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ASTROMETRIC UPDATE:
OCCULTATION BY (152) ATALA - 2009 Dec 14

[Detailed Finder Charts]


Updated:   2009 NOV 14, 20:50 UT

Event Rank : 98

(The event Rank is a measure of the likelihood of observing an event, and is equal to the probability of at least one successful observation by a team of two observers spaced 1/8 path width just inside opposite sides of the predicted path. An event rank of 100 indicates that the prediction is expected to be very accurate).


THE UPDATED PATH

Note: The duration given in the line below is the interval during which the occultation shadow sweeps across the Earth - please see the minute markers on the map to determine the approximate time for your location.

Atala Update Map


On 2009 Dec 14 UT, the 123 km diameter asteroid (152) Atala will occult a 12.9 mag star in the constellation Auriga for observers along a path across Western Australia from Onslow to Eucla.

In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 12.5 mag (the magnitude of the asteroid) for at most 9.7 seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC.

Additional details of this and other events are available at Steve Preston's website at http://www.asteroidoccultation.com/

EVENT DETAILS SUMMARY : Data for the target star : Data for the minor planet : The Occultation Path :
                   Centre              Star  Star   Sun      Path Limits           Error Limits
  E. Longitude   Latitude      U.T.    Alt    Az   Alt    Limit 1    Limit 2    Limit 3    Limit 4
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "
                                                        Longitude  Longitude  Longitude  Longitude
    142 14  1   -42  0  0   17 27  2     1   321   -13  143 41 52  140 44 55  ... .. ..  139 39 54
    141  7 52   -41  0  0   17 27  2     2   322   -14  142 35 20  139 39  6  ... .. ..  138 34 18
    140  0 52   -40  0  0   17 27  3     3   323   -15  141 28  3  138 32 19  ... .. ..  137 27 39
    138 52 54   -39  0  0   17 27  4     5   324   -17  140 19 55  137 24 28  141 21 45  136 19 51
    137 43 52   -38  0  0   17 27  6     6   324   -18  139 10 49  136 15 27  140 12 35  135 10 48

    136 33 42   -37  0  0   17 27  8     7   325   -19  138  0 41  135  5 10  139  2 26  134  0 24
    135 22 14   -36  0  0   17 27 10     9   326   -21  136 49 23  133 53 29  137 51 12  132 48 31
    134  9 24   -35  0  0   17 27 13    10   327   -22  135 36 48  132 40 18  136 38 46  131 35  0
    132 55  1   -34  0  0   17 27 17    11   327   -23  134 22 50  131 25 26  135 25  2  130 19 44
    131 38 59   -33  0  0   17 27 21    13   328   -25  133  7 19  130  8 45  134  9 50  129  2 32

    130 21  6   -32  0  0   17 27 25    14   329   -26  131 50  7  128 50  5  132 53  4  127 43 12
    129  1 13   -31  0  0   17 27 30    16   330   -28  130 31  3  127 29 14  131 34 32  126 21 34
    127 39  7   -30  0  0   17 27 36    17   330   -29  129  9 58  126  5 58  130 14  5  124 57 22
    126 14 35   -29  0  0   17 27 43    19   331   -31  127 46 38  124 40  3  128 51 31  123 30 20
    124 47 20   -28  0  0   17 27 50    20   332   -32  126 20 49  123 11 11  127 26 38  122  0  8

    123 17  6   -27  0  0   17 27 57    22   333   -34  124 52 16  121 39  2  125 59  9  120 26 25
    121 43 31   -26  0  0   17 28  6    23   334   -35  123 20 39  120  3 11  124 28 48  118 48 43
    120  6  9   -25  0  0   17 28 15    25   335   -37  121 45 37  118 23  9  122 55 15  117  6 31
    118 24 31   -24  0  0   17 28 25    26   336   -38  120  6 43  116 38 21  121 18  6  115 19  7
    116 38  0   -23  0  0   17 28 37    28   338   -40  118 23 26  114 48  3  119 36 53  113 25 40

    114 45 50   -22  0  0   17 28 49    29   339   -41  116 35  9  112 51 19  117 51  2  111 25  6
    112 47  2   -21  0  0   17 29  2    31   340   -43  114 41  1  110 46 54  115 59 51  109 15 56
    110 40 18   -20  0  0   17 29 17    32   342   -45  112 40  3  108 33 11  114  2 25  106 56  9
                                                         Latitude   Latitude   Latitude   Latitude
    109  0  0   -19 15 26   17 29 30    33   343   -46  -18 20 19  -20 11 40  -17 41 18  -20 52 54

Uncertainty in time = +/- 7 secs

Prediction of 2009 Nov 15.0

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