Update for (441) Bathilde - July 5/6, 2000

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
   (441) Bathilde / TYC 5735-02403-1 = SAO 162807 event on July 5/6, 2000
                    visible from Iceland in white-night


Summary 

In the night of July 5/6, 2000 a 9.6 mag star TYC 5735-02403-1 = SAO 162807 will be occulted by a 73 km asteroid (441) Bathilde. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and Tycho-2 star position.

The updated path shows ~1 path width north shift with time ~0.9 minutes later compared to Edwin Goffin's nominal prediction.

The path of this occultation runs over Iceland in white-night around 2:07 UT. Within errors is also the extreme north of Scotland ~2:06 UT.

The event at one glimpse:
 * date and approx. UT time of event: July 6, 2000 @ 02:07 UT
 * magnitude of target star: 9.6
 * magnitude drop [mag]: 3.3
 * estimated maximum duration [s]: 5.7
 * path description: given above
 * Goffin's original chart reference: A00_0724

The occultation path:
 * approximate ground width [km]: 330
 * uncertainty [path widths]: 2.4
 * uncertainty in time [s]: 15
 * map: below
 * remarks: Path uncertainities are given according to nominal star
    position errors and expected asteroid positional accuracy.
    !!!!!!!
    Circles along path indicates the centerline for this event.
    They are more accurate than the path limit lines.
    !!!!!!!

Data for the target star:
 * name: SAO 162807 = PPM 236227 = TYC 5735-02403-1
 * constellation: Sagittarius
 * J2000 position [h,m,s; o,',"]: 19h 36m 08.592s; -14o 13' 44.82"
 * position source: Tycho-2
 * estimated accuracy ["]: 0.04 (0.03", 0.03")
 * V mag [mag]: 9.58
 * B-V [mag]: +1.31
 * remarks: 
     Target star is in NE Sagittarius, about 4 degrees NE of 4.6 mag star
     upsilon Sagittarii or only 21' NNW of 5.5 mag star SAO 162827.

Close finding chart (prepared in GUIDE7):
 * occulted star is in center - labeled with cross
 * field is 2.0x2.0 degrees
 * limiting magnitude is 12.5
 * labeled stars have indicated SAO numbers





Data for the minor planet:
 * general information:
     number, name: (441) Bathilde
     approx. diameter [km]: 73
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 34 USNO, 3 TMO
     number of rejected observations: 3 USNO
     time covered by the observations: 1998 02 12 - 2000 06 27
     rms residuals ["] (RA,DE): 0.09", 0.09"
     estimated positional accuracy at epoch of event ["]: 0.09"
     remarks: 

Data for the event:
 * UT date and time of least geocentric approach: 02:07.0  UT
 * approx. V mag of minor planet at event [mag]: 12.8
 * geocentric parallax of minor planet ["]: 4.345
 * magnitude drop [mag]: 3.3
 * estimated maximum duration [s]: 5.7
 * apparent motion of minor planet ["/h]: 31.45
 * angular distance to moon, phase of moon [deg,%]: 130, 23%
 * remarks: 

Calculator(s): Jan Manek





Path coordinates:
                                       Altitude
  E. Longitude    Latitude     U.T.    star  sun
   ........ shortened ..........................
      o  '  "     o  '  "    h  m  s     o     o
   - 10  0  0    63 12 36    2  6 26    12    -3
   - 12  0  0    63  6 15    2  6 34    12    -3
   - 14  0  0    63  1 59    2  6 41    13    -3
   - 16  0  0    62 59 47    2  6 49    13    -4
   - 18  0  0    62 59 38    2  6 57    13    -4
   - 20  0  0    63  1 34    2  7  4    13    -4
   - 22  0  0    63  5 33    2  7 12    13    -4
   - 24  0  0    63 11 36    2  7 20    13    -4
   - 26  0  0    63 19 42    2  7 28    13    -4
   - 28  0  0    63 29 52    2  7 35    12    -4
   - 30  0  0    63 42  6    2  7 42    12    -4
   - 32  0  0    63 56 24    2  7 50    12    -4
   - 34  0  0    64 12 46    2  7 57    11    -3
   - 36  0  0    64 31 11    2  8  3    11    -3
   ........ shortened ..........................

----------------------------------------------------------------------------
Jan Manek
Stefanik Observatory                Private :
Petrin 205                          Werichova 950
118 46  Praha 1                     152 00  Praha 5 - Barrandov     |_|_|
Czech Republic                      Czech Republic                  /   \
Internet : jmanek@mbox.vol.cz                                      |-O-O-|
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