Update for (1030) Vitja - June 4/5, 2002

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
            (1030) Vitja / TYC 5177-00662-1 on June 4/5, 2002
     visible from Africa, Italy, E Switzerland, W Austria, SW Germany,
                            and Netherlands


Summary 

In morning of the night of June 4/5, 2002 a faint 11.8 mag star TYC 5177-00662-1 will be occulted by a 66 km asteroid (1030) Vitja. This update is based on USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.

The updated path shows ~3 path width west shift with time ~3.1 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over Italy from south ~1:34 UT to north ~1:36.5 UT, east Switzerland and west Austria ~1:36.9 UT, southwest Germany ~1:37.5 UT and Netherlands ~1:38.0 UT. Well within expected errors is also northeast France and Belgium. 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 5, 2002 @ 01:37 UT
 * magnitude of target star: 11.8
 * magnitude drop [mag]: 3.9
 * estimated maximum duration [s]: 13.7
 * path description: given above
 * Goffin's original chart reference: A02_0641

The occultation path:
 * approximate ground width [km]: 70
 * uncertainty [path widths]: 2.5
 * uncertainty in time [s]: 35
 * 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 5177-00662-1
 * constellation: Aquarius
 * J2000 position [h,m,s; o,',"]: 20h 39m 10.4866s; -00o 00' 12.843"
 * position source: UCAC combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.01" (0.005", 0.005")
 * V mag [mag]: 11.83
 * B-V [mag]: +0.87
 * remarks:
    Recent UCAC position was provided by Marion and Norbert Zacharias.
    Target star is in very nortwest Aquarius, close to border with Aquila, about 7 degrees east of
    3.2 mag star theta Aquilae = SAO 144150. Target star is 30' south of 5.1 mag star SAO 126062 = 1 Aquarii.
    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 13.0
 * labeled stars have indicated SAO numbers
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (1030) Vitja
     approx. diameter [km]: 66
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 74 USNO
     number of rejected observations: 20 USNO
     time covered by the observations: 1998 09 13 - 2001 06 17
     rms residuals ["] (RA,DE): 0.08", 0.08"
     estimated positional accuracy at epoch of event ["]: 0.08", 0.08"
     remarks: No recent oposition astrometry. Accuracy may be lower than expected.

Data for the event:
 * UT date and time of least geocentric approach: 01:19.8 UT
 * approx. V mag of minor planet at event [mag]: 15.7
 * geocentric parallax of minor planet ["]: 3.511
 * magnitude drop [mag]: 3.9
 * estimated maximum duration [s]: 13.7
 * apparent motion of minor planet ["/h]: 9.57
 * angular distance to moon, phase of moon [deg,%]: 58, 31%
 * 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  '  "
     21  0  0    29 29  5    1 31 19    58   -23   30 13  9   28 45  5
     20  0  0    31 25 14    1 31 59    56   -22   32  8 42   30 41 51
     19  0  0    33 17  7    1 32 37    54   -21   33 59 56   32 34 22
     18  0  0    35  4 41    1 33 12    52   -20   35 46 51   34 22 37
     17  0  0    36 47 58    1 33 46    50   -19   37 29 26   36  6 34
     16  0  0    38 26 59    1 34 17    49   -19   39  7 46   37 46 16
     15  0  0    40  1 47    1 34 46    47   -18   40 41 51   39 21 47
     14  0  0    41 32 27    1 35 14    45   -17   42 11 49   40 53  9
     13  0  0    42 59  6    1 35 39    44   -16   43 37 44   42 20 30
     12  0  0    44 21 48    1 36  3    42   -15   44 59 44   43 43 56
     11  0  0    45 40 43    1 36 25    41   -15   46 17 55   45  3 33
     10  0  0    46 55 57    1 36 46    39   -14   47 32 27   46 19 30
      9  0  0    48  7 40    1 37  6    38   -13   48 43 27   47 31 55
      8  0  0    49 15 59    1 37 24    37   -13   49 51  5   48 40 55
      7  0  0    50 21  3    1 37 40    35   -12   50 55 28   49 46 40
      6  0  0    51 23  1    1 37 56    34   -11   51 56 46   50 49 17
      5  0  0    52 22  1    1 38 11    33   -11   52 55  7   51 48 57
      4  0  0    53 18 12    1 38 24    32   -10   53 50 40   52 45 46
      3  0  0    54 11 42    1 38 37    31   -10   54 43 33   53 39 53
      2  0  0    55  2 39    1 38 49    30    -9   55 33 53   54 31 26
      1  0  0    55 51 11    1 38 60    29    -9   56 21 50   55 20 33
      0  0  0    56 37 25    1 39 10    28    -8   57  7 30   56  7 20
   -  1  0  0    57 21 28    1 39 20    27    -8   57 50 60   56 51 56
   -  2  0  0    58  3 26    1 39 29    26    -7   58 32 26   57 34 27
   -  3  0  0    58 43 27    1 39 37    25    -7   59 11 57   58 14 58
   -  4  0  0    59 21 36    1 39 45    25    -6   59 49 36   58 53 37
   -  5  0  0    59 57 60    1 39 52    24    -6   60 25 31   59 30 29
   -  6  0  0    60 32 43    1 39 59    23    -6   60 59 46   60  5 40
   -  7  0  0    61  5 50    1 40  6    22    -5   61 32 27   60 39 14
   -  8  0  0    61 37 27    1 40 12    22    -5   62  3 38   61 11 17
   ........................... 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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