-24  1 55.08TYC 6842-01052-1
11.1    110    9.0   1.847    -2.332     -7.37
   32.396 -24.029  -137.72   23.02
 21.2492  -.15623   .67633 -6.71005 -1.54815  0.00090  0.00007
2000    263.1910512003 630.00000290.24197892.181119 8.760692  0.102955142.795549212.507733067.135   0.15
RATE 2.1086440 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================

Calculator(s): Jan Manek









Path coordinates:
                  Centre              Star  Star   Sun      Path Limits           Error Limits
  E. Longitude   Latitude      U.T.    Alt    Az   Alt    Limit 1    Limit 2    Limit 3    Limit 4
                                                         Latitude   Latitude   Latitude   Latitude
    ...................................... shortened .............................................
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "
     82  0  0    44 49 58   21  8 50     9   223   -14   45 43 49   43 57  8   45 43 49   43 57  8
     80  0  0    43 42 35   21  8 54    10   222   -16   44 36  8   42 50  3   44 36  8   42 50  3
     78  0  0    42 35  1   21  8 58    12   221   -17   43 28 14   41 42 48   43 28 14   41 42 48
     76  0  0    41 27 26   21  9  3    14   219   -19   42 20 17   40 35 34   42 20 17   40 35 34
     74  0  0    40 20  0   21  9 10    16   218   -21   41 12 27   39 28 31   41 12 27   39 28 31
     72  0  0    39 12 54   21  9 16    18   216   -23   40  4 56   38 21 48   40  4 56   38 21 48
     70  0  0    38  6 17   21  9 24    19   215   -24   38 57 53   37 15 36   38 57 53   37 15 36
     68  0  0    37  0 19   21  9 32    21   213   -26   37 51 28   36 10  3   37 51 28   36 10  3
     66  0  0    35 55  9   21  9 41    23   212   -28   36 45 51   35  5 19   36 45 51   35  5 19
     64  0  0    34 50 56   21  9 51    25   210   -29   35 41 10   34  1 33   35 41 10   34  1 33
     62  0  0    33 47 49   21 10  2    26   209   -31   34 37 34   32 58 52   34 37 34   32 58 52
     60  0  0    32 45 54   21 10 13    28   207   -32   33 35 11   31 57 24   33 35 11   31 57 24
     58  0  0    31 45 19   21 10 25    30   206   -34   32 34  9   30 57 15   32 34  9   30 57 15
     56  0  0    30 46 11   21 10 37    31   204   -35   31 34 33   29 58 34   31 34 33   29 58 34
     54  0  0    29 48 36   21 10 50    33   202   -36   30 36 31   29  1 25   30 36 31   29  1 25
     52  0  0    28 52 40   21 11  4    34   201   -38   29 40  8   28  5 54   29 40  8   28  5 54
     50  0  0    27 58 27   21 11 18    36   199   -39   28 45 30   27 12  6   28 45 30   27 12  6
     48  0  0    27  6  3   21 11 32    37   197   -40   27 52 40   26 20  7   27 52 40   26 20  7
     46  0  0    26 15 32   21 11 47    38   195   -41   27  1 45   25 29 59   27  1 45   25 29 59
     44  0  0    25 26 57   21 12  2    40   193   -42   26 12 46   24 41 47   26 12 46   24 41 47
     42  0  0    24 40 23   21 12 18    41   191   -42   25 25 49   23 55 34   25 25 49   23 55 34
     40  0  0    23 55 51   21 12 34    42   189   -43   24 40 55   23 11 23   24 40 55   23 11 23
     38  0  0    23 13 25   21 12 50    43   186   -44   23 58  9   22 29 17   23 58  9   22 29 17
     36  0  0    22 33  7   21 13  7    43   184   -44   23 17 31   21 49 18   23 17 31   21 49 18
     34  0  0    21 54 59   21 13 23    44   181   -44   22 39  5   21 11 28   22 39  5   21 11 28
     32  0  0    21 19  4   21 13 40    45   179   -45   22  2 52   20 35 49   22  2 52   20 35 49
     30  0  0    20 45 22   21 13 57    45   176   -45   21 28 53   20  2 23   21 28 53   20  2 23
     28  0  0    20 13 55   21 14 14    46   174   -45   20 57 11   19 31 10   20 57 11   19 31 10
     26  0  0    19 44 44   21 14 31    46   171   -44   20 27 47   19  2 13   20 27 47   19  2 13
     24  0  0    19 17 51   21 14 48    46   169   -44   20  0 41   18 35 33   20  0 41   18 35 33
     22  0  0    18 53 16   21 15  5    46   166   -44   19 35 54   18 11  9   19 35 54   18 11  9
     20  0  0    18 31  1   21 15 22    46   164   -43   19 13 28   17 49  4   19 13 28   17 49  4
     18  0  0    18 11  6   21 15 39    46   161   -43   18 53 23   17 29 18   18 53 23   17 29 18
     16  0  0    17 53 31   21 15 56    45   159   -42   18 35 40   17 11 51   18 35 40   17 11 51
     14  0  0    17 38 17   21 16 13    45   156   -41   18 20 20   16 56 44   18 20 20   16 56 44
     12  0  0    17 25 25   21 16 29    44   154   -40   18  7 22   16 43 58   18  7 22   16 43 58
     10  0  0    17 14 56   21 16 45    44   152   -39   17 56 48   16 33 33   17 56 48   16 33 33
      8  0  0    17  6 49   21 17  1    43   150   -38   17 48 37   16 25 29   17 48 37   16 25 29
      6  0  0    17  1  5   21 17 17    42   148   -37   17 42 51   16 19 47   17 42 51   16 19 47
      4  0  0    16 57 44   21 17 33    41   146   -36   17 39 30   16 16 28   17 39 30   16 16 28
      2  0  0    16 56 48   21 17 48    40   144   -34   17 38 33   16 15 31   17 38 33   16 15 31
      0  0  0    16 58 15   21 18  3    39   142   -33   17 40  2   16 16 57   17 40  2   16 16 57
   -  2  0  0    17  2  7   21 18 17    38   140   -32   17 43 56   16 20 46   17 43 56   16 20 46
   -  4  0  0    17  8 23   21 18 32    36   139   -30   17 50 16   16 26 59   17 50 16   16 26 59
   -  6  0  0    17 17  4   21 18 45    35   137   -29   17 59  2   16 35 35   17 59  2   16 35 35
   -  8  0  0    17 28 10   21 18 59    33   136   -27   18 10 15   16 46 36   18 10 15   16 46 36
   - 10  0  0    17 41 42   21 19 11    32   135   -26   18 23 54   17  0  0   18 23 54   17  0  0
   - 12  0  0    17 57 39   21 19 24    30   133   -24   18 39 59   17 15 49   18 39 59   17 15 49
   - 14  0  0    18 16  1   21 19 35    29   132   -22   18 58 31   17 34  2   18 58 31   17 34  2
   - 16  0  0    18 36 49   21 19 47    27   131   -21   19 19 30   17 54 39   19 19 30   17 54 39
   - 18  0  0    19  0  2   21 19 57    26   130   -19   19 42 56   18 17 40   19 42 56   18 17 40
   - 20  0  0    19 25 40   21 20  8    24   129   -17   20  8 47   18 43  5   20  8 47   18 43  5
   - 22  0  0    19 53 43   21 20 17    22   128   -15   20 37  5   19 10 53   20 37  5   19 10 53
   - 24  0  0    20 24 10   21 20 26    20   127   -13   21  7 48   19 41  5   21  7 48   19 41  5
   - 26  0  0    20 57  0   21 20 34    19   126   -11   21 40 56   20 13 39   21 40 56   20 13 39
   - 28  0  0    21 32 14   21 20 41    17   125   -10   22 16 28   20 48 34   22 16 28   20 48 34
    ...................................... 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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