Update for (712) Boliviana - January 6/7, 2002 - South Africa and South America

Jan Manek's update

                       IOTA/IOTA-ES occultation update for
       (712) Boliviana / TYC 0715-01351-1 = SAO 113140 January 6/7, 2002
             visible from N South Africa, Botswana, middle Namibia
                           S Uruguay and middle Argentina


Summary 

In the night of January 6/7, 2002 a 9.8 mag star TYC 0715-01351-1 = SAO 113140 will be occulted by a 132 km asteroid (712) Boliviana. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Tycho-2 star position.

The updated path shows ~1 path width south with time ~0.4 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over south Mozambique ~00:52 UT, north South Africa ~00:52.5 UT, Botswana ~00:53 UT and middle Namibia ~00:54 UT in Africa and after passing Atlantic Ocean path runs over south Uruguay just north of Montevideo ~01:08 UT and middle Argentina with Buenos Aires in path ~01:09 UT. Please check the path chart for details.

The event at one glimpse:
 * date and approx. UT time of event: January 7, 2002 @ 00:53 UT (S.Africa)
                                                        01:09 UT (S.America)
 * magnitude of target star: 9.8
 * magnitude drop [mag]: 1.7
 * estimated maximum duration [s]: 17.9
 * path description: given above
 * Goffin's original chart reference: A02_0145

The occultation path:
 * approximate ground width [km]: 160
 * uncertainty [path widths]: 0.75
 * uncertainty in time [s]: 15
 * map: below
 * remarks: Path uncertainities are given according to nominal star
    position errors and expected asteroid positional accuracy.

Data for the target star:
 * name: SAO 113140 = PPM 149461 = TYC 0715-01351-1
 * constellation: Orion
 * J2000 position [h,m,s; o,',"]: 05h 47m 28.1743s; +07o 31' 51.901"
 * position source: Tycho-2
 * estimated accuracy ["]: 0.05" (0.03", 0.04")
 * V mag [mag]: 9.77
 * B-V [mag]: +1.35
 * remarks:
     Target star is in north Orion, 2 degrees west of 0 mag star Betelgeuse =
     alpha Orionis = SAO 113271. Just 2.6' west of target is 9.3 mag SAO 113131.

Close finding chart (prepared in GUIDE7):
 * 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





Data for the minor planet:
 * general information:
     number, name: (712) Boliviana
     approx. diameter [km]: 132
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone),
                                TMO (Bill Owen)
     number of used observations: 85 USNO, 12 TMO
     number of rejected observations: 7 USNO, 5 TMO
     time covered by the observations: 1998 02 02 - 2001 12 25
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.08", 0.07"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 01:02.7 UT
 * approx. V mag of minor planet at event [mag]: 11.3
 * geocentric parallax of minor planet ["]: 7.007
 * magnitude drop [mag]: 1.7
 * estimated maximum duration [s]: 17.9
 * apparent motion of minor planet ["/h]: 29.14
 * angular distance to moon, phase of moon [deg,%]: 121, 40%
 * remarks:

Calculator(s): Jan Manek








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