Update for (535) Montague - April 22/23, 2003 - South Africa

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
             (535) Montague / HIP 81899 = SAO 160063 on April 22/23, 2003
             visible from South Africa, Brazilia, N Paraguay and S Bolivia

Summary 

In the night of April 22/23, 2003 a bright 9.9 mag star HIP 81899 = SAO 160063 will be occulted by a 77 km asteroid (535) Montague. This update is based on USNO/Flagstaff astrometry for the asteroid and Hipparcos star position.

The updated path shows ~5 path width south shift with time 0.7 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over South Africa 1:20-1:25 UT with Durban on north limit, later Brazilia around 1:42 UT with Sao Paulo on north limit, N Paraguay ~1:43.5 UT and S Bolivia ~1:44.2 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 09, 2003 @ 01:22 UT (South Africa)
                                                       01:43 UT (South America)
 * magnitude of target star: 9.9
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 15.8
 * path description: given above
 * Goffin's original chart reference: A03_0447

The occultation path:
 * approximate ground width [km]: 80
 * uncertainty [path widths]: 1.1
 * uncertainty in time [s]: 18
 * map: below
 * remarks: Path uncertainties are given according to nominal star
    position errors and expected asteroid positional accuracy.

Data for the target star:
 * name: HIP 81899 = SAO 160063 = PPM 232082
 * constellation: Ophiuchus
 * J2000 position [h,m,s; o,',"]: 16h 43m 43.3860s; -17o 30' 53.739"
 * position source: Hipparcos
 * estimated accuracy ["]: 0.05" (0.03", 0.03")
 * V mag [mag]: 9.94
 * B-V [mag]: +0.39
 * remarks:
    Target star is in south Ophiuchus, about 34' NE of 4.9 mag star SAO 160046.
    !!! 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 is 30' blowup to show correctly the target star in the field.











Data for the minor planet:
 * general information:
     number, name: (535) Montague
     approx. diameter [km]: 77
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 113 USNO
     number of rejected observations: 12 USNO
     time covered by the observations: 1998 02 12 - 2003 04 08
     rms residuals ["] (RA,DE): 0.08", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 01:23.7 UT
 * approx. V mag of minor planet at event [mag]: 13.5
 * geocentric parallax of minor planet ["]: 5.152
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 15.8
 * apparent motion of minor planet ["/h]: 14.15
 * angular distance to moon, phase of moon [deg,%]: 46, 55%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Apr 23
535 Montague
 1h 23.7m UT
HIP 81899    9.9   16 43 43.386-17 30 53.74
13.5     77   15.8   1.707    -0.991     -0.38
   19.313 -17.515  -201.31   12.34
  1.3954   .00692  -.22674 -2.74656 -0.07340 -0.00359  0.00012
2000    82.66669292003 421.0000066.507224 84.887209 6.782884  0.023237022.569028392.509331839.485   0.15
RATE 2.3935952 .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  '  "
     36  0  0   -29 54  4    1 18 50    71   307   -35  -29 32 34  -30 15 36  -28 47  5  -31  1 20
     35  0  0   -29 59 14    1 19  8    72   310   -36  -29 37 45  -30 20 45  -28 52 17  -31  6 29
     34  0  0   -30  4 10    1 19 26    72   312   -37  -29 42 41  -30 25 40  -28 57 15  -31 11 23
     33  0  0   -30  8 51    1 19 44    73   314   -38  -29 47 23  -30 30 22  -29  1 58  -31 16  3
     32  0  0   -30 13 19    1 20  2    73   317   -39  -29 51 51  -30 34 48  -29  6 26  -31 20 29
     31  0  0   -30 17 32    1 20 20    74   320   -39  -29 56  4  -30 39  1  -29 10 41  -31 24 41
     30  0  0   -30 21 31    1 20 39    74   322   -40  -30  0  4  -30 43  0  -29 14 41  -31 28 38
     29  0  0   -30 25 15    1 20 57    75   325   -41  -30  3 49  -30 46 44  -29 18 27  -31 32 22
     28  0  0   -30 28 46    1 21 15    75   328   -42  -30  7 19  -30 50 14  -29 21 58  -31 35 51
     27  0  0   -30 32  2    1 21 33    75   332   -42  -30 10 36  -30 53 29  -29 25 15  -31 39  6
     26  0  0   -30 35  3    1 21 51    76   335   -43  -30 13 38  -30 56 31  -29 28 18  -31 42  7
     25  0  0   -30 37 51    1 22  9    76   339   -44  -30 16 25  -30 59 18  -29 31  6  -31 44 53
     24  0  0   -30 40 24    1 22 27    76   342   -45  -30 18 59  -31  1 51  -29 33 40  -31 47 25
     23  0  0   -30 42 43    1 22 46    76   346   -45  -30 21 18  -31  4  9  -29 36  0  -31 49 43
     22  0  0   -30 44 47    1 23  4    77   350   -46  -30 23 22  -31  6 13  -29 38  5  -31 51 47
     21  0  0   -30 46 37    1 23 22    77   353   -47  -30 25 13  -31  8  3  -29 39 56  -31 53 36
     20  0  0   -30 48 13    1 23 40    77   357   -48  -30 26 49  -31  9 39  -29 41 32  -31 55 12
     19  0  0   -30 49 34    1 23 58    77     1   -48  -30 28 10  -31 11  0  -29 42 54  -31 56 32
     18  0  0   -30 50 41    1 24 17    77     5   -49  -30 29 17  -31 12  7  -29 44  1  -31 57 39
     17  0  0   -30 51 34    1 24 35    76     9   -50  -30 30 10  -31 13  0  -29 44 54  -31 58 31
     16  0  0   -30 52 12    1 24 53    76    13   -51  -30 30 48  -31 13 38  -29 45 33  -31 59  9
     15  0  0   -30 52 36    1 25 11    76    16   -51  -30 31 12  -31 14  2  -29 45 57  -31 59 33
     14  0  0   -30 52 46    1 25 29    76    20   -52  -30 31 22  -31 14 11  -29 46  6  -31 59 43
     13  0  0   -30 52 41    1 25 47    76    23   -53  -30 31 17  -31 14  6  -29 46  2  -31 59 38
     12  0  0   -30 52 22    1 26  5    75    27   -54  -30 30 58  -31 13 47  -29 45 42  -31 59 19
     11  0  0   -30 51 48    1 26 23    75    30   -54  -30 30 24  -31 13 14  -29 45  8  -31 58 45
    ...................................... shortened .............................................
   - 39  0  0   -25 19 33    1 39 55    39    93   -72  -24 57 40  -25 41 28  -24 11 21  -26 28  3
   - 40  0  0   -25  6 58    1 40  8    38    93   -71  -24 45  4  -25 28 54  -23 58 43  -26 15 31
   - 41  0  0   -24 54 10    1 40 21    37    94   -71  -24 32 15  -25 16  7  -23 45 52  -26  2 46
   - 42  0  0   -24 41  9    1 40 33    37    94   -70  -24 19 13  -25  3  7  -23 32 48  -25 49 48
   - 43  0  0   -24 27 55    1 40 45    36    95   -70  -24  5 58  -24 49 54  -23 19 31  -25 36 37
   - 44  0  0   -24 14 28    1 40 58    35    95   -69  -23 52 30  -24 36 28  -23  6  1  -25 23 13
   - 45  0  0   -24  0 49    1 41  9    34    96   -68  -23 38 49  -24 22 50  -22 52 19  -25  9 37
   - 46  0  0   -23 46 56    1 41 21    33    96   -68  -23 24 56  -24  8 58  -22 38 24  -24 55 47
   - 47  0  0   -23 32 52    1 41 33    32    97   -67  -23 10 51  -23 54 55  -22 24 16  -24 41 46
   - 48  0  0   -23 18 35    1 41 44    31    97   -66  -22 56 33  -23 40 38  -22  9 56  -24 27 32
   - 49  0  0   -23  4  5    1 41 55    30    98   -66  -22 42  2  -23 26 10  -21 55 24  -24 13  5
   - 50  0  0   -22 49 24    1 42  5    29    98   -65  -22 27 20  -23 11 30  -21 40 40  -23 58 27
   - 51  0  0   -22 34 31    1 42 16    29    98   -64  -22 12 26  -22 56 37  -21 25 43  -23 43 36
   - 52  0  0   -22 19 26    1 42 26    28    99   -63  -21 57 20  -22 41 33  -21 10 35  -23 28 34
   - 53  0  0   -22  4  9    1 42 36    27    99   -63  -21 42  2  -22 26 17  -20 55 16  -23 13 20
   - 54  0  0   -21 48 41    1 42 45    26   100   -62  -21 26 33  -22 10 50  -20 39 45  -22 57 55
   - 55  0  0   -21 33  1    1 42 55    25   100   -61  -21 10 53  -21 55 12  -20 24  3  -22 42 18
   - 56  0  0   -21 17 11    1 43  4    24   100   -60  -20 55  1  -21 39 22  -20  8  9  -22 26 31
   - 57  0  0   -21  1  9    1 43 13    23   101   -59  -20 38 59  -21 23 21  -19 52  5  -22 10 32
   - 58  0  0   -20 44 57    1 43 21    22   101   -58  -20 22 46  -21  7 10  -19 35 50  -21 54 22
   - 59  0  0   -20 28 34    1 43 29    21   102   -58  -20  6 22  -20 50 48  -19 19 25  -21 38  2
   - 60  0  0   -20 12  1    1 43 37    20   102   -57  -19 49 48  -20 34 16  -19  2 49  -21 21 31
   - 61  0  0   -19 55 18    1 43 45    19   102   -56  -19 33  4  -20 17 33  -18 46  3  -21  4 51
   - 62  0  0   -19 38 25    1 43 52    18   103   -55  -19 16 11  -20  0 41  -18 29  8  -20 48  0
   - 63  0  0   -19 21 22    1 43 59    17   103   -54  -18 59  7  -19 43 39  -18 12  3  -20 31  0
   - 64  0  0   -19  4 10    1 44  5    16   103   -53  -18 41 54  -19 26 28  -17 54 48  -20 13 50
   - 65  0  0   -18 46 49    1 44 11    15   104   -52  -18 24 32  -19  9  7  -17 37 25  -19 56 31
   - 66  0  0   -18 29 18    1 44 17    14   104   -51  -18  7  1  -18 51 37  -17 19 52  -19 39  3
   - 67  0  0   -18 11 39    1 44 23    13   104   -51  -17 49 22  -18 33 59  -17  2 11  -19 21 26
   - 68  0  0   -17 53 52    1 44 28    12   105   -50  -17 31 34  -18 16 13  -16 44 22  -19  3 41
   - 69  0  0   -17 35 57    1 44 33    11   105   -49  -17 13 38  -17 58 18  -16 26 25  -18 45 47
   - 70  0  0   -17 17 54    1 44 37    10   105   -48  -16 55 34  -17 40 15  -16  8 19  -18 27 46
   - 71  0  0   -16 59 43    1 44 41    10   106   -47  -16 37 23  -17 22  5  -15 50  7  -18  9 37
   - 72  0  0   -16 41 25    1 44 45     9   106   -46  -16 19  4  -17  3 48  -15 31 47  -17 51 21
   - 73  0  0   -16 23  0    1 44 48     8   106   -45  -16  0 39  -16 45 24  -15 13 21  -17 32 58
   - 74  0  0   -16  4 29    1 44 51     7   106   -44  -15 42  7  -16 26 53  -14 54 48  -17 14 28
   - 75  0  0   -15 45 52    1 44 53     6   107   -43  -15 23 29  -16  8 16  -14 36  9  -16 55 52
   - 76  0  0   -15 27  8    1 44 56     5   107   -42  -15  4 45  -15 49 33  -14 17 25  -16 37 10
   - 77  0  0   -15  8 19    1 44 57     4   107   -41  -14 45 56  -15 30 44  -13 58 34  -16 18 22
    ...................................... shortened .............................................

----------------------------------------------------------------------------
Jan Manek
Stefanik Observatory                Private :
Petrin 205                          Werichova 950
118 46  Praha 1                     152 00  Praha 5 - Barrandov     |_|_|
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Internet : jan.manek@worldonline.cz                                |-O-O-|
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