Update for (242) Kriemhild - January 17/18, 2002

Jan Manek's update

                       IOTA/IOTA-ES occultation update for
            (242) Kriemhild / TYC 0182-00175-1 on January 17/18, 2002
    visible from middle East, north Africa, S Spain and S Portugal in Europe,
                             plus NE Canada and USA


Summary 

In the night of January 17/18, 2002 a 9.9 mag star TYC 0182-00175-1 will be occulted by a 42 km asteroid (242) Kriemhild. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC star position.

The updated path shows ~2 path widths north shift with time ~0.3 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs over middle East and north Africa. Over south Spain path runs around 0:18.1 UT and south Portugal ~0:18.9 UT with Lisbon on north limit. Later path runs over NE Canada ~0:25 UT with Montreal and Ottawa ~0:25.3 UT and USA - Great lakes area ~0:25.9 UT; north Wisconsin and middle Minnesota. Please check the path chart for details.

The event at one glimpse:
 * date and approx. UT time of event: January 18, 2002 @ 00:18 UT (Euro)
                                                         00:25 UT (North Am.)
 * magnitude of target star: 9.9
 * magnitude drop [mag]: 2.9
 * estimated maximum duration [s]: 4.0
 * path description: given above
 * Goffin's original chart reference: A02_0123

The occultation path:
 * approximate ground width [km]: 50
 * uncertainty [path widths]: 2.7
 * uncertainty in time [s]: 10
 * 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 0182-00175-1
 * constellation: Canis Minor
 * J2000 position [h,m,s; o,',"]: 07h 36m 53.7741s; +02o 54' 04.565"
 * position source: weighted mean of Tycho-2 and UCAC + Tycho-2 proper motion
 * estimated accuracy ["]: 0.02" (0.015", 0.020")
 * V mag [mag]: 9.93
 * B-V [mag]: +0.94
 * remarks:
     Recent UCAC position was provided by Marion and Norbert Zacharias.
     Target star is in south Canis Minor, 2.4 degrees south of Procyon =
     alpha Canis Minoris = SAO 115756. Be careful to observe the correct star -
     only 1.3' south of target is a 10.2 mag companion TYC 0182-00063-1.

Close finding chart (prepared in GUIDE7):
 * occulted star is in center - labeled with cross
 * field is 2.0x2.0 degrees
 * limiting magnitude is 13.0
 * labeled stars have indicated SAO numbers





Data for the minor planet:
 * general information:
     number, name: (242) Kriemhild
     approx. diameter [km]: 42
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 82 USNO, 2 TMO
     number of rejected observations: 3 USNO
     time covered by the observations: 1998 02 12 - 2002 01 08
     rms residuals ["] (RA,DE): 0.12", 0.10"
     estimated positional accuracy at epoch of event ["]: 0.08", 0.08"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 00:17.6 UT
 * approx. V mag of minor planet at event [mag]: 12.7
 * geocentric parallax of minor planet ["]: 5.630
 * magnitude drop [mag]: 2.9
 * estimated maximum duration [s]: 4.0
 * apparent motion of minor planet ["/h]: 32.97
 * angular distance to moon, phase of moon [deg,%]: 124, 18%
 * 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  '  "
      2  0  0    36 14 17    0 17 18    56   -74   36 28 25   36  0 12
      0  0  0    36 36 16    0 17 35    56   -74   36 50 23   36 22 10
   -  2  0  0    36 58  2    0 17 52    56   -74   37 12  9   36 43 57
   -  4  0  0    37 19 34    0 18  9    55   -73   37 33 42   37  5 29
   -  6  0  0    37 40 51    0 18 26    55   -73   37 54 59   37 26 47
   -  8  0  0    38  1 52    0 18 43    55   -72   38 15 59   37 47 48
   - 10  0  0    38 22 35    0 18 59    55   -71   38 36 42   38  8 31
   - 12  0  0    38 42 59    0 19 16    54   -70   38 57  5   38 28 55
   - 14  0  0    39  3  2    0 19 32    54   -69   39 17  8   38 48 59
   ........................... shortened .............................
   - 56  0  0    44 17 22    0 24  8    32   -41   44 31 14   44  3 33
   - 58  0  0    44 26 13    0 24 17    30   -39   44 40  5   44 12 25
   - 60  0  0    44 34 27    0 24 26    29   -38   44 48 18   44 20 39
   - 62  0  0    44 42  4    0 24 35    28   -37   44 55 53   44 28 16
   - 64  0  0    44 49  2    0 24 43    26   -35   45  2 51   44 35 15
   - 66  0  0    44 55 22    0 24 51    25   -34   45  9 11   44 41 35
   - 68  0  0    45  1  4    0 24 59    24   -32   45 14 52   44 47 17
   - 70  0  0    45  6  6    0 25  6    22   -31   45 19 54   44 52 21
   - 72  0  0    45 10 30    0 25 12    21   -30   45 24 17   44 56 45
   - 74  0  0    45 14 15    0 25 19    20   -28   45 28  2   45  0 30
   - 76  0  0    45 17 20    0 25 25    18   -27   45 31  7   45  3 36
   - 78  0  0    45 19 46    0 25 30    17   -25   45 33 32   45  6  1
   - 80  0  0    45 21 31    0 25 35    16   -24   45 35 18   45  7 48
   - 82  0  0    45 22 37    0 25 40    14   -23   45 36 23   45  8 54
   - 84  0  0    45 23  3    0 25 44    13   -21   45 36 49   45  9 20
   - 86  0  0    45 22 49    0 25 48    11   -20   45 36 35   45  9  6
   - 88  0  0    45 21 55    0 25 51    10   -18   45 35 41   45  8 12
   - 90  0  0    45 20 20    0 25 54     9   -17   45 34  6   45  6 37
   - 92  0  0    45 18  5    0 25 57     7   -16   45 31 51   45  4 22
   - 94  0  0    45 15  9    0 25 59     6   -14   45 28 55   45  1 26
   - 96  0  0    45 11 33    0 26  1     5   -13   45 25 19   44 57 50
   ........................... shortened .............................

----------------------------------------------------------------------------
Jan Manek
Stefanik Observatory                Private :
Petrin 205                          Werichova 950
118 46  Praha 1                     152 00  Praha 5 - Barrandov     |_|_|
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Internet : jan.manek@worldonline.cz                                |-O-O-|
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