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ASTROMETRIC UPDATE:
OCCULTATION BY (860) URSINA - 2012 APR 02

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2012 Mar 09, 18:35 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.

Ursina Update Map


On 2012 Apr 02 UT, the 34 km diameter asteroid (860) Ursina will occult a 11.2 mag star in the constellation Scorpius for observers along a path across Northern Territory and eastern South Australia, passing over Gawler near Adelaide.

In the case of an occultation, the combined light of the asteroid and the star will drop by 3.9 mag to 15.1 mag (the magnitude of the asteroid) for at most 6.2 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 :
 Occultation of UCAC2 15323166 by 860 Ursina on 2012 Apr  2 
                  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
    133 59 47   -10  0  0   18 15 29    60   166   -43  133 50 20  134  9 14  133 13 51  134 45 42
    134 10 12   -11  0  0   18 15 47    61   166   -43  134  0 43  134 19 41  133 24  8  134 56 16
    134 20 40   -12  0  0   18 16  5    62   166   -43  134 11 10  134 30 11  133 34 26  135  6 54
    134 31 13   -13  0  0   18 16 24    63   166   -42  134 21 40  134 40 46  133 44 48  135 17 37
    134 41 50   -14  0  0   18 16 42    64   166   -42  134 32 15  134 51 25  133 55 14  135 28 27

    134 52 33   -15  0  0   18 17  1    65   166   -42  134 42 55  135  2 11  134  5 44  135 39 22
    135  3 22   -16  0  0   18 17 20    66   166   -41  134 53 41  135 13  3  134 16 19  135 50 25
    135 14 18   -17  0  0   18 17 39    67   165   -41  135  4 34  135 24  2  134 27  0  136  1 36
    135 25 22   -18  0  0   18 17 58    68   165   -40  135 15 35  135 35  9  134 37 48  136 12 56
    135 36 35   -19  0  0   18 18 18    69   165   -40  135 26 44  135 46 25  134 48 44  136 24 26

    135 47 57   -20  0  0   18 18 37    70   165   -40  135 38  2  135 57 52  134 59 48  136 36  7
    135 59 30   -21  0  0   18 18 57    71   165   -39  135 49 31  136  9 29  135 11  2  136 48  0
    136 11 15   -22  0  0   18 19 17    72   165   -39  136  1 12  136 21 17  135 22 26  137  0  5
    136 23 12   -23  0  0   18 19 36    73   165   -38  136 13  4  136 33 19  135 34  1  137 12 25
    136 35 23   -24  0  0   18 19 56    74   165   -38  136 25 10  136 45 35  135 45 48  137 24 59

    136 47 48   -25  0  0   18 20 17    75   164   -37  136 37 31  136 58  6  135 57 49  137 37 50
    137  0 30   -26  0  0   18 20 37    76   164   -37  136 50  7  137 10 53  136 10  5  137 50 58
    137 13 28   -27  0  0   18 20 57    77   164   -36  137  3  0  137 23 57  136 22 36  138  4 24
    137 26 46   -28  0  0   18 21 18    78   164   -36  137 16 11  137 37 20  136 35 24  138 18 11
    137 40 23   -29  0  0   18 21 38    79   164   -35  137 29 42  137 51  4  136 48 30  138 32 19

    137 54 21   -30  0  0   18 21 59    80   163   -35  137 43 33  138  5  9  137  1 56  138 46 51
    138  8 42   -31  0  0   18 22 20    81   163   -34  137 57 47  138 19 37  137 15 42  139  1 46
    138 23 28   -32  0  0   18 22 40    82   163   -34  138 12 26  138 34 30  137 29 52  139 17  9
    138 38 39   -33  0  0   18 23  1    83   163   -33  138 27 29  138 49 50  137 44 25  139 32 59
    138 54 19   -34  0  0   18 23 22    84   162   -33  138 43  1  139  5 38  137 59 25  139 49 20

    139 10 29   -35  0  0   18 23 43    85   162   -32  138 59  2  139 21 56  138 14 52  140  6 12
    139 27 11   -36  0  0   18 24  4    86   161   -31  139 15 35  139 38 48  138 30 49  140 23 40
    139 44 27   -37  0  0   18 24 25    86   159   -31  139 32 41  139 56 14  138 47 19  140 41 44
    140  2 20   -38  0  0   18 24 46    87   156   -30  139 50 24  140 14 17  139  4 22  141  0 27
    140 20 53   -39  0  0   18 25  7    87   116   -30  140  8 46  140 33  1  139 22  2  141 19 53

    140 40  8   -40  0  0   18 25 29    87   351   -29  140 27 49  140 52 27  139 40 21  141 40  5
    141  0  8   -41  0  0   18 25 50    86   346   -28  140 47 37  141 12 39  139 59 23  142  1  4
    141 20 57   -42  0  0   18 26 11    86   344   -28  141  8 13  141 33 41  140 19 10  142 22 56
    141 42 38   -43  0  0   18 26 32    85   343   -27  141 29 40  141 55 36  140 39 45  142 45 44
    142  5 15   -44  0  0   18 26 54    84   343   -26  141 52  3  142 18 27  141  1 13  143  9 31

    142 28 53   -45  0  0   18 27 15    83   342   -26  142 15 26  142 42 20  141 23 37  143 34 24
Uncertainty in time = +/- 12 secs

Prediction of 2012 Mar 10.0


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