Update for (524) Fidelio - November 25, 2000

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
          (524) Fidelio / TYC 5789-00321-1 on November 25, 2000
                  visible from Sicily, Albania, N Greece,
              Bulgaria, SE Romania, SE Ukraine and S Russia

Summary 

In the evening of November 25, 2000 a faint 11.4 mag star TYC 5789-00321-1 will be occulted by a 74 km asteroid (524) Fidelio. This update is based on USNO/Flagstaff, TMO and Gnosca astrometry for the asteroid and Tycho-2 star position.

The updated path shows ~2 path width south shift and time ~0.2 minutes earlier compared to Edwin Goffin's nominal prediction.

The path of this occultation runs over Sicily and very south Italy ~17:10.5 UT, Albania and Bulgaria around ~17:11 UT, SE Romania ~17:11.4 UT, SE Ukraine ~17:11.7 UT and south Russia around 17:12 UT.

There is large 4 path width uncertainty, so extra travel to the occultation path isn't recommended, also as the event is very short and star rather faint. However observers within uncertainty limits should give a try from their permanent sites.

Good weather and good luck !

The event at one glimpse:
 * date and approx. UT time of event: November 25, 2000 @ 17:11 UT (Euro)
 * magnitude of target star: 11.4
 * magnitude drop [mag]: 3.4
 * estimated maximum duration [s]: 3.6
 * path description: given above
 * Goffin's original chart reference: A00_1116

The occultation path:
 * approximate ground width [km]: 95
 * uncertainty [path widths]: 4
 * uncertainty in time [s]: 15
 * map: below
 * remarks: Path uncertainities are given according to nominal star
    position errors and expected asteroid positional accuracy.
    !!!!!!!
    Circles along path indicates the centerline for this event.
    They are more accurate than the path limit lines.
    !!!!!!!

Data for the target star:
 * name: TYC 5789-00321-1
 * constellation: Capricornus
 * J2000 position [h,m,s; o,',"]: 21h 54m 04.015s; -08o 55' 17.88"
 * position source: Tycho-2
 * estimated accuracy ["]: 0.11" (0.07", 0.08")
 * V mag [mag]: 11.44
 * B-V [mag]: +0.37
 * remarks:
     Target star is in very NE Capricornus, near middle Aquarius, about 6.5
     degrees SE of 2.9 mag star beta Aquarii = SAO 145457.

Close finding chart (prepared in GUIDE7):
 * 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





Data for the minor planet:
 * general information:
     number, name: (524) Fidelio
     approx. diameter [km]: 74
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen),
                                Gnosca (Stefano Sposetti)
     number of used observations: 64 USNO, 1 TMO, 5(1) Gnosca
     number of rejected observations: 9 USNO
     time covered by the observations: 1998 03 12 - 2000 11 21
     rms residuals ["] (RA,DE): 0.10", 0.09"
     estimated positional accuracy at epoch of event ["]: 0.10"
     remarks: Gnosca frames of Stefano Sposetti were reduced by Raoul Behrend;
       mean of the 5 original positions was used in computation.

Data for the event:
 * UT date and time of least geocentric approach: 17:08.4 UT
 * approx. V mag of minor planet at event [mag]: 14.7
 * geocentric parallax of minor planet ["]: 3.805
 * magnitude drop [mag]: 3.4
 * estimated maximum duration [s]: 3.6
 * apparent motion of minor planet ["/h]: 44.48
 * angular distance to moon, phase of moon [deg,%]: 87, 0%
 * remarks:

Calculator(s): Jan Manek





Path coordinates:
                                       Altitude
  E. Longitude    Latitude     U.T.    star  sun
   ........ shortened ..........................
      o  '  "     o  '  "    h  m  s     o     o
      6  0  0    33 16 38   17  9 45    48    -9
      8  0  0    34 16 11   17  9 55    47   -10
     10  0  0    35 15 56   17 10  5    46   -12
     12  0  0    36 15 43   17 10 14    45   -14
     14  0  0    37 15 27   17 10 23    43   -16
     16  0  0    38 14 57   17 10 32    42   -18
     18  0  0    39 14  6   17 10 41    41   -20
     20  0  0    40 12 48   17 10 49    39   -21
     22  0  0    41 10 54   17 10 56    38   -23
     24  0  0    42  8 17   17 11  4    36   -25
     26  0  0    43  4 52   17 11 11    35   -26
     28  0  0    44  0 31   17 11 17    33   -28
     30  0  0    44 55 10   17 11 24    32   -29
     32  0  0    45 48 44   17 11 30    31   -31
     34  0  0    46 41  7   17 11 35    29   -32
     36  0  0    47 32 15   17 11 41    28   -33
     38  0  0    48 22  6   17 11 45    26   -35
     40  0  0    49 10 35   17 11 50    25   -36
     42  0  0    49 57 41   17 11 54    23   -37
     44  0  0    50 43 20   17 11 58    22   -38
     46  0  0    51 27 33   17 12  2    20   -39
     48  0  0    52 10 16   17 12  5    19   -40
     50  0  0    52 51 30   17 12  8    18   -41
     52  0  0    53 31 13   17 12 11    16   -42
     54  0  0    54  9 27   17 12 13    15   -43
     56  0  0    54 46 10   17 12 15    14   -43
     58  0  0    55 21 23   17 12 17    12   -44
     60  0  0    55 55  8   17 12 19    11   -45
     62  0  0    56 27 24   17 12 21    10   -45
     64  0  0    56 58 12   17 12 22     9   -46
     66  0  0    57 27 35   17 12 23     8   -46
   ........ 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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