Update for (528) Rezia - March 8/9, 2003

Jan Manek's update

                  IOTA/IOTA-ES occultation update for
             (528) Rezia / TYC 2448-00236-1 on March 8/9, 2003
      visible from Scotland, England, W France, E Spain and Algeria

Summary 

In the night of March 8/9, 2003 a faint 11.4 mag star TYC 2448-00236-1 will be occulted by a 86 km asteroid (528) Rezia. This update is based on USNO/Flagstaff astrometry for the asteroid and recent UCAC star position.

The updated path shows ~10 path width west shift with time 6.6 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over Scotland ~21:51 UT, England ~21:53 UT with Birmingham of east limit, W France 21:54-21:56 UT with Nantes and Bordeaux on west limit, E Spain ~21:56.4 UT just west of Barcelona and Algeria ~21:58.5 UT. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: March 8, 2003 @ 21:55 UT (Europe)
 * magnitude of target star: 11.4
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 16.4
 * path description: given above
 * Goffin's original chart reference: A03_0338

The occultation path:
 * approximate ground width [km]: 100
 * uncertainty [path widths]: 1.5
 * uncertainty in time [s]: 25
 * 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 2448-00236-1
 * constellation: Auriga
 * J2000 position [h,m,s; o,',"]: 06h 51m 51.4007s; +36o 36' 29.100"
 * position source: recent UCAC position combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.02" (0.01", 0.01")
 * V mag [mag]: 11.44
 * B-V [mag]: +1.19
 * remarks:
    Target star is in east Auriga, about 3.6 degrees nort of 3.6 mag star theta Geminorum = SAO 59570.
    !!! 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 the field.








Data for the minor planet:
 * general information:
     number, name: (528) Rezia
     approx. diameter [km]: 86
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 107 USNO
     number of rejected observations: 21 USNO
     time covered by the observations: 1998 03 03 - 2003 02 05
     rms residuals ["] (RA,DE): 0.08", 0.10"
     estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 21:54.5 UT
 * approx. V mag of minor planet at event [mag]: 15.0
 * geocentric parallax of minor planet ["]: 3.012
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 16.4
 * apparent motion of minor planet ["/h]: 8.92
 * angular distance to moon, phase of moon [deg,%]: 51, 28%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Mar 08
528 Rezia
21h 54.5m UT
48-00236-1  11.4    6 51 51.401 36 36 29.10TYC 2448-00236-1
15.0     86   16.4   2.920     0.417     -7.39
  -31.841  36.610   214.09   -4.78
 21.9077   .35215   .23865  1.66423 -2.45300  0.00545 -0.00105
2000    109.6375852003 3 2.00000314.62581350.116014 12.650029 0.014859823.401587073.351040109.145   0.15
RATE 1.5710200 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================

Calculator(s): Jan Manek






Path coordinates:
                  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  '  "
                                                   Latitude   Latitude
   -  8  0  0    72  8  1   21 45 51    53   -17   69 10 53   75 29 36
   -  7  0  0    69 42 47   21 46 38    55   -19   66 41 46   73  9 54
   -  6  0  0    66 55 57   21 47 32    57   -22   63 53 36   70 24 54
   -  5  0  0    63 47 49   21 48 35    59   -24   60 46 59   67 14 30
   -  4  0  0    60 20 17   21 49 47    61   -27   57 23 44   63 40 51
   -  3  0  0    56 36 44   21 51  5    62   -30   53 46 50   59 48  4
   -  2  0  0    52 41 38   21 52 29    64   -34   50  0 10   55 41 40
   -  1  0  0    48 39 54   21 53 56    64   -37   46  7 56   51 27 33
      0  0  0    44 36 20   21 55 24    64   -40   42 14 20   47 11 23
      1  0  0    40 35  4   21 56 51    64   -44   38 22 58   42 57 57
      2  0  0    36 39 25   21 58 16    62   -47   34 36 48   38 50 54
      3  0  0    32 51 43   21 59 37    60   -51   30 57 56   34 52 48
      4  0  0    29 13 29   22  0 53    58   -54   27 27 47   31  5 12
      5  0  0    25 45 31   22  2  5    55   -57   24  7  7   27 28 56
      6  0  0    22 28  8   22  3 11    53   -59   20 56 15   24  4 11
      7  0  0    19 21 15   22  4 11    50   -62   17 55 13   20 50 48
   ........................... shortened .............................

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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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