Update for (1467) Mashona - November 28, 2001

Jan Manek's update

                      IOTA/IOTA-ES occultation update for
            (1467) Mashona / TYC 2261-00506-1 on November 28, 2001
         visible from Finland, SE Sweden, NW Poland, NE & SE Germany,
              W Czechia, W Austria, E Switzerland and NW Italy.


Summary 

In the evening of November 28, 2001 a 10.1 mag star TYC 2261-00506-1 will be occulted by a 112 km asteroid (1467) Mashona. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Tycho-2 star position.

The updated path shows ~0.5" west shift with time ~0.8 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over Finland from NE ~20:26 UT to SW with Turku on east limit ~20:28.3 UT. Western limit grazes coast of Sweden with Stockhokm just out at ~20:28.7 UT. After crossing Baltic sea path runs over land again ~20:30 UT- over NW tip of Poland with Sczecin and NE part of Germany with Berlin in path ~20:30.5 UT and SE Germany with Munich on east limit at ~20:31.6 UT. At 20:31 UT path runs also over western Czechia with Pilsen just out of path ~20:31.1 UT. Around 20:32 UT Austria west of Innsbruck, Lichtenstein and SE Switzerland are in path. Around 20:32.5 UT NW Italy is in path with Milano on centerline. Thenafter path grazes Corse and runs towards Africa. Within path uncertainties are also places, please check the path chart for details.

Large brightness drop with star high in the sky and long event duration makes this a very promising event - please give a try. Plese also try to contact observers in the path (uncertainty) areas and inform them about this promising event.

I wish all observers clear skies !!!

The event at one glimpse:
  * date and approx. UT time of event: November 9, 2001 @ 18:31 UT (central Europe)
  * magnitude of target star: 10.1
  * magnitude drop [mag]: 3.8
  * estimated maximum duration [s]: 16.9
  * path description: given above
  * Goffin's original chart reference: A01_1146

The occultation path:
  * approximate ground width [km]: 115
 * uncertainty [path widths]: 2.0
 * uncertainty in time [s]: 35
* 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 2261-00506-1
 * constellation: Andromeda
 * J2000 position [h,m,s; o,',"]: 00h 20m 18.315s; +30o 40' 38.41"
 * position source: Tycho-2
 * estimated accuracy ["]: 0.04" (0.03", 0.03")
 * V mag [mag]: 10.11
 * B-V [mag]: +0.23
 * remarks:
     Target star is in SW Andromeda, about 3 degree NE of 2.1 mag star alpha
     Andromedae = SAO 73765. Target star is 16' south of 5.9 mag star SAO 53820.

Close finding chart (prepared in GUIDE7):
 * occulted star is in center - labeled with cross
 * field is 3.0x3.0 degrees
 * limiting magnitude is 12.5
 * labeled stars have indicated SAO numbers





Data for the minor planet:
 * general information:
     number, name: (1467) Mashona
     approx. diameter [km]: 112
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 102 USNO, 11 TMO
     number of rejected observations: 14 USNO, 3 TMO
     time covered by the observations: 1998 04 21 - 2001 11 13
     rms residuals ["] (RA,DE): 0.09", 0.10"
     estimated positional accuracy at epoch of event ["]: 0.09", 0.10"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 20:36.9 UT
 * approx. V mag of minor planet at event [mag]: 13.9
 * geocentric parallax of minor planet ["]: 3.468
 * magnitude drop [mag]: 3.8
 * estimated maximum duration [s]: 16.9
 * apparent motion of minor planet ["/h]: 13.00
 * angular distance to moon, phase of moon [deg,%]: 38, 95%
 * 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  '  "
     36  0  0    68 40 46   20 26  5    44   -42   69 23 46   67 57 38
     35  0  0    68 18 58   20 26 12    44   -42   69  2 42   67 35  5
     34  0  0    67 56  1   20 26 18    45   -42   68 40 32   67 11 21
     33  0  0    67 31 52   20 26 25    46   -43   68 17 12   66 46 22
     32  0  0    67  6 24   20 26 32    46   -43   67 52 37   66 20  2
     31  0  0    66 39 34   20 26 39    47   -43   67 26 42   65 52 16
     30  0  0    66 11 15   20 26 47    47   -43   66 59 21   65 22 59
     29  0  0    65 41 21   20 26 55    48   -44   66 30 28   64 52  3
     28  0  0    65  9 45   20 27  3    48   -44   65 59 58   64 19 22
     27  0  0    64 36 20   20 27 12    49   -44   65 27 41   63 44 47
     26  0  0    64  0 58   20 27 22    50   -44   64 53 31   63  8 11
     25  0  0    63 23 28   20 27 32    51   -45   64 17 19   62 29 23
     24  0  0    62 43 41   20 27 42    51   -45   63 38 54   61 48 14
     23  0  0    62  1 26   20 27 54    52   -45   62 58  7   61  4 31
     22  0  0    61 16 31   20 28  6    53   -46   62 14 44   60 18  1
     21  0  0    60 28 40   20 28 18    54   -46   61 28 32   59 28 31
     20  0  0    59 37 40   20 28 32    55   -46   60 39 17   58 35 43
     19  0  0    58 43 11   20 28 47    56   -47   59 46 42   57 39 20
     18  0  0    57 44 56   20 29  2    57   -47   58 50 28   56 39  1
     17  0  0    56 42 31   20 29 19    58   -47   57 50 13   55 34 24
     16  0  0    55 35 32   20 29 37    59   -48   56 45 34   54 25  2
     15  0  0    54 23 31   20 29 56    60   -48   55 36  4   53 10 28
     14  0  0    53  5 56   20 30 18    61   -48   54 21 12   51 50  6
     13  0  0    51 42 10   20 30 40    63   -49   53  0 24   50 23 19
     12  0  0    50 11 32   20 31  5    64   -49   51 32 59   48 49 23
     11  0  0    48 33 14   20 31 32    66   -49   49 58 12   47  7 28
     10  0  0    46 46 20   20 32  2    67   -50   48 15 10   45 16 34
      9 35 31    46  0  0   20 32 15    68   -50    8 48 24   10 22 53
      9  5  4    45  0  0   20 32 32    69   -50    8 18 55    9 51 28
      8 35 56    44  0  0   20 32 48    70   -50    7 50 41    9 21 25
      8  8  2    43  0  0   20 33  5    70   -50    7 23 38    8 52 39
      7 41 17    42  0  0   20 33 22    71   -50    6 57 41    8 25  6
      7 15 37    41  0  0   20 33 39    72   -50    6 32 47    7 58 40
      6 50 58    40  0  0   20 33 56    72   -50    6  8 50    7 33 17
      6 27 16    39  0  0   20 34 13    73   -50    5 45 49    7  8 53
      6  4 27    38  0  0   20 34 30    74   -50    5 23 38    6 45 26
      5 42 29    37  0  0   20 34 47    74   -50    5  2 17    6 22 52
      5 21 19    36  0  0   20 35  4    75   -50    4 41 42    6  1  7
      5  0 55    35  0  0   20 35 21    75   -50    4 21 50    5 40  9
      4 41 13    34  0  0   20 35 38    76   -50    4  2 39    5 19 57
      4 22 13    33  0  0   20 35 55    76   -50    3 44  8    5  0 26
      4  3 51    32  0  0   20 36 12    76   -50    3 26 14    4 41 36
   ........................... 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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