Update for (275) Sapientia - February 26/27, 2003

Jan Manek's update

                  IOTA/IOTA-ES occultation update for
         (275) Sapientia / TYC 1396-00339-1 on February 26/27, 2003
visible from Egypt, W Crete, Italy, W Switzerland, France, England and N Ireland

Summary 

In the night of February 26/27, 2003 a faint 11.7 mag star TYC 1396-00339-1 will be occulted by a 121 km asteroid (275) Sapientia. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.

The updated path shows ~1 path width NE shift with time 0.3 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over Egypt ~23:50 UT, W Crete ~23:52 UT, Italy from SE to NW 23:53.5 - 23:56.0 UT with Rome, Turin an Milan in path, W Switzerland ~23:56.3 UT, France ~23:56.5 - 23:57.8 UT, England ~23:58.5 UT and N Ireland ~23:59.5 UT. Please check the path chart for details.

Other source gives diameter 103 km instead of 121 km. The actual path may be narrower than the one on chart.
Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: February 26, 2003 @ 23:56 UT (Europe)
 * magnitude of target star: 11.7
 * magnitude drop [mag]: 1.1
 * estimated maximum duration [s]: 18.0
 * path description: given above
 * Goffin's original chart reference: A03_0225

The occultation path:
 * approximate ground width [km]: 150
 * uncertainty [path widths]: 0.5
 * uncertainty in time [s]: 9
 * 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 1396-00339-1
 * constellation: Cancer
 * J2000 position [h,m,s; o,',"]: 08h 43m 24.4897s; +18o 58' 37.873"
 * position source: recent UCAC position combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.04" (0.03", 0.03")
 * V mag [mag]: 11.68
 * B-V [mag]: +0.31
 * remarks:
    Target star is in mid-south Cancer, about 0.9 degrees NNE of 3.9 mag star delta Cancri = SAO 98087
    or just SW of Beehive cluster M44.
    !!! 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 2.0x2.0 degrees
 * limiting magnitude is 12.5
 * labeled stars have indicated SAO numbers
 * remarks: Second chart shows 30' blowup to show correctly the star in the field.








Data for the minor planet:
 * general information:
     number, name: (275) Sapientia
     approx. diameter [km]: 121
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 107 USNO, 18 TMO
     number of rejected observations: 21 USNO, 1 TMO
     time covered by the observations: 1997 11 29 - 2003 02 22
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.05", 0.05"
     remarks: Other source gives diameter 103 km instead of 121 km. The actual path may be narrower than the one on chart.

Data for the event:
 * UT date and time of least geocentric approach: 23:57.5 UT
 * approx. V mag of minor planet at event [mag]: 12.3
 * geocentric parallax of minor planet ["]: 6.019
 * magnitude drop [mag]: 1.1
 * estimated maximum duration [s]: 18.0
 * apparent motion of minor planet ["/h]: 22.84
 * angular distance to moon, phase of moon [deg,%]: 161, 17%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Feb 26
275 Sapientia
23h 57.5m UT
96-00339-1  11.7    8 43 24.490 18 58 37.87TYC 1396-00339-1
12.3    121   18.0   1.461    -1.412     10.92
  -24.946  18.975   183.84   -8.58
 23.9587   .28685   .52583 -3.33172  1.81630  0.00270 -0.00080
2000    335.8719812003 220.0000037.262581 134.2917354.770774  0.162099232.773751292.324128348.855   0.15
RATE 2.1335490 .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
     33  0  0    28 14 45   23 49 33    38   -58   29  6  3   27 24  9
     32  0  0    28 55 38   23 49 46    39   -58   29 47 11   28  4 48
     31  0  0    29 36 43   23 50  1    40   -58   30 28 30   28 45 39
     30  0  0    30 17 58   23 50 15    41   -59   31 10  0   29 26 41
     29  0  0    30 59 23   23 50 29    42   -59   31 51 39   30  7 52
     28  0  0    31 40 54   23 50 44    42   -59   32 33 25   30 49 10
     27  0  0    32 22 32   23 50 59    43   -59   33 15 16   31 30 35
     26  0  0    33  4 15   23 51 14    44   -59   33 57 12   32 12  5
     25  0  0    33 46  1   23 51 29    45   -59   34 39 11   32 53 38
     24  0  0    34 27 48   23 51 44    45   -59   35 21 11   33 35 13
     23  0  0    35  9 35   23 51 60    46   -59   36  3 11   34 16 48
     22  0  0    35 51 20   23 52 15    47   -59   36 45  8   34 58 23
     21  0  0    36 33  3   23 52 31    47   -59   37 27  3   35 39 54
     20  0  0    37 14 41   23 52 46    48   -58   38  8 52   36 21 21
     19  0  0    37 56 13   23 53  2    48   -58   38 50 34   37  2 43
     18  0  0    38 37 37   23 53 17    49   -58   39 32  9   37 43 57
     17  0  0    39 18 52   23 53 33    49   -57   40 13 33   38 25  3
     16  0  0    39 59 56   23 53 49    50   -57   40 54 47   39  5 58
     15  0  0    40 40 48   23 54  4    50   -57   41 35 47   39 46 42
     14  0  0    41 21 26   23 54 20    51   -56   42 16 34   40 27 13
     13  0  0    42  1 49   23 54 36    51   -56   42 57  4   41  7 29
     12  0  0    42 41 56   23 54 51    51   -55   43 37 18   41 47 30
     11  0  0    43 21 45   23 55  7    52   -55   44 17 13   42 27 13
     10  0  0    44  1 15   23 55 22    52   -54   44 56 48   43  6 38
      9  0  0    44 40 24   23 55 37    52   -54   45 36  1   43 45 43
      8  0  0    45 19 11   23 55 53    52   -53   46 14 53   44 24 27
      7  0  0    45 57 36   23 56  8    53   -53   46 53 20   45  2 48
      6  0  0    46 35 36   23 56 23    53   -52   47 31 23   45 40 46
      5  0  0    47 13 11   23 56 37    53   -51   48  8 59   46 18 20
      4  0  0    47 50 19   23 56 52    53   -51   48 46  9   46 55 28
      3  0  0    48 27  1   23 57  6    53   -50   49 22 50   47 32  9
      2  0  0    49  3 14   23 57 21    53   -50   49 59  2   48  8 23
      1  0  0    49 38 57   23 57 35    53   -49   50 34 44   48 44  8
      0  0  0    50 14 11   23 57 49    53   -48   51  9 55   49 19 24
   -  1  0  0    50 48 54   23 58  3    53   -48   51 44 35   49 54 10
   -  2  0  0    51 23  5   23 58 16    53   -47   52 18 42   50 28 25
   -  3  0  0    51 56 45   23 58 30    53   -46   52 52 17   51  2  9
   -  4  0  0    52 29 51   23 58 43    53   -46   53 25 18   51 35 21
   -  5  0  0    53  2 25   23 58 56    52   -45   53 57 45   52  8  0
   -  6  0  0    53 34 24   23 59  9    52   -44   54 29 37   52 40  7
   -  7  0  0    54  5 50   23 59 21    52   -44   55  0 55   53 11 40
   -  8  0  0    54 36 41   23 59 34    52   -43   55 31 38   53 42 39
   -  9  0  0    55  6 57   23 59 46    52   -43   56  1 45   54 13  4
   - 10  0  0    55 36 39   23 59 58    52   -42   56 31 17   54 42 55
   - 11  0  0    56  5 45   24  0  9    51   -41   57  0 13   55 12 11
   - 12  0  0    56 34 17   24  0 21    51   -41   57 28 34   55 40 53
   - 13  0  0    57  2 13   24  0 32    51   -40   57 56 18   56  8 60
   ........................... 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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