Update for (324) Bamberga - June 18, 2002

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
            (324) Bamberga / TYC 0256-00656-1 on June 18, 2002
                        visible from north Africa


Summary 

In evening of June 18, 2002 a faint 11.9 mag star TYC 0256-00656-1 will be occulted by a 228 km asteroid (324) Bamberga. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.

The updated path shows ~2 path width south shift with time ~0.6 minutes later compared to Edwin Goffin's nominal prediction. This shift is caused primarily by the new UCAC star position

Updated path runs over north Algeria in strong evening twilight ~19:34.2 UT, south Tunisia ~19:34.7 UT, Libya around ~19:35.2 UT, south Egypt ~19:35.8 UT. I suppose there is no observer in this new path. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: June 18, 2002 @ 19:35 UT
 * magnitude of target star: 11.9
 * magnitude drop [mag]: 1.7
 * estimated maximum duration [s]: 10.6
 * path description: given above
 * Goffin's original chart reference: A02_0623

The occultation path:
 * approximate ground width [km]: 320
 * uncertainty [path widths]: 0.66
 * uncertainty in time [s]: 8
 * 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 0256-00656-1
 * constellation: Sextant
 * J2000 position [h,m,s; o,',"]: 10h 37m 37.4392s; +03o 18' 35.523"
 * position source: UCAC combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.01" (0.013", 0.005")
 * V mag [mag]: 11.92
 * B-V [mag]: +0.84
 * remarks:
    Recent UCAC position was provided by Marion and Norbert Zacharias.
    Target star is in northeast Sextant, about 11 degrees southeast of 1.4 mag star Regulus in Leo.
    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 GUIDE7):
 * occulted star is in center - labeled with cross
 * field is 3.0x3.0 degrees
 * limiting magnitude is 13.5
 * labeled stars have indicated SAO numbers
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (324) Bamberga
     approx. diameter [km]: 228
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 162 USNO, 8 TMO
     number of rejected observations: 10 USNO
     time covered by the observations: 1998 01 29 - 2002 05 03
     rms residuals ["] (RA,DE): 0.08", 0.10"
     estimated positional accuracy at epoch of event ["]: 0.06", 0.05"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 19:32.6 UT
 * approx. V mag of minor planet at event [mag]: 13.3
 * geocentric parallax of minor planet ["]: 2.383
 * magnitude drop [mag]: 1.7
 * estimated maximum duration [s]: 10.6
 * apparent motion of minor planet ["/h]: 28.98
 * angular distance to moon, phase of moon [deg,%]: 30, 59%
 * remarks:

Calculator(s): Jan Manek





Path coordinates:
                                                   Latitude   Latitude
                  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  '  "
   -  2  0  0    35 33  8   19 33 56    42    -2   33 57 15   37 12  0
      0  0  0    34 42  7   19 34  5    41    -4   33  6 46   36 20 25
      2  0  0    33 52  4   19 34 14    40    -6   32 17 15   35 29 47
      4  0  0    33  3  4   19 34 22    39    -8   31 28 48   34 40 11
      6  0  0    32 15 14   19 34 31    37   -10   30 41 31   33 51 45
      8  0  0    31 28 40   19 34 39    36   -12   29 55 29   33  4 35
     10  0  0    30 43 25   19 34 47    35   -13   29 10 48   32 18 45
     12  0  0    29 59 37   19 34 54    33   -15   28 27 31   31 34 21
     14  0  0    29 17 18   19 35  2    32   -17   27 45 45   30 51 27
     16  0  0    28 36 34   19 35  9    30   -19   27  5 32   30 10  9
     18  0  0    27 57 28   19 35 15    29   -21   26 26 57   29 30 30
     20  0  0    27 20  4   19 35 22    27   -22   25 50  3   28 52 34
     22  0  0    26 44 25   19 35 28    25   -24   25 14 53   28 16 24
     24  0  0    26 10 35   19 35 33    24   -26   24 41 30   27 42  4
     26  0  0    25 38 35   19 35 39    22   -27   24  9 56   27  9 35
     28  0  0    25  8 28   19 35 44    20   -29   23 40 15   26 39  1
     30  0  0    24 40 17   19 35 48    18   -30   23 12 27   26 10 24
     32  0  0    24 14  3   19 35 52    16   -32   22 46 36   25 43 46
     34  0  0    23 49 48   19 35 56    15   -33   22 22 41   25 19  8
     36  0  0    23 27 33   19 35 59    13   -35   22  0 45   24 56 32
     38  0  0    23  7 19   19 36  2    11   -36   21 40 49   24 35 59
     40  0  0    22 49  7   19 36  4     9   -37   21 22 54   24 17 30
     42  0  0    22 32 59   19 36  6     7   -38   21  7  1   24  1  7
     44  0  0    22 18 55   19 36  8     5   -40   20 53  9   23 46 48
   ........................... 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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