Update for (1467) Mashona - November 9, 2001

Jan Manek's update

                      IOTA/IOTA-ES occultation update for
            (1467) Mashona / TYC 2265-00675-1 on November 9, 2001
                visible from Russia, Belarus, Ukraina, Romania,
                  frm. Yugoslavia, south Italy and Sicilia.

Summary 

In the night of November 9, 2001 a 10.1 mag star TYC 2265-00675-1 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 ~0.7 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs over Russia, just north of Moscow ~18:12.4 UT, SE Belarus ~18:13.4 UT, east Ukraine ~18:14 UT, western Romania ~18:14.7 UT, frm. Yugoslavia with Beograd ~18:15.5 UT, south Italy ~18:16 UT, Sicilia ~18:16.7 UT. Within path uncertainties is also SE Poland, very east Slovakia, NW Moldavia and NW Bulgaria. Please check the path chart for details.

The event at one glimpse:
 * date and approx. UT time of event: November 9, 2001 @ 18:12 UT (Russia)
                                                         18:16 UT (Italy)
 * magnitude of target star: 10.1
 * magnitude drop [mag]: 3.5
 * estimated maximum duration [s]: 11.1
 * path description: given above
 * Goffin's original chart reference: A01_1145

The occultation path:
 * approximate ground width [km]: 120
 * uncertainty [path widths]: 2.0
 * uncertainty in time [s]: 20
 * 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 2265-00675-1
 * constellation: Andromeda
 * J2000 position [h,m,s; o,',"]: 00h 25m 18.652s; +32o 27' 56.53"
 * position source: Tycho-2
 * estimated accuracy ["]: 0.05" (0.03", 0.04")
 * V mag [mag]: 10.14
 * B-V [mag]: +0.21
 * remarks:
     Target star is in SW Andromeda, about 5 degree NE of 2.1 mag star alpha
     Andromedae = SAO 73765. Target star is 2.3' south of 9.4 mag star SAO 53878.

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: 95 USNO, 11 TMO
     number of rejected observations: 14 USNO, 3 TMO
     time covered by the observations: 1998 04 21 - 2001 11 01
     rms residuals ["] (RA,DE): 0.09", 0.11"
     estimated positional accuracy at epoch of event ["]: 0.09", 0.11"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 18:14.6 UT
 * approx. V mag of minor planet at event [mag]: 13.6
 * geocentric parallax of minor planet ["]: 3.736
 * magnitude drop [mag]: 3.5
 * estimated maximum duration [s]: 11.4
 * apparent motion of minor planet ["/h]: 21.36
 * angular distance to moon, phase of moon [deg,%]: 126, 36%
 * 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  '  "
     50  0  0    63 37  1   18 10 43    59   -38   64 20 14   62 54  6
     48  0  0    62 48 27   18 10 55    59   -38   63 32 32   62  4 42
     46  0  0    61 56 19   18 11  8    60   -38   62 41 16   61 11 42
     44  0  0    61  0 22   18 11 21    61   -38   61 46 14   60 14 53
     42  0  0    60  0 23   18 11 36    62   -38   60 47  9   59 13 59
     40  0  0    58 56  5   18 11 51    63   -38   59 43 47   58  8 48
     38  0  0    57 47 16   18 12  7    64   -37   58 35 54   56 59  5
     36  0  0    56 33 41   18 12 25    65   -37   57 23 14   55 44 35
     34  0  0    55 15  5   18 12 43    66   -37   56  5 33   54 25  7
     32  0  0    53 51 17   18 13  2    67   -36   54 42 37   53  0 28
     30  0  0    52 22  6   18 13 22    68   -36   53 14 17   51 30 27
     28  0  0    50 47 22   18 13 44    68   -35   51 40 20   49 54 58
     26  0  0    49  7  0   18 14  7    69   -35   50  0 42   48 13 53
     24  0  0    47 20 57   18 14 31    69   -34   48 15 18   46 27 12
     22  0  0    45 29 15   18 14 56    69   -33   46 24  9   44 34 57
     20  0  0    43 31 58   18 15 22    68   -32   44 27 21   42 37 13
     18  0  0    41 29 18   18 15 49    68   -30   42 25  2   40 34 12
     16  0  0    39 21 31   18 16 17    67   -29   40 17 30   38 26 10
     14  0  0    37  8 57   18 16 45    66   -28   38  5  3   36 13 28
     12  0  0    34 52  2   18 17 14    64   -26   35 48  9   33 56 32
     10  0  0    32 31 17   18 17 44    62   -24   33 27 18   31 35 53
      8  0  0    30  7 16   18 18 14    60   -22   31  3  4   29 12  5
      6  0  0    27 40 38   18 18 43    58   -21   28 36  6   26 45 45
      4  0  0    25 12  2   18 19 13    56   -18   26  7  5   24 17 34
      2  0  0    22 42 12   18 19 42    53   -16   23 36 44   21 48 13
      0  0  0    20 11 50   18 20 10    50   -14   21  5 46   19 18 25
   -  2  0  0    17 41 38   18 20 37    48   -12   18 34 54   16 48 51
   -  4  0  0    15 12 17   18 21  3    45    -9   16  4 50   14 20 12
   -  6  0  0    12 44 27   18 21 28    42    -7   13 36 14   11 53  7
   ........................... 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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