Update for (79) Eurynome - March 14, 2002

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
     (79) Eurynome / SAO 96055 = TYC 1334-00068-1 on March 14, 2002
         visible from S Spain, N Algeria, N Tunisia, S Sicily,
               S Greece, N Cyprus, Syria, Iraq and Iran

Summary 

In the evening of March 14, 2002 a 9.6 mag star SAO 96055 = TYC 1334-00068-1 will be occulted by a 69 km asteroid (79) Eurynome. This update is based on USNO/Flagstaff and Gnosca astrometry for the asteroid and combined Tycho-2/UCAC star position.

The updated path shows ~1 path width south shift with time ~0.2 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs over S Spain around 20:23 UT with Jerez, Malaga and Almeria in path, N Algeria with El-Djazair on south limit ~20:24 UT, N Tunisia with Tunis on south limit ~20:24.9 UT, S Sicily ~20:25.4 UT, S Greece ~20:26.3 UT, N Cyprus with Nicosia ~20:27.4 UT, Syria ~20:27.8 UT, Iraq ~20:28.3 UT and Iran ~20:29 UT. Larger area is covered taking uncertainty into consideration. Please check the path chart for details.

Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: March 14, 2002 @ 20:25 UT
 * magnitude of target star: 9.6
 * magnitude drop [mag]: 2.5
 * estimated maximum duration [s]: 6.2
 * path description: given above
 * Goffin's original chart reference: A02_0313

The occultation path:
 * approximate ground width [km]: 75
 * uncertainty [path widths]: 1.1
 * 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: SAO 96055 = PPM 122957 = TYC 1898-00944-1
 * constellation: Gemini
 * J2000 position [h,m,s; o,',"]: 06h 44m 29.4610s; +17o 11' 04.213"
 * position source: Tycho-2 and UCAC combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.02" (0.010", 0.013")
 * V mag [mag]: 9.56
 * B-V [mag]: +1.21
 * remarks:
    Recent UCAC position was provided by Marion and Norbert Zacharias.
    Target star is in southwest Gemini, about 1.8 degrees NE of 2.0 mag gamma Geminorum = SAO 95912.
    Target star is the southern one in a pair, northern one is GSC 1334.896 about 80" north and
    about 0.5 mag fainter that target. It is on dense Milky Way field, so be sure to have enough
    time to locate the correct star. 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.

Close finding chart (prepared in GUIDE7):
 * occulted star is in center - labeled with cross
 * field is 2.0x2.0 degrees
 * limiting magnitude is 12.5
 * labeled stars have indicated SAO numbers
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (79) Eurynome
     approx. diameter [km]: 69
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone), TMO (Bill Owen), Gnosca (Stefano Sposetti)
     number of used observations: 83 USNO, 5 TMO, 14(2) Gnosca
     number of rejected observations: 5 USNO, 1 TMO
     time covered by the observations: 1998 02 02 - 2002 03 05
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.04", 0.05"
     remarks: Sposetti's frames were reduced by Raoul Behrend.
       From 14 individual Gnosca positions were computed 2 mean positions,
       used in the final orbit computation.

Data for the event:
 * UT date and time of least geocentric approach: 20:20.9 UT
 * approx. V mag of minor planet at event [mag]: 12.0
 * geocentric parallax of minor planet ["]: 4.966
 * magnitude drop [mag]: 2.5
 * estimated maximum duration [s]: 6.2
 * apparent motion of minor planet ["/h]: 31.00
 * angular distance to moon, phase of moon [deg,%]: 98, 1%
 * remarks:

Calculator(s): Jan Manek





Path coordinates:
                                                   Latitude   Latitude
                  Center               Altitude       Path Limits
  E. Longitude   Latitude      U.T.   star   sun   Limit 1    Limit 2
   ........................... shortened .............................
      o  '  "     o  '  "    h  m  s     o     o    o  '  "    o  '  "
   - 12  0  0    36 12 13   20 21 57    71   -18   35 52 26   36 32  2
   - 10  0  0    36 23 30   20 22 14    70   -20   36  3 44   36 43 17
   -  8  0  0    36 33 33   20 22 30    69   -22   36 13 49   36 53 18
   -  6  0  0    36 42 23   20 22 47    68   -23   36 22 41   37  2  7
   -  4  0  0    36 49 60   20 23  3    67   -25   36 30 19   37  9 43
   -  2  0  0    36 56 24   20 23 19    66   -26   36 36 43   37 16  6
      0  0  0    37  1 34   20 23 35    65   -28   36 41 55   37 21 16
      2  0  0    37  5 32   20 23 51    64   -29   36 45 53   37 25 13
      4  0  0    37  8 17   20 24  7    63   -31   36 48 38   37 27 57
      6  0  0    37  9 49   20 24 22    61   -32   36 50 10   37 29 29
      8  0  0    37 10  8   20 24 37    60   -34   36 50 30   37 29 48
     10  0  0    37  9 14   20 24 52    59   -35   36 49 36   37 28 54
     12  0  0    37  7  8   20 25  7    57   -37   36 47 29   37 26 49
     14  0  0    37  3 49   20 25 22    56   -38   36 44 10   37 23 30
     16  0  0    36 59 18   20 25 36    54   -40   36 39 38   37 19  0
     18  0  0    36 53 34   20 25 50    53   -41   36 33 53   37 13 18
     20  0  0    36 46 39   20 26  4    51   -42   36 26 57   37  6 23
     22  0  0    36 38 31   20 26 18    50   -44   36 18 48   36 58 17
     24  0  0    36 29 12   20 26 31    48   -45   36  9 27   36 48 59
     26  0  0    36 18 41   20 26 44    47   -46   35 58 54   36 38 30
     28  0  0    36  6 59   20 26 57    45   -48   35 47 10   36 26 50
     30  0  0    35 54  5   20 27  9    44   -49   35 34 15   36 13 58
     32  0  0    35 40  1   20 27 21    42   -50   35 20  8   35 59 56
     34  0  0    35 24 46   20 27 33    41   -52   35  4 51   35 44 43
     36  0  0    35  8 21   20 27 45    39   -53   34 48 24   35 28 21
     38  0  0    34 50 46   20 27 56    37   -54   34 30 46   35 10 49
     40  0  0    34 32  3   20 28  7    36   -55   34 12  0   34 52  7
     42  0  0    34 12 10   20 28 17    34   -56   33 52  5   34 32 18
     44  0  0    33 51 10   20 28 27    32   -57   33 31  2   34 11 20
     46  0  0    33 29  2   20 28 37    31   -58   33  8 51   33 49 15
     48  0  0    33  5 48   20 28 46    29   -59   32 45 34   33 26  4
     50  0  0    32 41 28   20 28 55    27   -59   32 21 11   33  1 47
     52  0  0    32 16  4   20 29  3    25   -60   31 55 44   32 36 25
     54  0  0    31 49 36   20 29 11    24   -61   31 29 14   32 10  1
     56  0  0    31 22  6   20 29 18    22   -61   31  1 41   31 42 34
     58  0  0    30 53 35   20 29 25    20   -61   30 33  7   31 14  6
     60  0  0    30 24  5   20 29 31    18   -62   30  3 35   30 44 39
     62  0  0    29 53 38   20 29 37    16   -62   29 33  4   30 14 14
     64  0  0    29 22 14   20 29 42    15   -62   29  1 38   29 42 53
     66  0  0    28 49 56   20 29 47    13   -62   28 29 17   29 10 37
     68  0  0    28 16 46   20 29 51    11   -61   27 56  5   28 37 30
     70  0  0    27 42 46   20 29 54     9   -61   27 22  3   28  3 33
     72  0  0    27  7 59   20 29 57     7   -60   26 47 13   27 28 47
   ........................... 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---