Update for (663) Gerlinde - April 23/24, 2003

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
            (663) Gerlinde / TAC +03 03980 on April 23/24, 2003
        visible from Libya, N Egypt, middle East, S Iraq and Iran

Summary 

In the night of April 23/24, 2003 a bright 9.0 mag star TAC +03 03980 will be occulted by a 104 km asteroid (663) Gerlinde. This update is based on USNO/Flagstaff and TMO astrometry for the asteroid and recent UCAC star position.

The updated path shows ~8 path width south shift with no time correction compared to Edwin Goffin's nominal prediction.

Updated path runs over Libya ~18:20.3 UT, N Egypt ~18:21.0 UT, middle East around 18:21.3 UT, S Iraq ~18:21.7 UT and Iran ~18:22.0 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: April 23, 2003 @ 18:21 UT (Egypt)
 * magnitude of target star: 10.9
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 4.8
 * path description: given above
 * Goffin's original chart reference: A03_0452

The occultation path:
 * approximate ground width [km]: 115
 * uncertainty [path widths]: 1.1
 * uncertainty in time [s]: 6
 * map: below
 * remarks: Path uncertainties are given according to nominal star
    position errors and expected asteroid positional accuracy.

Data for the target star:
 * name: TAC +03 03980 = GSC 0182-02340
 * constellation: Canis Minor
 * J2000 position [h,m,s; o,',"]: 07h 32m 41.4629s; +03o 25' 50.866"
 * position source: recent UCAC position combined with derived proper motion
 * estimated accuracy ["]: 0.02" (0.01", 0.02")
 * V mag [mag]: 10.9
 * B-V [mag]: +0.6
 * remarks:
    Target star is in south Canis Minor, about 2.4 degrees SW of 0.5 mag star alpha Canis Minoris = SAO 115756 or
    11' NW of 5.6 mag star delta2 Canis Minoris = SAO 115610.
    !!! 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 6.0x6.0 degrees
 * limiting magnitude is 11.2
 * labeled stars have indicated SAO numbers
 * remarks: Second chart shows 30' blowup to show correctly the star in Milky Way field.








Data for the minor planet:
 * general information:
     number, name: (663) Gerlinde
     approx. diameter [km]: 104
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen)
     number of used observations: 115 USNO, 11 TMO
     number of rejected observations: 12 USNO
     time covered by the observations: 1998 02 12 - 2003 03 13
     rms residuals ["] (RA,DE): 0.08", 0.08"
     estimated positional accuracy at epoch of event ["]: 0.06", 0.06"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 18:17.8 UT
 * approx. V mag of minor planet at event [mag]: 14.5
 * geocentric parallax of minor planet ["]: 3.313
 * magnitude drop [mag]: 3.6
 * estimated maximum duration [s]: 4.8
 * apparent motion of minor planet ["/h]: 40.68
 * angular distance to moon, phase of moon [deg,%]: 154, 47%
 * remarks:

Elements for WinOccult:
============ cut here ===========================================
 2003 Apr 23
663 Gerlinde
18h 17.8m UT
 +03 03980  10.9    7 32 41.463  3 25 50.87TAC +03 03980
14.5    104    4.8   2.654     2.696      5.10
  -12.661   3.430   -94.86   12.58
 18.2969  -.04801   .37038 12.17958  1.54196  0.00547 -0.00117
2000    325.2356272003 421.00000310.379613233.08571317.845836 0.154675543.062148592.588509109.215   0.15
RATE 1.8393520 .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  '  "
      6  0  0    27 48 48   18 19 28    60   220    -4   27 18 17   28 19 25   26 10 56   29 27 48
      8  0  0    28  0 18   18 19 37    58   223    -6   27 29 48   28 30 54   26 22 29   29 39 15
     10  0  0    28 11 21   18 19 45    57   226    -7   27 40 52   28 41 57   26 33 34   29 50 16
     12  0  0    28 21 57   18 19 54    55   229    -9   27 51 29   28 52 32   26 44 13   30  0 49
     14  0  0    28 32  4   18 20  2    54   231   -10   28  1 37   29  2 38   26 54 23   30 10 54
     16  0  0    28 41 43   18 20 10    53   233   -12   28 11 17   29 12 16   27  4  4   30 20 30
     18  0  0    28 50 53   18 20 17    51   235   -14   28 20 27   29 21 25   27 13 16   30 29 37
     20  0  0    28 59 32   18 20 25    49   237   -15   28 29  7   29 30  4   27 21 58   30 38 14
     22  0  0    29  7 42   18 20 32    48   239   -17   28 37 17   29 38 13   27 30  9   30 46 21
     24  0  0    29 15 20   18 20 40    46   241   -18   28 44 57   29 45 51   27 37 50   30 53 58
     26  0  0    29 22 28   18 20 47    45   243   -20   28 52  5   29 52 57   27 44 59   31  1  3
     28  0  0    29 29  4   18 20 53    43   245   -21   28 58 41   29 59 33   27 51 37   31  7 37
     30  0  0    29 35  8   18 21  0    41   246   -23   29  4 46   30  5 36   27 57 43   31 13 40
     32  0  0    29 40 40   18 21  6    40   248   -24   29 10 18   30 11  8   28  3 16   31 19 10
     34  0  0    29 45 39   18 21 12    38   249   -26   29 15 18   30 16  7   28  8 17   31 24  8
     36  0  0    29 50  6   18 21 18    36   250   -27   29 19 46   30 20 34   28 12 45   31 28 34
     38  0  0    29 54  1   18 21 24    35   252   -29   29 23 40   30 24 27   28 16 40   31 32 27
     40  0  0    29 57 22   18 21 29    33   253   -30   29 27  1   30 27 48   28 20  2   31 35 47
     42  0  0    30  0 10   18 21 34    31   254   -31   29 29 50   30 30 36   28 22 51   31 38 35
     44  0  0    30  2 25   18 21 39    30   256   -33   29 32  5   30 32 51   28 25  7   31 40 49
     46  0  0    30  4  6   18 21 44    28   257   -34   29 33 46   30 34 32   28 26 48   31 42 30
     48  0  0    30  5 14   18 21 48    26   258   -35   29 34 55   30 35 40   28 27 57   31 43 38
     50  0  0    30  5 49   18 21 52    24   259   -36   29 35 29   30 36 15   28 28 32   31 44 13
     52  0  0    30  5 51   18 21 56    23   260   -37   29 35 31   30 36 17   28 28 33   31 44 15
     54  0  0    30  5 19   18 22  0    21   262   -39   29 34 59   30 35 45   28 28  1   31 43 43
     56  0  0    30  4 14   18 22  3    19   263   -40   29 33 54   30 34 40   28 26 55   31 42 39
     58  0  0    30  2 36   18 22  6    18   264   -41   29 32 16   30 33  3   28 25 17   31 41  2
     60  0  0    30  0 25   18 22  9    16   265   -42   29 30  5   30 30 52   28 23  5   31 38 52
     62  0  0    29 57 42   18 22 11    14   266   -43   29 27 21   30 28  9   28 20 21   31 36  9
     64  0  0    29 54 26   18 22 14    12   267   -43   29 24  4   30 24 53   28 17  3   31 32 55
     66  0  0    29 50 37   18 22 16    11   268   -44   29 20 16   30 21  5   28 13 14   31 29  8
     68  0  0    29 46 17   18 22 17     9   269   -45   29 15 55   30 16 45   28  8 52   31 24 49
     70  0  0    29 41 24   18 22 18     7   270   -46   29 11  2   30 11 53   28  3 58   31 19 58
     72  0  0    29 36  1   18 22 20     5   271   -46   29  5 38   30  6 30   27 58 32   31 14 36
     74  0  0    29 30  6   18 22 20     4   272   -47   28 59 42   30  0 36   27 52 36   31  8 43
    ...................................... 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---