Update for (42) Isis - April 2/3, 2003

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
             (42) Isis / HIP 27017 = SAO 77468 on April 2/3, 2003
                visible from S Finland, Russia and Khazachstan

Summary 

In the evening of April 2/3, 2003 a bright 9.0 mag star HIP 27017 = SAO 77468 will be occulted by a 107 km asteroid (42) Isis. This update is based on USNO/Flagstaff sand TMO astrometry for the asteroid and recent UCAC star position.

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

Updated path runs over S Finland ~17:53.7 UT, Russia around 17:54.4 UT and Khazachstan around 17:55.3 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 2, 2003 @ 17:55 UT (Europe)
 * magnitude of target star: 9.0
 * magnitude drop [mag]: 4.1
 * estimated maximum duration [s]: 4.6
 * path description: given above
 * Goffin's original chart reference: A03_0409

The occultation path:
 * approximate ground width [km]: 140
 * uncertainty [path widths]: 0.9
 * uncertainty in time [s]: 4
 * 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 27017 = SAO 77468 = PPM 94759 = TYC 1870-01055-1
 * constellation: Taurus
 * J2000 position [h,m,s; o,',"]: 05h 43m 49.7355s; +26o 25' 34.823"
 * position source: recent UCAC position combined with HIP proper motion
 * estimated accuracy ["]: 0.03" (0.01", 0.03")
 * V mag [mag]: 8.99
 * B-V [mag]: +0.00
 * remarks:
    Target star is in NE Taurus, about 4.5 degrees SE of 1.7 mag star beta Tauri = SAO 77168.
    !!! 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 12.0
 * 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: (42) Isis
     approx. diameter [km]: 107
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 93 USNO, 40 TMO
     number of rejected observations: 6 USNO, 5 TMO
     time covered by the observations: 1997 05 10 - 2003 02 23
     rms residuals ["] (RA,DE): 0.05", 0.05"
     estimated positional accuracy at epoch of event ["]: 0.03", 0.03"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 17:52.2 UT
 * approx. V mag of minor planet at event [mag]: 13.1
 * geocentric parallax of minor planet ["]: 2.975
 * magnitude drop [mag]: 4.1
 * estimated maximum duration [s]: 4.6
 * apparent motion of minor planet ["/h]: 39.44
 * angular distance to moon, phase of moon [deg,%]: 64, 1%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Apr 02
42 Isis
17h 52.2m UT
HIP 27017    9.0    5 43 49.736 26 25 34.82
13.1    107    4.6   2.956     2.930      2.74
  -12.764  26.426   -87.15    4.97
 17.8704  -.04377   .62077 13.22681  0.92059  0.00556  0.00024
2000    128.6719762003 4 1.00000236.01791884.566932 8.536394  0.223393922.441702281.896240857.535   0.15
RATE 2.5832420 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================

Calculator(s): Jan Manek








Path coordinates:
                  Centre              Star  Star   Sun      Path Limits
                  Centre               Altitude       Path Limits
  E. Longitude   Latitude      U.T.   star   sun   Limit 1    Limit 2
                                                   Latitude   Latitude
  ............................. shortened ..................................
      o  '  "     o  '  "    h  m  s     o     o    o  '  "    o  '  "
     20  0  0    64 12 55   17 53 30    47    -3   63 35  4   64 51  8
     21  0  0    64  6 23   17 53 32    46    -3   63 28 26   64 44 41
     22  0  0    63 59 33   17 53 34    46    -4   63 21 30   64 37 57
     23  0  0    63 52 25   17 53 36    46    -4   63 14 16   64 30 55
     24  0  0    63 44 59   17 53 38    46    -5   63  6 44   64 23 36
     25  0  0    63 37 15   17 53 40    45    -5   62 58 54   64 15 58
     26  0  0    63 29 13   17 53 42    45    -6   62 50 45   64  8  2
     27  0  0    63 20 52   17 53 44    45    -6   62 42 18   63 59 48
     28  0  0    63 12 12   17 53 46    44    -7   62 33 31   63 51 16
     29  0  0    63  3 14   17 53 48    44    -7   62 24 25   63 42 24
     30  0  0    62 53 56   17 53 50    44    -8   62 15  0   63 33 13
     31  0  0    62 44 18   17 53 52    44    -8   62  5 15   63 23 43
     32  0  0    62 34 21   17 53 54    43    -9   61 55 10   63 13 54
     33  0  0    62 24  4   17 53 57    43    -9   61 44 46   63  3 45
     34  0  0    62 13 26   17 53 59    43   -10   61 34  0   62 53 15
     35  0  0    62  2 28   17 54  1    42   -10   61 22 54   62 42 26
     36  0  0    61 51 10   17 54  3    42   -11   61 11 28   62 31 16
     37  0  0    61 39 30   17 54  5    42   -11   60 59 40   62 19 45
     38  0  0    61 27 30   17 54  7    41   -12   60 47 31   62  7 53
     39  0  0    61 15  8   17 54  9    41   -12   60 35  0   61 55 39
     40  0  0    61  2 24   17 54 11    40   -13   60 22  8   61 43  4
     41  0  0    60 49 18   17 54 13    40   -13   60  8 53   61 30  8
     42  0  0    60 35 50   17 54 15    40   -14   59 55 17   61 16 49
     43  0  0    60 21 60   17 54 18    39   -14   59 41 17   61  3  7
     44  0  0    60  7 46   17 54 20    39   -15   59 26 55   60 49  4
     45  0  0    59 53 10   17 54 22    38   -15   59 12 10   60 34 37
     46  0  0    59 38 11   17 54 24    38   -16   58 57  2   60 19 47
     47  0  0    59 22 48   17 54 26    37   -16   58 41 30   60  4 34
     48  0  0    59  7  2   17 54 28    37   -17   58 25 34   59 48 57
     49  0  0    58 50 52   17 54 30    37   -18   58  9 15   59 32 56
     50  0  0    58 34 17   17 54 32    36   -18   57 52 31   59 16 31
     51  0  0    58 17 19   17 54 35    36   -19   57 35 23   58 59 42
     52  0  0    57 59 55   17 54 37    35   -19   57 17 51   58 42 28
     53  0  0    57 42  7   17 54 39    35   -20   56 59 54   58 24 49
     54  0  0    57 23 55   17 54 41    34   -20   56 41 32   58  6 46
     55  0  0    57  5 17   17 54 43    34   -21   56 22 45   57 48 18
     56  0  0    56 46 14   17 54 45    33   -22   56  3 33   57 29 24
     57  0  0    56 26 46   17 54 47    32   -22   55 43 56   57 10  5
     58  0  0    56  6 52   17 54 49    32   -23   55 23 54   56 50 20
     59  0  0    55 46 33   17 54 52    31   -23   55  3 26   56 30 10
     60  0  0    55 25 49   17 54 54    31   -24   54 42 33   56  9 34
     61  0  0    55  4 38   17 54 56    30   -25   54 21 15   55 48 33
     62  0  0    54 43  3   17 54 58    29   -25   53 59 31   55 27  6
     63  0  0    54 21  1   17 54 60    29   -26   53 37 22   55  5 12
     64  0  0    53 58 35   17 55  2    28   -27   53 14 47   54 42 54
     65  0  0    53 35 42   17 55  4    28   -27   52 51 47   54 20  9
     66  0  0    53 12 25   17 55  6    27   -28   52 28 22   53 56 59
     67  0  0    52 48 42   17 55  8    26   -29   52  4 32   53 33 23
     68  0  0    52 24 34   17 55 10    26   -29   51 40 18   53  9 23
     69  0  0    52  0  1   17 55 12    25   -30   51 15 38   52 44 56
     70  0  0    51 35  3   17 55 14    24   -30   50 50 35   52 20  5
     71  0  0    51  9 42   17 55 16    24   -31   50 25  7   51 54 50
     72  0  0    50 43 56   17 55 17    23   -32   49 59 15   51 29  9
     73  0  0    50 17 46   17 55 19    22   -32   49 33  1   51  3  5
     74  0  0    49 51 13   17 55 21    21   -33   49  6 23   50 36 37
     75  0  0    49 24 17   17 55 23    21   -34   48 39 22   50  9 46
     76  0  0    48 56 59   17 55 24    20   -34   48 11 60   49 42 32
     77  0  0    48 29 18   17 55 26    19   -35   47 44 16   49 14 55
     78  0  0    48  1 17   17 55 28    18   -36   47 16 11   48 46 57
     79  0  0    47 32 54   17 55 29    17   -36   46 47 45   48 18 38
     80  0  0    47  4 11   17 55 31    17   -37   46 18 60   47 49 58
     81  0  0    46 35  9   17 55 32    16   -38   45 49 55   47 20 57
     82  0  0    46  5 48   17 55 34    15   -38   45 20 32   46 51 38
     83  0  0    45 36  8   17 55 35    14   -39   44 50 52   46 22  0
     84  0  0    45  6 12   17 55 36    13   -40   44 20 54   45 52  4
     85  0  0    44 35 59   17 55 37    12   -40   43 50 41   45 21 52
     86  0  0    44  5 30   17 55 38    12   -41   43 20 12   44 51 23
     87  0  0    43 34 46   17 55 39    11   -41   42 49 29   44 20 39
     88  0  0    43  3 49   17 55 40    10   -42   42 18 32   43 49 41
     89  0  0    42 32 39   17 55 41     9   -43   41 47 24   43 18 29
     90  0  0    42  1 17   17 55 42     8   -43   41 16  3   42 47  5
     91  0  0    41 29 44   17 55 43     7   -44   40 44 32   42 15 30
     93  0  0    40 26  9   17 55 44     5   -45   39 41  3   41 11 50
  ............................. 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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