Update for (410) Chloris - November 19/20, 2003

Jan Manek's update

                  IOTA/IOTA-ES occultation update for
         (410) Chloris / TYC 1372-02290-1 on November 19/20, 2003
           visible from Crete, Greece, Albania, frm. Yugoslavia,
               Slovenia, Austria, Germany and N Netherlands


Summary 

In the night of November 19/20, 2003 a faint 10.4 mag star TYC 1372-02290-1 will be occulted by a 128 km asteroid (410) Chloris. This update is based on USNO/Flagstaff, TMO and Ondrejov astrometry for the asteroid and UCAC2 star position.

The updated path shows ~0.5 path width west shift with time ~0.1 minute later earlier compared to Edwin Goffin's nominal prediction.

Updated path runs due to west shift over Crete ~4:35.5 UT, Greece ~4:36.8 UT, Albania ~4:37.9 UT, frm. Yugoslavia ~4:39.0 UT, Slovenia ~4:40.0 UT, Austria ~4:40.5 UT, Germany from SE to NW around 4:42 UT and finally N Netherlands ~4:43.0 UT. Please check the path chart for details.

Current station list

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: November 20, 2003 @ 04:41 UT (Europe)
 * magnitude of target star: 10.4
 * magnitude drop [mag]: 3.5
 * estimated maximum duration [s]: 24.2
 * path description: given above
 * Goffin's original chart reference: A03_1125

The occultation path:
 * approximate ground width [km]: 160
 * uncertainty [path widths]: 0.5
 * uncertainty in time [s]: 14
 * 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 1372-02290-1
 * constellation: Gemini
 * J2000 position [h,m,s; o,',"]: 07h 29m 50.1554s; +21o 48' 01.222"
 * position source: UCAC2
 * estimated accuracy ["]: 0.03" (0.02", 0.02")
 * V mag [mag]: 10.40
 * B-V [mag]: +0.48
 * remarks:
    Target star is in south Gemini, about 2.3 degrees east of 3.5 mag star delta Geminorum = SAO 79294
    or ~54' north of planetary nebula NGC 2392 = Eskymo nebula. Only 2' west of target is 9.4 mag star
    SAO 79435 = PPM 97435.
    !!! 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: (410) Chloris
     approx. diameter [km]: 128
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), Ondrejov (Kusnirak, Sarounova, Manek)
     number of used observations: 104 USNO, 18 TMO, 9 Ondrejov
     number of rejected observations: 7 USNO, 2 TMO
     time covered by the observations: 1998 09 24 - 2003 11 06
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.03", 0.03"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 04:39.9 UT
 * approx. V mag of minor planet at event [mag]: 13.9
 * geocentric parallax of minor planet ["]: 3.279
 * magnitude drop [mag]: 3.5
 * estimated maximum duration [s]: 24.2
 * apparent motion of minor planet ["/h]: 9.80
 * angular distance to moon, phase of moon [deg,%]: 74, 19%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Nov 20
  410  Chloris
 4h 39.9m UT
  10.4    7 29 50.155 21 48  1.22TYC 1372-02290-1      10.9
13.9    128   24.2   2.682    -0.547      6.19
  -16.319  21.799   106.39  -19.59
  4.6657   .36211   .44359 -2.31920  1.88597 -0.00481  0.00074
2000    191.51303920031117.00000172.10174897.281482 10.926768 0.237601282.727210032.079221448.305   0.15
RATE 2.1883980 .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
     26  0  0    34 56 24    4 35 21    52   261    -4   36  4  7   33 50 13   37 13 32   32 45 27
     25  0  0    35 57 57    4 35 46    52   259    -5   37  6 17   34 51 12   38 16 22   33 45 55
     24  0  0    36 59 28    4 36 12    53   257    -6   38  8 25   35 52 10   39 19 10   34 46 22
     23  0  0    38  0 56    4 36 37    53   255    -8   39 10 28   36 53  5   40 21 53   35 46 46
     22  0  0    39  2 16    4 37  3    54   253    -8   40 12 24   37 53 53   41 24 27   36 47  4
     21  0  0    40  3 25    4 37 29    54   251    -9   41 14  8   38 54 30   42 26 48   37 47 13
     20  0  0    41  4 20    4 37 54    54   249   -10   42 15 36   39 54 55   43 28 54   38 47  9
     19  0  0    42  4 57    4 38 19    54   246   -11   43 16 46   40 55  2   44 30 40   39 46 49
     18  0  0    43  5 13    4 38 44    55   244   -12   44 17 33   41 54 49   45 32  2   40 46 10
     17  0  0    44  5  4    4 39  9    55   242   -13   45 17 54   42 54 12   46 32 56   41 45  8
     16  0  0    45  4 26    4 39 34    55   240   -14   46 17 45   43 53  9   47 33 19   42 43 41
     15  0  0    46  3 17    4 39 58    55   237   -15   47 17  3   44 51 35   48 33  7   43 41 44
     14  0  0    47  1 32    4 40 23    55   235   -16   48 15 43   45 49 27   49 32 15   44 39 16
     13  0  0    47 59  9    4 40 47    55   233   -16   49 13 43   46 46 43   50 30 41   45 36 13
     12  0  0    48 56  3    4 41 10    55   230   -17   50 10 59   47 43 18   51 28 20   46 32 31
     11  0  0    49 52 13    4 41 33    54   228   -18   51  7 27   48 39 11   52 25  9   47 28  8
     10  0  0    50 47 34    4 41 56    54   226   -19   52  3  5   49 34 17   53 21  5   48 23  1
      9  0  0    51 42  4    4 42 18    54   224   -19   52 57 49   50 28 35   54 16  5   49 17  7
      8  0  0    52 35 40    4 42 40    54   222   -20   53 51 36   51 22  1   55 10  5   50 10 24
      7  0  0    53 28 20    4 43  1    53   220   -21   54 44 24   52 14 33   56  3  2   51  2 49
      6  0  0    54 20  0    4 43 22    53   218   -21   55 36 10   53  6  8   56 54 55   51 54 20
      5  0  0    55 10 40    4 43 43    53   216   -22   56 26 52   53 56 45   57 45 40   52 44 54
      4  0  0    56  0 16    4 44  3    52   214   -22   57 16 28   54 46 21   58 35 16   53 34 30
      3  0  0    56 48 47    4 44 22    52   212   -23   58  4 56   55 34 55   59 23 41   54 23  7
      2  0  0    57 36 11    4 44 41    51   210   -23   58 52 15   56 22 25   60 10 53   55 10 42
      1  0  0    58 22 28    4 44 59    51   208   -24   59 38 23   57  8 49   60 56 51   55 57 14
      0  0  0    59  7 36    4 45 17    51   206   -24   60 23 19   57 54  8   61 41 34   56 42 42
   -  1  0  0    59 51 34    4 45 34    50   205   -25   61  7  2   58 38 19   62 25  1   57 27  6
   -  2  0  0    60 34 21    4 45 51    50   203   -25   61 49 33   59 21 23   63  7 12   58 10 23
   -  3  0  0    61 15 59    4 46  7    49   201   -26   62 30 50   60  3 18   63 48  7   58 52 35
   -  4  0  0    61 56 25    4 46 23    49   200   -26   63 10 54   60 44  5   64 27 46   59 33 41
   -  5  0  0    62 35 41    4 46 38    48   198   -26   63 49 45   61 23 43   65  6 10   60 13 40
   -  6  0  0    63 13 46    4 46 53    48   197   -27   64 27 23   62  2 13   65 43 18   60 52 32
   -  7  0  0    63 50 42    4 47  7    47   195   -27   65  3 50   62 39 35   66 19 13   61 30 19
   -  8  0  0    64 26 28    4 47 21    47   194   -27   65 39  5   63 15 50   66 53 54   62  6 59
   -  9  0  0    65  1  6    4 47 34    46   192   -27   66 13 11   63 50 58   67 27 23   62 42 35
    ...................................... 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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