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ASTROMETRIC UPDATE:
OCCULTATION BY (987) WALLIA - 2006 SEP 12

[Detailed Finder Charts]


Updated:   2006 AUG 09, 00:46 UT

Event Rank : 67

(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.

Wallia Update Map


On 2006 Sep 12 UT, the 44 km diameter asteroid (987) Wallia will occult a 10.2 mag star in the constellation Perseus for observers along a path across South Australia and Queensland, from Ceduna to Cairns.

In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 14.4 mag (the magnitude of the asteroid) for at most 4.3 seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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
    130 56 21   -36  0  0   19 24 24    22     9   -24  131 18 51  130 33 55  131 59  7  129 54 10
    131 38 35   -35  0  0   19 24 30    23     9   -24  132  0 58  131 16 18  132 40 58  130 36 49
    132 21 20   -34  0  0   19 24 37    24     8   -23  132 43 35  131 59 10  133 23 23  131 19 54
    133  4 38   -33  0  0   19 24 44    25     7   -23  133 26 46  132 42 34  134  6 23  132  3 29
    133 48 30   -32  0  0   19 24 52    26     7   -22  134 10 33  133 26 31  134 50  1  132 47 36

    134 32 59   -31  0  0   19 25  0    27     6   -22  134 54 58  134 11  5  135 34 19  133 32 18
    135 18  7   -30  0  0   19 25  8    28     5   -21  135 40  4  134 56 16  136 19 20  134 17 35
    136  3 58   -29  0  0   19 25 16    29     5   -21  136 25 53  135 42  9  137  5  6  135  3 32
    136 50 34   -28  0  0   19 25 25    30     4   -20  137 12 28  136 28 46  137 51 40  135 50 11
    137 37 58   -27  0  0   19 25 34    31     3   -20  137 59 52  137 16 10  138 39  5  136 37 35

    138 26 13   -26  0  0   19 25 44    32     2   -19  138 48  9  138  4 24  139 27 25  137 25 47
    139 15 23   -25  0  0   19 25 54    33     1   -18  139 37 21  138 53 31  140 16 43  138 14 51
    140  5 32   -24  0  0   19 26  4    34     0   -18  140 27 34  139 43 36  141  7  4  139  4 49
    140 56 43   -23  0  0   19 26 15    35   360   -17  141 18 51  140 34 42  141 58 31  139 55 47
    141 49  1   -22  0  0   19 26 26    36   359   -16  142 11 16  141 26 54  142 51  9  140 47 48

    142 42 32   -21  0  0   19 26 38    37   358   -15  143  4 54  142 20 16  143 45  3  141 40 57
    143 37 19   -20  0  0   19 26 50    38   356   -14  143 59 52  143 14 55  144 40 20  142 35 19
    144 33 30   -19  0  0   19 27  2    39   355   -13  144 56 15  144 10 54  145 37  4  143 30 59
    145 31 11   -18  0  0   19 27 15    40   354   -12  145 54  9  145  8 21  146 35 24  144 28  4
    146 30 28   -17  0  0   19 27 29    41   353   -11  146 53 42  146  7 24  147 35 27  145 26 41

    147 31 31   -16  0  0   19 27 42    42   352   -10  147 55  3  147  8  9  148 37 22  146 26 56
    148 34 28   -15  0  0   19 27 57    43   350    -9  148 58 21  148 10 45  149 41 18  147 28 59
    149 39 29   -14  0  0   19 28 12    43   349    -8  150  3 46  149 15 24  150 47 27  148 32 58
    150 46 47   -13  0  0   19 28 27    44   347    -7  151 11 31  150 22 15  151 56  3  149 39  5
    151 56 35   -12  0  0   19 28 43    45   345    -6  152 21 49  151 31 33  153  7 20  150 47 32

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