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ASTROMETRIC UPDATE:
OCCULTATION BY (897) LYSISTRATA - 2008 Dec 01

[Detailed Finder Charts]


Updated:   2008 OCT 20, 22:43 UT

Event Rank : 34

(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.

Lysistrata Update Map


On 2008 Dec 01 UT, the 22 km diameter asteroid (897) Lysistrata will occult a 10.0 mag star in the constellation Aries for observers along a path beginning over far north Queensland passing just north of Cooktown. Moving south-west the path passes through the Northern Territory near Tennant Creek. Then into Western Australia passing near Kalgoorlie before ending near Albany.

In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 14.3 mag (the magnitude of the asteroid) for at most 1.7 seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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
    113  3 49   -43  0  0   16  8 32    19   342   -25  112 47 16  113 20 28  111 44  5  114 25 30
    113 31  8   -42  0  0   16  8 26    20   342   -26  113 14 42  113 47 39  112 12  1  114 52 11
    114  0 19   -41  0  0   16  8 20    21   341   -27  113 44  0  114 16 44  112 41 43  115 20 52
    114 31 23   -40  0  0   16  8 14    22   340   -28  114 15  8  114 47 42  113 13 12  115 51 31
    115  4 19   -39  0  0   16  8  7    23   340   -29  114 48  8  115 20 34  113 46 27  116 24  9

    115 39  8   -38  0  0   16  8  0    23   339   -30  115 23  0  115 55 21  114 21 30  116 58 46
    116 15 51   -37  0  0   16  7 52    24   338   -31  115 59 45  116 32  3  114 58 21  117 35 24
    116 54 31   -36  0  0   16  7 44    25   338   -32  116 38 25  117 10 43  115 37  2  118 14  5
    117 35 10   -35  0  0   16  7 36    26   337   -33  117 19  2  117 51 23  116 17 36  118 54 53
    118 17 51   -34  0  0   16  7 28    26   336   -34  118  1 41  118 34  7  117  0  5  119 37 49

    119  2 39   -33  0  0   16  7 19    27   335   -35  118 46 24  119 18 59  117 44 34  120 23  0
    119 49 38   -32  0  0   16  7 10    28   334   -36  119 33 18  120  6  4  118 31  7  121 10 30
    120 38 54   -31  0  0   16  7  1    28   333   -37  120 22 27  120 55 29  119 19 49  122  0 27
    121 30 35   -30  0  0   16  6 51    29   332   -38  121 13 58  121 47 19  120 10 47  122 52 58
    122 24 49   -29  0  0   16  6 41    29   331   -39  122  8  0  122 41 44  121  4  8  123 48 13

    123 21 45   -28  0  0   16  6 30    30   330   -40  123  4 42  123 38 55  122  0  1  124 46 23
    124 21 35   -27  0  0   16  6 19    30   329   -40  124  4 16  124 39  3  122 58 35  125 47 42
    125 24 35   -26  0  0   16  6  8    31   328   -41  125  6 56  125 42 22  124  0  5  126 52 27
    126 31  0   -25  0  0   16  5 56    31   327   -42  126 12 58  126 49 11  125  4 43  128  0 56
    127 41 11   -24  0  0   16  5 43    31   325   -43  127 22 42  127 59 51  126 12 49  129 13 36

    128 55 34   -23  0  0   16  5 31    31   324   -43  128 36 32  129 14 48  127 24 42  130 30 56
    130 14 41   -22  0  0   16  5 17    32   322   -44  129 54 59  130 34 36  128 40 50  131 53 36
    131 39 11   -21  0  0   16  5  3    32   321   -45  131 18 42  131 59 55  130  1 45  133 22 27
    133  9 58   -20  0  0   16  4 48    31   319   -45  132 48 30  133 31 43  131 28  9  134 58 37
    134 48 11   -19  0  0   16  4 33    31   318   -45  134 25 30  135 11 12  133  0 56  136 43 40

    136 35 28   -18  0  0   16  4 16    31   316   -45  136 11 14  137  0  9  134 41 20  138 39 57
    138 34 15   -17  0  0   16  3 59    30   314   -45  138  7 56  139  1  9  136 31  3  140 51  4
    140 48 19   -16  0  0   16  3 39    29   313   -45  140 19  4  141 18 22  138 32 36  143 23 23
                                                         Latitude   Latitude   Latitude   Latitude
    141  0  0   -15 55  9   16  3 38    29   312   -45  -15 42 49  -16  7 33  -14 55 57  -16 56 12
    142  0  0   -15 31  9   16  3 30    29   312   -45  -15 18 57  -15 43 26  -14 32 31  -16 31 35

    143  0  0   -15  8 41   16  3 21    28   311   -45  -14 56 35  -15 20 51  -14 10 34  -16  8 33
    144  0  0   -14 47 43   16  3 14    28   310   -45  -14 35 44  -14 59 47  -13 50  5  -15 47  5
    145  0  0   -14 28 15   16  3  6    27   310   -44  -14 16 20  -14 40 13  -13 31  2  -15 27  8
    146  0  0   -14 10 14   16  2 58    27   309   -44  -13 58 24  -14 22  7  -13 13 24  -15  8 41
    147  0  0   -13 53 39   16  2 51    26   308   -43  -13 41 55  -14  5 28  -12 57 11  -14 51 44


Uncertainty in time = +/- 3 secs

[Prediction of 2008 Oct 20.0]

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