Update for (912) Maritima - January 21/22, 2002

Jan Manek's update

                       IOTA/IOTA-ES occultation update for
           (912) Maritima / TYC 5573-00706-1 on January 21/22, 2002
                 visible from S France, NE Spain and NE Tunis


Summary 

In the morning of night January 21/22, 2002 a faint 11.4 mag star TYC 5573-00706-1 will be occulted by a 87 km asteroid (912) Maritima. This update is based on USNO/Flagstaff, Geneva and Astdys historic astrometry for the asteroid and UCAC1 star position.

The updated path shows ~0.3" south shift with time ~0.2 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs over south France around 5:13.2 UT with Pic du Midi on south limit and Bordeaux on north limit and some seconds later over NE Spain with Barcelona on south limit. At 5:13.8 UT Tunis is in path. Larger area is covered taking uncertainty into consideration. Please check the path chart for details.

Good luck !

The event at one glimpse:
 * date and approx. UT time of event: January 22, 2002 @ 05:13 UT (Euro)
 * magnitude of target star: 11.4
 * magnitude drop [mag]: 2.8
 * estimated maximum duration [s]: 4.2
 * path description: given above
 * Goffin's original chart reference: A02_0150

The occultation path:
 * approximate ground width [km]: 110
 * uncertainty [path widths]: 3.0
 * 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: TYC 5573-00706-1
 * constellation: Libra
 * J2000 position [h,m,s; o,',"]: 14h 46m 38.1783s; -12o 22' 59.247"
 * position source: UCAC1
 * estimated accuracy ["]: 0.02" (0.016", 0.007")
 * V mag [mag]: 11.43
 * B-V [mag]: +0.32
 * remarks:
    Target star is in NW Libra, 3.8 degrees north of 2.8 mag star alpha2 Librae =
    = SAO 158840 or 34' north of 6.3 mag star SAO 158808.

Close finding chart (prepared in GUIDE7):
 * 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





Data for the minor planet:
 * general information:
     number, name: (912) Maritima
     approx. diameter [km]: 87
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), Geneva (Raoul Behrend), Neodys
     number of used observations: 83 USNO, 4(1) Geneva
     number of rejected observations: 2 USNO
     time covered by the observations: 1985 03 22 - 2001 04 03
     rms residuals ["] (RA,DE): 0.17", 0.17"
     estimated positional accuracy at epoch of event ["]: 0.11", 0.11"
     remarks: From 4 Geneva positions wes formed one mean position.

Data for the event:
 * UT date and time of least geocentric approach: 05:16.4 UT
 * approx. V mag of minor planet at event [mag]: 14.1
 * geocentric parallax of minor planet ["]: 2.949
 * magnitude drop [mag]: 2.8
 * estimated maximum duration [s]: 4.2
 * apparent motion of minor planet ["/h]: 34.85
 * angular distance to moon, phase of moon [deg,%]: 174, 55%
 * 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  '  "
   - 21  0  0    54 13 50    5 12 29    14   -36   53 38 10   54 49 49
   - 20  0  0    53 47 59    5 12 30    15   -36   53 12 12   54 24  7
   - 19  0  0    53 21 37    5 12 32    16   -36   52 45 42   53 57 52
   - 18  0  0    52 54 42    5 12 33    16   -35   52 18 40   53 31  4
   - 17  0  0    52 27 14    5 12 34    17   -35   51 51  5   53  3 44
   - 16  0  0    51 59 15    5 12 36    18   -34   51 22 59   52 35 52
   - 15  0  0    51 30 43    5 12 38    19   -34   50 54 21   52  7 27
   - 14  0  0    51  1 39    5 12 39    19   -33   50 25 11   51 38 30
   - 13  0  0    50 32  4    5 12 41    20   -33   49 55 29   51  9  0
   - 12  0  0    50  1 57    5 12 43    21   -32   49 25 17   50 38 59
   - 11  0  0    49 31 19    5 12 45    22   -31   48 54 33   50  8 27
   - 10  0  0    49  0 10    5 12 47    22   -31   48 23 20   49 37 23
   -  9  0  0    48 28 31    5 12 49    23   -30   47 51 36   49  5 49
   -  8  0  0    47 56 23    5 12 51    24   -30   47 19 23   48 33 44
   -  7  0  0    47 23 45    5 12 54    25   -29   46 46 41   48  1 10
   -  6  0  0    46 50 38    5 12 56    26   -28   46 13 31   47 28  7
   -  5  0  0    46 17  4    5 12 59    27   -27   45 39 54   46 54 36
   -  4  0  0    45 43  2    5 13  2    27   -27   45  5 49   46 20 37
   -  3  0  0    45  8 34    5 13  4    28   -26   44 31 19   45 46 12
   -  2  0  0    44 33 41    5 13  7    29   -25   43 56 24   45 11 20
   -  1  0  0    43 58 23    5 13 10    30   -25   43 21  5   44 36  4
      0  0  0    43 22 42    5 13 13    31   -24   42 45 23   44  0 24
      1  0  0    42 46 39    5 13 17    32   -23   42  9 19   43 24 21
      2  0  0    42 10 14    5 13 20    33   -22   41 32 55   42 47 56
      3  0  0    41 33 29    5 13 24    33   -21   40 56 10   42 11 11
      4  0  0    40 56 26    5 13 27    34   -20   40 19  8   41 34  6
      5  0  0    40 19  5    5 13 31    35   -20   39 41 48   40 56 44
      6  0  0    39 41 27    5 13 35    36   -19   39  4 13   40 19  5
      7  0  0    39  3 35    5 13 39    37   -18   38 26 23   39 41 11
      8  0  0    38 25 30    5 13 43    38   -17   37 48 20   39  3  2
      9  0  0    37 47 13    5 13 47    39   -16   37 10  6   38 24 42
     10  0  0    37  8 45    5 13 51    39   -15   36 31 42   37 46 11
     11  0  0    36 30  9    5 13 55    40   -14   35 53  9   37  7 30
     12  0  0    35 51 25    5 13 60    41   -13   35 14 30   36 28 42
     13  0  0    35 12 36    5 14  5    42   -12   34 35 45   35 49 48
     14  0  0    34 33 42    5 14  9    43   -11   33 56 57   35 10 49
     15  0  0    33 54 46    5 14 14    43   -10   33 18  6   34 31 48
     16  0  0    33 15 49    5 14 19    44    -9   32 39 15   33 52 45
     17  0  0    32 36 53    5 14 24    45    -8   32  0 25   33 13 42
     18  0  0    31 57 59    5 14 29    46    -7   31 21 37   32 34 42
     19  0  0    31 19  9    5 14 34    46    -6   30 42 54   31 55 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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