Update for (1297) Quadea - April 8, 2002

Jan Manek's update

                    IOTA/IOTA-ES occultation update for
           (1297) Quadea / TYC 1342-00814-1 on April 8, 2002
            visible from S France, Sardinia, S Italy/Sicily,
                    NE Egypt, Sinai and Saudi Arabia


Summary 

In the evening of April 8, 2002 a faint 11.2 mag star TYC 1342-00814-1 will be occulted by a 66 km asteroid (1297) Quadea. This update is based on USNO/Flagstaff astrometry for the asteroid and combined Tycho-2/UCAC star position.

The updated path shows ~6 path widths north shift with time ~0.4 minutes later compared to Edwin Goffin's nominal prediction.

Updated path runs over south France with Toulouse on north limit around ~19:28.4 UT and Perpignan in path few seconds later. Follows north Sardinia ~19:29 UT, NE Sicily and very SW Italy - area around Messina strait around 19:29.4 UT, NE Egypt (area of delta of Nil) with Alexandria and Cairo around 19:30.4 UT. Few seconds later follows Sinai peninsula and deserts in Saudi Arabia ~19:31 UT. Within uncertainties is also NE Spain, large part of south France, Corse, large part of Italy with Rome, S Greece and Crete. 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 8, 2002 @ 19:29 UT
 * magnitude of target star: 11.2
 * magnitude drop [mag]: 5.2
 * estimated maximum duration [s]: 3.1
 * path description: given above
 * Goffin's original chart reference: A02_0449

The occultation path:
 * approximate ground width [km]: 75
 * uncertainty [path widths]: 3.5
 * uncertainty in time [s]: 15
 * 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 1342-00814-1
 * constellation: Gemini
 * J2000 position [h,m,s; o,',"]: 06h 44m 11.8068s; +22o 24' 01.991"
 * position source: UCAC combined with Tycho-2 proper motion
 * estimated accuracy ["]: 0.01" (0.010", 0.010")
 * V mag [mag]: 11.19
 * B-V [mag]: +0.23
 * remarks:
    Recent UCAC position was provided by Marion and Norbert Zacharias.
    Target star is in mid-east Gemini, only 2.7 degrees south of 3.0 mag star epsilon Geminorum = SAO 78682.
    Location should be really easy, bright Jupiter shines 2.5 degreed NE of target.
    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 13.0
 * labeled stars have indicated SAO numbers
 * remarks:





Data for the minor planet:
 * general information:
     number, name: (1297) Quadea
     approx. diameter [km]: 66
 * orbital information
     orbit source: calculation Manek
     source of used astrometry: USNO/Flagstaff (Ron Stone)
     number of used observations: 74 USNO
     number of rejected observations: 15 USNO
     time covered by the observations: 1998 03 20 - 2002 02 20
     rms residuals ["] (RA,DE): 0.11", 0.13"
     estimated positional accuracy at epoch of event ["]: 0.097", 0.098"
     remarks:

Data for the event:
 * UT date and time of least geocentric approach: 19:27.1 UT
 * approx. V mag of minor planet at event [mag]: 16.4
 * geocentric parallax of minor planet ["]: 3.079
 * magnitude drop [mag]: 5.2
 * estimated maximum duration [s]: 3.1
 * apparent motion of minor planet ["/h]: 36.58
 * angular distance to moon, phase of moon [deg,%]: 125, 14%
 * 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  '  "
   -  8  0  0    45 59  0   19 27 51    61    -4   45 37 40   46 20 25
   -  6  0  0    45 26 39   19 27 59    61    -6   45  5 12   45 48 10
   -  4  0  0    44 52 49   19 28  7    60    -7   44 31 16   45 14 26
   -  2  0  0    44 17 29   19 28 15    59    -9   43 55 50   44 39 13
      0  0  0    43 40 41   19 28 23    59   -10   43 18 55   44  2 30
      2  0  0    43  2 24   19 28 31    58   -12   42 40 32   43 24 20
      4  0  0    42 22 39   19 28 39    57   -13   42  0 41   42 44 41
      6  0  0    41 41 27   19 28 47    56   -15   41 19 24   42  3 35
      8  0  0    40 58 49   19 28 56    54   -17   40 36 40   41 21  3
     10  0  0    40 14 47   19 29  4    53   -18   39 52 33   40 37  7
     12  0  0    39 29 23   19 29 12    52   -20   39  7  4   39 51 48
     14  0  0    38 42 39   19 29 20    51   -22   38 20 14   39  5  8
     16  0  0    37 54 37   19 29 28    49   -24   37 32  8   38 17 11
     18  0  0    37  5 20   19 29 36    48   -26   36 42 47   37 27 58
     20  0  0    36 14 52   19 29 44    46   -27   35 52 15   36 37 34
     22  0  0    35 23 17   19 29 52    45   -29   35  0 37   35 46  2
     24  0  0    34 30 38   19 29 60    43   -31   34  7 55   34 53 27
     26  0  0    33 37  1   19 30  8    41   -33   33 14 16   33 59 52
     28  0  0    32 42 30   19 30 15    39   -35   32 19 43   33  5 23
     30  0  0    31 47 11   19 30 22    38   -37   31 24 22   32 10  5
     32  0  0    30 51  9   19 30 29    36   -39   30 28 19   31 14  4
     34  0  0    29 54 30   19 30 36    34   -41   29 31 40   30 17 26
     36  0  0    28 57 21   19 30 42    32   -43   28 34 31   29 20 16
     38  0  0    27 59 47   19 30 49    30   -45   27 36 58   28 22 42
     40  0  0    27  1 57   19 30 55    28   -46   26 39  8   27 24 50
     42  0  0    26  3 55   19 31  0    26   -48   25 41  8   26 26 47
     44  0  0    25  5 50   19 31  5    24   -50   24 43  5   25 28 40
     46  0  0    24  7 48   19 31 10    22   -52   23 45  6   24 30 35
     48  0  0    23  9 56   19 31 15    20   -54   22 47 18   23 32 40
     50  0  0    22 12 22   19 31 19    18   -56   21 49 47   22 35  2
     52  0  0    21 15 11   19 31 23    16   -58   20 52 40   21 37 47
     54  0  0    20 18 31   19 31 26    14   -59   19 56  4   20 41  3
     56  0  0    19 22 28   19 31 29    12   -61   19  0  6   19 44 56
     58  0  0    18 27  9   19 31 31    10   -63   18  4 52   18 49 31
   ........................... 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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