Update for (2357) Phereclos - November 12/13, 2003

Jan Manek's update

                  IOTA/IOTA-ES occultation update for
         (2357) Phereclos / TYC 1352-00961-1 on November 12/13, 2003
                        not visible from anywhere


Summary 

In the night of November 12/13, 2003 a faint 11.2 mag star TYC 1352-00961-1 will be occulted by a 103 km asteroid (2357) Phereclos. This update is based on TMO and Ondrejov astrometry for the asteroid and UCAC2 star position.

The updated path shows ~0.6" north shift with time ~11.7 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path due to north shift completely miss globe - it's almost a graze. No chance for anybody. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: November 12, 2003 @ 23:57 UT
 * magnitude of target star: 11.2
 * magnitude drop [mag]: 5.4
 * estimated maximum duration [s]: 17.2
 * path description: given above
 * Goffin's original chart reference: A03_1138

The occultation path:
 * approximate ground width [km]: ---
 * uncertainty [path widths]: 1.2
 * uncertainty in time [s]: 20
 * 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 1352-00961-1
 * constellation: Gemini
 * J2000 position [h,m,s; o,',"]: 06h 56m 12.0486s; +19o 46' 29.760"
 * position source: UCAC2
 * estimated accuracy ["]: 0.02" (0.02", 0.02")
 * V mag [mag]: 11.16
 * B-V [mag]: +0.49
 * remarks:
    Target star is in middle Gemini, about 2.3 degrees south of 0.0 mag planet Saturn.
    !!! IMPORTANT !!!
    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 GUIDE8):
 * 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
 * remarks: Second chart shows 30' blowup to show correctly the star in field.










Data for the minor planet:
 * general information:
     number, name: (2357) Phereclos
     approx. diameter [km]: 103
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: TMO (Bill Owen), Ondrejov (Kusnirak, Manek)
     number of used observations: 14 TMO, 3 Ondrejov
     number of rejected observations: 1 TMO
     time covered by the observations: 2003 09 20 - 2003 10 28
     rms residuals ["] (RA,DE): 0.05", 0.05"
     estimated positional accuracy at epoch of event ["]: 0.03", 0.03"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 22:56.9 UT
 * approx. V mag of minor planet at event [mag]: 16.6
 * geocentric parallax of minor planet ["]: 1.853
 * magnitude drop [mag]: 5.4
 * estimated maximum duration [s]: 17.2
 * apparent motion of minor planet ["/h]: 6.28
 * angular distance to moon, phase of moon [deg,%]: 13, 87%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Nov 12
 2357  Phereclos
22h 56.9m UT
  11.2    6 56 12.049 19 46 29.76TYC 1352-00961-1      11.7
16.6    103   17.2   4.745    -0.444     -0.55
   68.166  19.776   191.82  -17.78
 22.9483  -.08877  1.00567 -3.37307 -0.29836 -0.00484  0.00066
2000    204.273508200311 7.0000072.603067 179.3635042.668103  0.042863635.192585304.970012278.945   0.15
RATE  .8329690 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================

Calculator(s): Jan Manek








Path coordinates:
                  Centre              Star  Star   Sun      Path Limits           Error Limits
  E. Longitude   Latitude      U.T.    Alt    Az   Alt    Limit 1    Limit 2    Limit 3    Limit 4
    ...................................... shortened .............................................
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "
                                                         Latitude   Latitude   Latitude   Latitude
           no ground path
    ...................................... 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 AT worldonline.cz                             |-O-O-|
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