Update for (1149) Volga - July 16/17, 2003

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
      (1149) Volga / TYC 0543-00599-1 = PPM 172161 on July 16/17, 2003
           visible N Morocco and Newfoundland, N Quebec in Canada

Summary 

In the night of July 16/17, 2003 a bright 9.6 mag star TYC 0543-00599-1 = PPM 172161 will be occulted by a 57 km asteroid (1149) Volga. This update is based on USNO/Flagstaff astrometry for the asteroid and UCAC2-beta star position.

The updated path shows ~4 path width south shift with time ~0.3 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs due to south shift over N Morocco ~4:01 UT, later over Newfoundland ~4:10 UT and N Quebec ~4:11 UT in Canada. 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 17, 2003 @ 04:11 UT (Canada)
 * magnitude of target star: 9.6
 * magnitude drop [mag]: 5.2
 * estimated maximum duration [s]: 7.1
 * path description: given above
 * Goffin's original chart reference: A03_0752

The occultation path:
 * approximate ground width [km]: 75
 * uncertainty [path widths]: 1.5
 * uncertainty in time [s]: 11
 * 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 0543-00599-1 = PPM 172161
 * constellation: Aquarius
 * J2000 position [h,m,s; o,',"]: 21h 43m 13.2774s; +01o 25' 34.510"
 * position source: recent UCAC2 beta
 * estimated accuracy ["]: 0.02" (0.01", 0.02")
 * V mag [mag]: 9.56
 * B-V [mag]: +1.31
 * remarks:
    Target star is in north Aquarius, about 5.9 degrees WNW of 2.9 mag star alpha Aquarii = SAO 145862
    or 18' NE of 5.6 mag star 26 Aquarii = SAO 126997.
    !!! 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 13.0
 * 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: (1149) Volga
     approx. diameter [km]: 57
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 99 USNO
     number of rejected observations: 20 USNO
     time covered by the observations: 1998 06 16 - 2003 06 26
     rms residuals ["] (RA,DE): 0.09", 0.10"
     estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 04:02.5 UT
 * approx. V mag of minor planet at event [mag]: 14.8
 * geocentric parallax of minor planet ["]: 4.754
 * magnitude drop [mag]: 5.2
 * estimated maximum duration [s]: 7.1
 * apparent motion of minor planet ["/h]: 21.45
 * angular distance to moon, phase of moon [deg,%]: 21, 87%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Jul 17
1149 Volga
 4h  2.5m UT
43-00599-1   9.6   21 43 13.277  1 25 34.51TYC 0543-00599-1
14.8     57    7.1   1.850    -1.323      8.20
  -29.391   1.425  -239.09   21.27
  4.0414   .23398   .56526 -4.16701  1.72692 -0.00257 -0.00211
2000    309.3959182003 710.00000113.328163261.80788711.747718 0.097517772.898401222.6157555910.55   0.15
RATE 1.9974060 .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  '  "
     14  0  0    25 33 39    3 57  9    43   246    -6   25 54 35   25 12 49   26 57 11   24 11 46
     12  0  0    26 16 49    3 57 32    44   244    -7   26 37 50   25 55 54   27 40 43   24 54 35
     10  0  0    27  0 56    3 57 55    45   242    -9   27 22  2   26 39 55   28 25 11   25 38 21
      8  0  0    27 45 56    3 58 18    46   239   -10   28  7  8   27 24 50   29 10 33   26 23  1
      6  0  0    28 31 45    3 58 42    47   237   -11   28 53  2   28 10 34   29 56 44   27  8 30
      4  0  0    29 18 19    3 59  6    48   234   -12   29 39 41   28 57  3   30 43 39   27 54 44
      2  0  0    30  5 32    3 59 30    49   231   -13   30 27  0   29 44 11   31 31 13   28 41 38
      0  0  0    30 53 21    3 59 55    50   228   -14   31 14 54   30 31 55   32 19 23   29 29  8
   -  2  0  0    31 41 41    4  0 19    51   225   -14   32  3 19   31 20 10   33  8  2   30 17 10
   -  4  0  0    32 30 27    4  0 44    51   222   -15   32 52  9   32  8 52   33 57  7   31  5 38
   -  6  0  0    33 19 34    4  1  9    52   219   -16   33 41 20   32 57 54   34 46 32   31 54 28
   -  8  0  0    34  8 56    4  1 33    52   216   -17   34 30 47   33 47 13   35 36 12   32 43 35
   - 10  0  0    34 58 31    4  1 58    52   212   -17   35 20 25   34 36 43   36 26  2   33 32 54
   - 12  0  0    35 48 11    4  2 22    52   209   -18   36 10  9   35 26 20   37 15 57   34 22 20
   - 14  0  0    36 37 52    4  2 47    52   206   -18   36 59 54   36 15 58   38  5 53   35 11 49
   - 16  0  0    37 27 30    4  3 11    52   202   -19   37 49 35   37  5 32   38 55 43   36  1 15
    ...................................... shortened .............................................
   - 46  0  0    48 53 57    4  8 20    41   160   -19   49 15 58   48 32  4   50 21 52   47 27 58
   - 48  0  0    49 33  5    4  8 36    40   157   -18   49 55  2   49 11 15   51  0 45   48  7 20
   - 50  0  0    50 11  8    4  8 52    39   155   -18   50 33  2   49 49 23   51 38 33   48 45 38
   - 52  0  0    50 48  6    4  9  7    38   153   -18   51  9 54   50 26 24   52 15 12   49 22 51
   - 54  0  0    51 23 55    4  9 22    37   151   -17   51 45 40   51  2 18   52 50 44   49 58 58
   - 56  0  0    51 58 36    4  9 35    35   149   -17   52 20 16   51 37  4   53 25  5   50 33 58
   - 58  0  0    52 32  8    4  9 49    34   147   -16   52 53 43   52 10 41   53 58 16   51  7 48
   - 60  0  0    53  4 30    4 10  1    33   145   -16   53 25 59   52 43  7   54 30 17   51 40 30
   - 62  0  0    53 35 41    4 10 14    32   143   -15   53 57  5   53 14 24   55  1  6   52 12  2
   - 64  0  0    54  5 42    4 10 25    31   141   -15   54 27  0   53 44 30   55 30 45   52 42 23
   - 66  0  0    54 34 31    4 10 36    30   139   -14   54 55 44   54 13 25   55 59 11   53 11 34
   - 68  0  0    55  2 10    4 10 47    29   137   -14   55 23 17   54 41 10   56 26 27   53 39 35
   - 70  0  0    55 28 38    4 10 57    28   135   -13   55 49 40   55  7 43   56 52 32   54  6 25
   - 72  0  0    55 53 56    4 11  6    27   133   -12   56 14 52   55 33  7   57 17 27   54 32  4
   - 74  0  0    56 18  4    4 11 15    26   131   -12   56 38 54   55 57 20   57 41 11   54 56 34
   - 76  0  0    56 41  2    4 11 24    24   130   -11   57  1 46   56 20 24   58  3 46   55 19 53
   - 78  0  0    57  2 51    4 11 32    23   128   -11   57 23 30   56 42 18   58 25 13   55 42  3
   - 80  0  0    57 23 31    4 11 40    22   126   -10   57 44  5   57  3  4   58 45 31   56  3  5
   - 82  0  0    57 43  4    4 11 47    21   124    -9   58  3 32   57 22 42   59  4 42   56 22 58
   - 84  0  0    58  1 29    4 11 54    20   122    -9   58 21 52   57 41 12   59 22 46   56 41 43
   - 86  0  0    58 18 48    4 12  0    19   121    -8   58 39  5   57 58 36   59 39 44   56 59 21
   - 88  0  0    58 35  0    4 12  6    18   119    -7   58 55 13   58 14 53   59 55 37   57 15 52
   - 90  0  0    58 50  7    4 12 12    17   117    -7   59 10 15   58 30  5   60 10 25   57 31 17
   - 92  0  0    59  4 10    4 12 17    16   115    -6   59 24 13   58 44 12   60 24 10   57 45 36
   - 94  0  0    59 17  8    4 12 22    15   114    -5   59 37  8   58 57 14   60 36 51   57 58 51
   - 96  0  0    59 29  3    4 12 27    14   112    -5   59 48 59   59  9 13   60 48 30   58 11  1
    ...................................... 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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