Update for (680) Genoveva - January 11/12, 2002

Jan Manek's update

                       IOTA/IOTA-ES occultation update for
          (680) Genoveva / TYC 2934-01553-1 on January 11/12, 2002
        visible from Egypt, S Italy, Sarde, France, S England, S Ireland
                          plus Canada and very NW USA

Summary 

In the night of January 11/12, 2002 a faint 11.3 mag star TYC 2934-01553-1 will be occulted by a 87 km asteroid (680) Genoveva. This update is based on USNO/Flagstaff astrometry for the asteroid and Tycho-2 star position.

The updated path shows ~5 path widths south shift with time ~0.8 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs over Egypt ~2:56.5 UT, south Italy (Sicily and Calabria) around 2:57.5 UT, Sarde 2:58 UT, France from SE to NW around 2:58.5 UT, south England ~2:59 UT and south Ireland 2:59.3 UT. Later path runs over south Greenland ~3:01.5 UT and enters Canada - north Manitoba ~3:4.5 UT, central Saskatchewan ~3:05 UT, south Alberta ~3:05.5 UT, very SE British Columbia ~3:06 UT and finally state Washington in USA ~3:06.3 UT. Please check the path chart for details. Please check the path chart for details.

Faint star occultation with rather large uncertainties, not worth of distant travels.

The event at one glimpse:
 * date and approx. UT time of event: January 12, 2002 @ 02:58 UT (Euro)
                                                         03:06 UT (North Am.)
 * magnitude of target star: 11.3
 * magnitude drop [mag]: 4.0
 * estimated maximum duration [s]: 5.3
 * path description: given above
 * Goffin's original chart reference: A02_0144

The occultation path:
 * approximate ground width [km]: 95
 * uncertainty [path widths]: 4.8
 * uncertainty in time [s]: 25
 * map: below
 * remarks: Path uncertainities are given according to nominal star
    position errors and expected asteroid positional accuracy.

Data for the target star:
 * approximate ground width [km]: 95
 * uncertainty [path widths]: 4.8
 * uncertainty in time [s]: 25

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: (680) Genoveva
     approx. diameter [km]: 87
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 100 USNO
     number of rejected observations: 16 USNO
     time covered by the observations: 1998 03 12 - 2001 12 25
     rms residuals ["] (RA,DE): 0.11", 0.12"
     estimated positional accuracy at epoch of event ["]: 0.11", 0.12"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 03:02.6 UT
 * approx. V mag of minor planet at event [mag]: 15.3
 * geocentric parallax of minor planet ["]: 2.786
 * magnitude drop [mag]: 4.0
 * estimated maximum duration [s]: 5.3
 * apparent motion of minor planet ["/h]: 25.66
 * angular distance to moon, phase of moon [deg,%]: 161, 2%
 * remarks:

Calculator(s): Jan Manek








Centerline path and limit line 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    20  9  5    2 56 30     8   -18   20 44 16   19 34  3
     34  0  0    22  3 17    2 56 33    10   -20   22 38 32   21 28 11
     32  0  0    23 56 14    2 56 37    13   -22   24 31 31   23 21  8
     30  0  0    25 47 35    2 56 41    15   -25   26 22 50   25 12 29
     28  0  0    27 36 57    2 56 46    18   -27   28 12  8   27  1 55
     26  0  0    29 24  2    2 56 52    20   -29   29 59  7   28 49  6
     24  0  0    31  8 33    2 56 59    23   -31   31 43 30   30 33 46
     22  0  0    32 50 16    2 57  6    25   -33   33 25  2   32 15 39
     20  0  0    34 28 57    2 57 13    27   -34   35  3 31   33 54 32
     18  0  0    36  4 26    2 57 21    30   -36   36 38 45   35 30 16
     16  0  0    37 36 36    2 57 29    32   -38   38 10 39   37  2 42
     14  0  0    39  5 20    2 57 37    34   -39   39 39  5   38 31 43
     12  0  0    40 30 34    2 57 46    36   -41   41  4  1   39 57 16
     10  0  0    41 52 17    2 57 54    38   -42   42 25 23   41 19 19
      8  0  0    43 10 27    2 58  3    40   -43   43 43 12   42 37 50
      6  0  0    44 25  6    2 58 12    41   -44   44 57 29   43 52 50
      4  0  0    45 36 15    2 58 21    43   -45   46  8 17   45  4 21
      2  0  0    46 43 59    2 58 30    45   -46   47 15 38   46 12 27
      0  0  0    47 48 21    2 58 39    46   -47   48 19 37   47 17 12
   -  2  0  0    48 49 26    2 58 47    48   -48   49 20 19   48 18 39
   -  4  0  0    49 47 19    2 58 56    50   -49   50 17 50   49 16 54
   -  6  0  0    50 42  6    2 59  5    51   -49   51 12 14   50 12  3
   -  8  0  0    51 33 53    2 59 13    52   -50   52  3 39   51  4 12
   - 10  0  0    52 22 46    2 59 22    54   -50   52 52 11   51 53 27
   - 12  0  0    53  8 51    2 59 30    55   -51   53 37 55   52 39 53
   - 14  0  0    53 52 15    2 59 38    56   -51   54 20 58   53 23 37
   - 16  0  0    54 33  3    2 59 46    57   -51   55  1 27   54  4 45
   - 18  0  0    55 11 22    2 59 54    58   -52   55 39 26   54 43 22
   - 20  0  0    55 47 16    3  0  2    59   -52   56 15  3   55 19 35
   ........................... shortened .............................
   - 90  0  0    58 33 17    3  4  1    67   -41   58 59 33   58  7  5
   - 92  0  0    58  9 39    3  4  9    67   -40   58 36  8   57 43 13
   - 94  0  0    57 44  5    3  4 16    66   -39   58 10 49   57 17 26
   - 96  0  0    57 16 32    3  4 24    65   -38   57 43 31   56 49 38
   - 98  0  0    56 46 56    3  4 32    64   -37   57 14 11   56 19 45
   -100  0  0    56 15 10    3  4 39    64   -37   56 42 42   55 47 43
   -102  0  0    55 41 11    3  4 47    63   -36   56  9  1   55 13 26
   -104  0  0    55  4 53    3  4 55    62   -35   55 33  1   54 36 50
   -106  0  0    54 26 10    3  5  4    61   -34   54 54 37   53 57 48
   -108  0  0    53 44 57    3  5 12    60   -33   54 13 44   53 16 16
   -110  0  0    53  1  8    3  5 21    58   -32   53 30 16   52 32  6
   -112  0  0    52 14 37    3  5 29    57   -30   52 44  5   51 45 14
   -114  0  0    51 25 17    3  5 38    56   -29   51 55  7   50 55 33
   -116  0  0    50 33  3    3  5 47    55   -28   51  3 15   50  2 57
   -118  0  0    49 37 48    3  5 56    53   -27   50  8 22   49  7 20
   -120  0  0    48 39 27    3  6  5    52   -25   49 10 24   48  8 37
   -122  0  0    47 37 54    3  6 15    50   -24   48  9 14   47  6 41
   -124  0  0    46 33  4    3  6 24    49   -23   47  4 46   46  1 29
   -126  0  0    45 24 52    3  6 34    47   -21   45 56 57   44 52 55
   -128  0  0    44 13 15    3  6 43    45   -19   44 45 41   43 40 56
   -130  0  0    42 58  9    3  6 53    44   -18   43 30 57   42 25 29
   -132  0  0    41 39 32    3  7  2    42   -16   42 12 41   41  6 32
   ........................... 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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