Update for (27) Euterpe - September 23/24, 2003

Jan Manek's update

                   IOTA/IOTA-ES occultation update for
         (27) Euterpe / TYC 6844-03116-1 = PPM 733878 on September 23/24, 2003
          visible from N France, SE England, Belgium, Netherlands, N Germany


Summary 

In the night of September 23/24, 2003 a bright 9.7 mag star TYC 6844-03116-1 = PPM 733878 will be occulted by a 124 km asteroid (27) Euterpe. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and UCAC2 star position.

The updated path shows ~1 path width north shift with time ~0.1 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs due to north shift over N France and SE England ~20:24.7 UT, Belgium ~20:24.9 UT, Netherlands ~20:24.9 UT and N Germany ~20:25.0 UT. However only for observers in England and west France the star will be high enough to observe the event reliably. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: September 23, 2003 @ 20:25 UT (Europe)
 * magnitude of target star: 9.7
 * magnitude drop [mag]: 2.5
 * estimated maximum duration [s]: 9.3
 * path description: given above
 * Goffin's original chart reference: A03_0912

The occultation path:
 * approximate ground width [km]: 300
 * uncertainty [path widths]: 0.6
 * uncertainty in time [s]: 10
 * 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 6844-03116-1 = PPM 733878
 * constellation: Sagittarius
 * J2000 position [h,m,s; o,',"]: 18h 19m 29.3404s; -24o 00' 21.262"
 * position source: UCAC2
 * estimated accuracy ["]: 0.03" (0.02", 0.02")
 * V mag [mag]: 9.70
 * B-V [mag]: +2.0
 * remarks:
    Target star is in middle Sagittarius, about 2.4 degrees northwest of 2.8 mag star lambda Sagittarii = SAO 186841.
    !!! 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 3.5x3.5 degrees
 * limiting magnitude is 12.0
 * 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: (27) Euterpe
     approx. diameter [km]: 124
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 131 USNO, 27 TMO
     number of rejected observations: 16 USNO
     time covered by the observations: 1998 02 17 - 2003 08 31
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.04", 0.04"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 20:21.7 UT
 * approx. V mag of minor planet at event [mag]: 12.1
 * geocentric parallax of minor planet ["]: 3.614
 * magnitude drop [mag]: 2.5
 * estimated maximum duration [s]: 9.3
 * apparent motion of minor planet ["/h]: 27.11
 * angular distance to moon, phase of moon [deg,%]: 124, 7%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Sep 23
   27  Euterpe
20h 21.7m UT
   9.7   18 19 29.340-24  0 21.26TYC 6844-03116-1      11.7
12.1    124    9.3   2.433     1.979      0.58
  -32.811 -24.005  -127.31   -0.16
 20.3609  -.02057   .90279  7.50086  0.15975  0.00569  0.00019
2000    212.6480082003 918.00000356.52321794.815570 1.583666  0.171640792.347157981.944289947.005   0.15
RATE 2.7408840 .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
                                                         Latitude   Latitude   Latitude   Latitude
    ...................................... shortened .............................................
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "
   - 15  0  0    43 45 19   20 23 38    20   198   -16   42 23 23   45 11 56   40 50 15   47  3 29
   - 14  0  0    44  2 14   20 23 43    20   199   -17   42 39 49   45 29 26   41  6 11   47 21 51
   - 13  0  0    44 19 56   20 23 48    19   200   -18   42 57  0   45 47 45   41 22 50   47 41  4
   - 12  0  0    44 38 24   20 23 53    19   201   -18   43 14 55   46  6 52   41 40 12   48  1  9
   - 11  0  0    44 57 38   20 23 58    18   201   -19   43 33 35   46 26 47   41 58 17   48 22  6
   - 10  0  0    45 17 38   20 24  3    18   202   -19   43 52 59   46 47 30   42 17  5   48 43 55
   -  9  0  0    45 38 24   20 24  8    17   203   -20   44 13  7   47  9  1   42 36 35   49  6 35
   -  8  0  0    45 59 55   20 24 12    16   204   -20   44 33 58   47 31 20   42 56 46   49 30  7
   -  7  0  0    46 22 12   20 24 17    16   205   -21   44 55 33   47 54 27   43 17 39   49 54 31
   -  6  0  0    46 45 13   20 24 21    15   206   -21   45 17 50   48 18 21   43 39 13   50 19 47
   -  5  0  0    47  8 58   20 24 25    15   207   -22   45 40 50   48 43  2   44  1 28   50 45 54
   -  4  0  0    47 33 28   20 24 29    14   208   -22   46  4 32   49  8 31   44 24 22   51 12 53
   -  3  0  0    47 58 42   20 24 32    13   208   -23   46 28 56   49 34 45   44 47 56   51 40 44
   -  2  0  0    48 24 39   20 24 36    12   209   -23   46 54  1   50  1 47   45 12 10   52  9 27
   -  1  0  0    48 51 18   20 24 39    12   210   -24   47 19 46   50 29 34   45 37  2   52 39  2
      0  0  0    49 18 41   20 24 42    11   211   -24   47 46 12   50 58  7   46  2 32   53  9 28
      1  0  0    49 46 46   20 24 45    10   212   -24   48 13 17   51 27 26   46 28 40   53 40 47
      2  0  0    50 15 32   20 24 48     9   213   -25   48 41  2   51 57 30   46 55 24   54 12 58
      3  0  0    50 44 59   20 24 50     9   213   -25   49  9 24   52 28 19   47 22 44   54 46  1
      4  0  0    51 15  7   20 24 53     8   214   -25   49 38 25   52 59 52   47 50 41   55 19 57
      5  0  0    51 45 55   20 24 55     7   215   -25   50  8  3   53 32 10   48 19 11   55 54 46
      6  0  0    52 17 22   20 24 57     6   216   -25   50 38 17   54  5 12   48 48 16   56 30 28
      7  0  0    52 49 28   20 24 58     6   217   -26   51  9  7   54 38 57   49 17 54   57  7  3
      8  0  0    53 22 13   20 25  0     5   218   -26   51 40 32   55 13 25   49 48  5   57 44 32
      9  0  0    53 55 34   20 25  1     4   218   -26   52 12 31   55 48 36   50 18 46   58 22 57
     10  0  0    54 29 33   20 25  2     3   219   -26   52 45  3   56 24 29   50 49 59   .. .. ..
     11  0  0    55  4  7   20 25  3     2   220   -26   53 18  8   57  1  4   51 21 41   .. .. ..
     12  0  0    55 39 17   20 25  3     2   221   -26   53 51 44   57 38 21   51 53 51   .. .. ..
     13  0  0    56 15  1   20 25  3     1   222   -26   54 25 50   .. .. ..   52 26 30   .. .. ..
     14  0  0    .. .. ..   .. .. ..    ..    ..    ..   55  0 26   .. .. ..   52 59 34   .. .. ..
     15  0  0    .. .. ..   .. .. ..    ..    ..    ..   55 35 30   .. .. ..   53 33  4   .. .. ..
     16  0  0    .. .. ..   .. .. ..    ..    ..    ..   .. .. ..   .. .. ..   54  6 58   .. .. ..
     17  0  0    .. .. ..   .. .. ..    ..    ..    ..   .. .. ..   .. .. ..   54 41 14   .. .. ..
    ...................................... 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-|
--------------------------------------------------------------------U---U---