Update for (159) Aemilia - March 25/26, 2003

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
           (159) Aemilia / TYC 0858-00862-1 on March 25/26, 2003
        visible from Caucasus, very SW Russia, Ukraine, SW Belarus,
                     NE Poland, S Sweden and S Norway

Summary 

In the night of March 25/26, 2003 a faint 11.5 mag star TYC 0858-00862-1 will be occulted by a 131 km asteroid (159) Aemilia. This update is based on USNO/Flagstaff for the asteroid and recent UCAC star position.

The updated path shows ~2.0 path width south shift with time 0.7 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over Caucasus ~23:09.5 UT, very SW Russia ~23:10.2 UT with Krasnodar on north limit, Ukraine ~23:11.5 UT with Kiev and Dnepropetrovsk just north of limit, SW Belarus ~23:12.5 UT, NE Poland ~23:12.7 UT, S Sweden ~23:13.9 UT and S Norway ~23:14.5 UT. Please check the path chart for details.

This update was computed with a Beta version of Winoccult, so you can notice a slightly different path chart header and more items in table of path limits (still more columns to appear there in future). OCCELMNT files should be compatible. Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: March 25, 2003 @ 23:13 UT (Europe)
 * magnitude of target star: 11.5
 * magnitude drop [mag]: 1.3
 * estimated maximum duration [s]: 12.5
 * path description: given above
 * Goffin's original chart reference: A03_0316

The occultation path:
 * approximate ground width [km]: 200
 * uncertainty [path widths]: 0.6
 * uncertainty in time [s]: 7
 * 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 0858-00862-1
 * constellation: Leo
 * J2000 position [h,m,s; o,',"]: 11h 16m 51.5262s; +10o 45' 50.927"
 * position source: recent UCAC position combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.02" (0.01", 0.02")
 * V mag [mag]: 11.47
 * B-V [mag]: +0.86
 * remarks:
    Target star is in middle-south Leo, about 4.7 degrees south of 3.3 mag star theta Leonis = SAO 99512
    or 1.7 degrees west of 4.0 mag star iota Leonis = SAO 99587. Target star itself is in a group of stars,
    check the detailed chart for details.
    !!! 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 4.0x4.0 degrees
 * limiting magnitude is 12.5
 * labeled stars have indicated SAO numbers
 * remarks: Second chart is 30' blowup to show correctly the target star in the field.








Data for the minor planet:
 * general information:
     number, name: (159) Aemilia
     approx. diameter [km]: 131
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 146 USNO
     number of rejected observations: 24 USNO
     time covered by the observations: 1998 01 29 - 2003 03 15
     rms residuals ["] (RA,DE): 0.07", 0.08"
     estimated positional accuracy at epoch of event ["]: 0.04", 0.05"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 23:11.8 UT
 * approx. V mag of minor planet at event [mag]: 12.4
 * geocentric parallax of minor planet ["]: 4.507
 * magnitude drop [mag]: 1.3
 * estimated maximum duration [s]: 12.5
 * apparent motion of minor planet ["/h]: 26.75
 * angular distance to moon, phase of moon [deg,%]: 120, 41%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Mar 25
 159  Aemilia
23h 11.8m UT
  11.5   11 16 51.526 10 45 50.93TYC 0858-00862-1      12.3
12.4    131   12.5   1.951    -1.614     12.20
   -1.730  10.762  -166.45    1.95
 23.1964   .33002   .64397 -5.28080  2.70942  0.00150 -0.00123
2000    50.55769852003 322.00000335.942381134.3350586.129046  0.111922933.100621272.753590668.115   0.15
RATE 1.8052236 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000
============ cut here ===========================================

Calculator(s): Jan Manek









Path coordinates:
                  Centre              Star  Star   Sun      Path Limits
  E. Longitude   Latitude      U.T.    Alt    Az   Alt    Limit 1    Limit 2
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "
                                                         Latitude   Latitude
  ............................. shortened ..................................
      o  '  "     o  '  "    h  m  s     o     o    o  '  "    o  '  "
                                                   Latitude   Latitude
     47  0  0    38 53 30   23  8 57    39   250   -39   39 58 51   37 49 46
     46  0  0    39 29 35   23  9  7    39   249   -39   40 35 19   38 25 31
     45  0  0    40  5 52   23  9 16    40   247   -39   41 11 58   39  1 26
     44  0  0    40 42 18   23  9 25    40   246   -39   41 48 46   39 37 32
     43  0  0    41 18 53   23  9 35    41   245   -39   42 25 43   40 13 47
     42  0  0    41 55 35   23  9 44    41   243   -39   43  2 48   40 50  9
     41  0  0    42 32 23   23  9 54    41   242   -39   43 39 58   41 26 37
     40  0  0    43  9 16   23 10  4    42   241   -39   44 17 12   42  3 10
     39  0  0    43 46 12   23 10 13    42   239   -39   44 54 29   42 39 47
     38  0  0    44 23 10   23 10 23    42   238   -39   45 31 47   43 16 26
     37  0  0    45  0  8   23 10 32    43   236   -39   46  9  5   43 53  5
     36  0  0    45 37  4   23 10 42    43   235   -39   46 46 21   44 29 43
     35  0  0    46 13 58   23 10 51    43   233   -38   47 23 34   45  6 20
     34  0  0    46 50 48   23 11  1    43   232   -38   48  0 43   45 42 52
     33  0  0    47 27 32   23 11 10    43   230   -38   48 37 45   46 19 20
     32  0  0    48  4  8   23 11 20    43   228   -38   49 14 39   46 55 41
     31  0  0    48 40 37   23 11 29    43   227   -37   49 51 24   47 31 54
     30  0  0    49 16 55   23 11 38    43   225   -37   50 27 58   48  7 58
     29  0  0    49 53  2   23 11 47    43   224   -37   51  4 19   48 43 51
     28  0  0    50 28 56   23 11 56    43   222   -36   51 40 27   49 19 33
     27  0  0    51  4 36   23 12  6    43   221   -36   52 16 20   49 55  1
     26  0  0    51 40  0   23 12 14    43   219   -35   52 51 56   50 30 14
     25  0  0    52 15  7   23 12 23    43   218   -35   53 27 14   51  5 11
     24  0  0    52 49 56   23 12 32    43   216   -35   54  2 13   51 39 51
     23  0  0    53 24 25   23 12 40    43   215   -34   54 36 51   52 14 12
     22  0  0    53 58 34   23 12 49    43   213   -34   55 11  7   52 48 14
     21  0  0    54 32 20   23 12 57    43   212   -33   55 45  0   53 21 55
     20  0  0    55  5 44   23 13  5    42   210   -33   56 18 29   53 55 14
     19  0  0    55 38 44   23 13 14    42   209   -32   56 51 33   54 28 10
     18  0  0    56 11 18   23 13 21    42   207   -32   57 24 10   55  0 42
     17  0  0    56 43 27   23 13 29    42   206   -31   57 56 20   55 32 49
     16  0  0    57 15  8   23 13 37    41   204   -31   58 28  2   56  4 31
     15  0  0    57 46 22   23 13 44    41   203   -30   58 59 15   56 35 45
     14  0  0    58 17  8   23 13 52    41   201   -30   59 29 58   57  6 33
     13  0  0    58 47 24   23 13 59    41   200   -29   60  0 10   57 36 52
     12  0  0    59 17 10   23 14  6    40   199   -29   60 29 52   58  6 43
     11  0  0    59 46 26   23 14 13    40   197   -28   60 59  1   58 36  4
     10  0  0    60 15 11   23 14 20    40   196   -28   61 27 39   59  4 56
      9  0  0    60 43 24   23 14 26    39   195   -27   61 55 44   59 33 17
      8  0  0    61 11  6   23 14 33    39   193   -27   62 23 16   60  1  8
      7  0  0    61 38 16   23 14 39    39   192   -26   62 50 15   60 28 27
      6  0  0    62  4 53   23 14 45    38   191   -26   63 16 40   60 55 16
      5  0  0    62 30 58   23 14 51    38   189   -25   63 42 32   61 21 32
      4  0  0    62 56 31   23 14 57    38   188   -25   64  7 51   61 47 17
      3  0  0    63 21 30   23 15  3    37   187   -24   64 32 36   62 12 31
  ............................. 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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