Update for (79) Eurynome - April 15, 2002

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
           (79) Eurynome / TYC 1351-00397-1 on April 15, 2002
  visible from S France, Italy, S Albania, Greece, SW Turkey and Syria


Summary 

In the late evening of April 15, 2002 a 9.6 mag star TYC 1351-00397-1 will be occulted by a 69 km asteroid (79) Eurynome. This update is based on USNO/Flagstaff, TMO and Gnosca astrometry for the asteroid and combined Tycho-2/UCAC star position.

The updated path shows ~1 path width south shift with no time shift compared to Edwin Goffin's nominal prediction.

Updated path runs over south France from NW to SE with Bordeaux just south and Limoges on north limit around 21:13.7 UT. Marseilles is south of path ~21:14.0 UT and few seconds later Nice is on central line. Follows Italy from NW to SE - Rome is on south limit ~21:14.3 UT. South Albania is in path at ~21:14.5 UT, middle Greece at ~21:14.6 UT, southwest Turkey ~21:14.8 UT and NE Cyprus with Syria around 21:15 UT. Within uncertainties is somewhat larger area, please check the path chart for details.

There is only one complication - the occultation is expected to last only ~3 seconds.
Clear sky and good luck !!!

The event at one glimpse:
 * date and approx. UT time of event: April 15, 2002 @ 21:14 UT
 * magnitude of target star: 9.6
 * magnitude drop [mag]: 3.1
 * estimated maximum duration [s]: 3.1
 * path description: given above
 * Goffin's original chart reference: A02_0415

The occultation path:
 * approximate ground width [km]: 85
 * uncertainty [path widths]: 1.6
 * uncertainty in time [s]: 5
 * 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 1351-00397-1
 * constellation: Gemini
 * J2000 position [h,m,s; o,',"]: 07h 21m 24.9848s; +17o 27' 01.572"
 * position source: weighted mean of Tycho-2 and UCAC combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.03" (0.020", 0.020")
 * V mag [mag]: 9.63
 * B-V [mag]: +0.50
 * remarks:
    Recent UCAC position was provided by Marion and Norbert Zacharias.
    Target star is in mid-south Gemini, only 1.2 degrees northwest of 3.6 mag star lambda Geminorum = SAO 96746, so the
    location should be really easy. Please note there is 12.0 mag star only 43" SW of target - this
    companion form a 'bump' on the target star's image on chart at lower right part - it is not separated there.
    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 2.5x2.5 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: 88 USNO, 7 TMO, 14(2) Gnosca
     number of rejected observations: 7 USNO, 1 TMO
     time covered by the observations: 1998 02 02 - 2002 03 27
     rms residuals ["] (RA,DE): 0.07", 0.07"
     estimated positional accuracy at epoch of event ["]: 0.05", 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: 21:11.2 UT
 * approx. V mag of minor planet at event [mag]: 12.6
 * geocentric parallax of minor planet ["]: 3.965
 * magnitude drop [mag]: 3.1
 * estimated maximum duration [s]: 3.1
 * apparent motion of minor planet ["/h]: 49.59
 * angular distance to moon, phase of moon [deg,%]: 49, 9%
 * 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  '  "
   - 14  0  0    48 32 38   21 13  1    46   -14   48  9  5   48 56 18
   - 13  0  0    48 21 30   21 13  4    46   -14   47 57 55   48 45 12
   - 12  0  0    48 10  7   21 13  7    45   -15   47 46 30   48 33 51
   - 11  0  0    47 58 30   21 13 10    45   -16   47 34 51   48 22 16
   - 10  0  0    47 46 39   21 13 13    44   -16   47 22 58   48 10 27
   -  9  0  0    47 34 33   21 13 16    44   -17   47 10 50   47 58 23
   -  8  0  0    47 22 12   21 13 19    43   -18   46 58 27   47 46  4
   -  7  0  0    47  9 37   21 13 22    43   -18   46 45 50   47 33 31
   -  6  0  0    46 56 48   21 13 25    42   -19   46 32 59   47 20 44
   -  5  0  0    46 43 44   21 13 28    42   -20   46 19 54   47  7 42
   -  4  0  0    46 30 27   21 13 31    41   -21   46  6 34   46 54 27
   -  3  0  0    46 16 55   21 13 34    41   -21   45 53  1   46 40 57
   -  2  0  0    46  3 10   21 13 37    40   -22   45 39 13   46 27 14
   -  1  0  0    45 49 11   21 13 40    39   -23   45 25 12   46 13 16
      0  0  0    45 34 58   21 13 43    39   -23   45 10 58   45 59  5
      1  0  0    45 20 31   21 13 46    38   -24   44 56 30   45 44 41
      2  0  0    45  5 52   21 13 48    37   -25   44 41 48   45 30  3
      3  0  0    44 50 59   21 13 51    37   -25   44 26 53   45 15 12
      4  0  0    44 35 53   21 13 54    36   -26   44 11 46   45  0  8
      5  0  0    44 20 35   21 13 57    36   -27   43 56 26   44 44 51
      6  0  0    44  5  3   21 13 60    35   -27   43 40 53   44 29 21
      7  0  0    43 49 19   21 14  2    34   -28   43 25  7   44 13 39
      8  0  0    43 33 23   21 14  5    33   -29   43  9 10   43 57 45
      9  0  0    43 17 15   21 14  8    33   -29   42 53  0   43 41 38
     10  0  0    43  0 56   21 14 10    32   -30   42 36 39   43 25 20
     11  0  0    42 44 24   21 14 13    31   -31   42 20  6   43  8 50
     12  0  0    42 27 42   21 14 15    31   -31   42  3 22   42 52  8
     13  0  0    42 10 48   21 14 18    30   -32   41 46 27   42 35 16
     14  0  0    41 53 43   21 14 20    29   -32   41 29 22   42 18 13
     15  0  0    41 36 28   21 14 23    28   -33   41 12  5   42  0 59
     16  0  0    41 19  3   21 14 25    28   -34   40 54 39   41 43 35
     17  0  0    41  1 28   21 14 27    27   -34   40 37  3   41 26  1
     18  0  0    40 43 44   21 14 29    26   -35   40 19 18   41  8 17
     19  0  0    40 25 50   21 14 32    25   -36   40  1 23   40 50 25
     20  0  0    40  7 47   21 14 34    25   -36   39 43 19   40 32 23
     21  0  0    39 49 36   21 14 36    24   -37   39 25  7   40 14 12
     22  0  0    39 31 16   21 14 38    23   -37   39  6 47   39 55 53
     23  0  0    39 12 49   21 14 40    22   -38   38 48 19   39 37 27
     24  0  0    38 54 14   21 14 42    21   -39   38 29 44   39 18 52
     25  0  0    38 35 32   21 14 44    21   -39   38 11  1   39  0 11
     26  0  0    38 16 44   21 14 45    20   -40   37 52 12   38 41 23
     27  0  0    37 57 49   21 14 47    19   -40   37 33 17   38 22 28
     28  0  0    37 38 48   21 14 49    18   -41   37 14 16   38  3 28
     29  0  0    37 19 42   21 14 50    17   -41   36 55 10   37 44 22
     30  0  0    37  0 31   21 14 52    16   -42   36 35 59   37 25 11
     31  0  0    36 41 15   21 14 53    16   -42   36 16 43   37  5 55
     32  0  0    36 21 55   21 14 55    15   -43   35 57 23   36 46 35
     33  0  0    36  2 32   21 14 56    14   -43   35 37 60   36 27 11
     34  0  0    35 43  5   21 14 57    13   -44   35 18 33   36  7 44
     35  0  0    35 23 35   21 14 59    12   -44   34 59  4   35 48 14
     36  0  0    35  4  3   21 14 60    11   -45   34 39 32   35 28 42
     37  0  0    34 44 29   21 15  1    10   -45   34 19 59   35  9  8
     38  0  0    34 24 54   21 15  2    10   -46   34  0 24   34 49 32
     39  0  0    34  5 18   21 15  3     9   -46   33 40 49   34 29 56
     40  0  0    33 45 42   21 15  3     8   -46   33 21 13   34 10 19
     41  0  0    33 26  6   21 15  4     7   -47   33  1 37   33 50 42
     42  0  0    33  6 30   21 15  5     6   -47   32 42  2   33 31  5
   ........................... 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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