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ASTROMETRIC UPDATE:
OCCULTATION BY (4834) THOAS - 2012 Dec 22

[Detailed Finder Charts]


Updated:   2012 NOV 16, 11:01 UT

Event Rank : 33

(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.

Thoas Update Map


On 2012 Dec 22 UT, the 96 km diameter asteroid (4834) Thoas will occult a 11.6 mag star in the constellation Leo Minor for observers along a path across Australia, from Cobram at dawn across western New South Wales (in morning twilight) and central Queensland to Cape York, and across Papua - New Guinea from Daru to Aitape.

In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 16.4 mag (the magnitude of the asteroid) for at most 6.4 seconds.

This update is based on 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
    146  6  7   -38  0  0   18 54 17    11   353     0  146 39 10  145 33  6  148 54 59  143 17 53
    145 56 57   -37  0  0   18 54 18    12   353    -1  146 29 33  145 24 22  148 43 31  143 10 57
    145 48  0   -36  0  0   18 54 20    13   353    -2  146 20 11  145 15 50  148 32 24  143  4  9
    145 39 16   -35  0  0   18 54 21    14   353    -2  146 11  3  145  7 31  148 21 37  142 57 27
    145 30 45   -34  0  0   18 54 23    15   353    -3  146  2  9  144 59 22  148 11  8  142 50 52

    145 22 25   -33  0  0   18 54 25    16   353    -3  145 53 27  144 51 24  148  0 55  142 44 22
    145 14 16   -32  0  0   18 54 27    17   353    -4  145 44 57  144 43 35  147 50 59  142 37 58
    145  6 16   -31  0  0   18 54 29    18   354    -5  145 36 38  144 35 56  147 41 19  142 31 38
    144 58 26   -30  0  0   18 54 32    19   354    -5  145 28 29  144 28 24  147 31 52  142 25 23
    144 50 45   -29  0  0   18 54 34    20   354    -6  145 20 30  144 21  1  147 22 39  142 19 12

    144 43 11   -28  0  0   18 54 37    21   354    -6  145 12 39  144 13 44  147 13 39  142 13  4
    144 35 46   -27  0  0   18 54 39    22   354    -7  145  4 58  144  6 35  147  4 51  142  7  0
    144 28 27   -26  0  0   18 54 42    23   354    -8  144 57 24  143 59 31  146 56 14  142  0 59
    144 21 16   -25  0  0   18 54 45    24   354    -8  144 49 58  143 52 34  146 47 48  141 55  0
    144 14 10   -24  0  0   18 54 48    25   354    -9  144 42 39  143 45 42  146 39 32  141 49  4

    144  7 10   -23  0  0   18 54 51    26   354    -9  144 35 26  143 38 56  146 31 26  141 43 10
    144  0 16   -22  0  0   18 54 55    27   354   -10  144 28 19  143 32 14  146 23 29  141 37 18
    143 53 27   -21  0  0   18 54 58    28   354   -10  144 21 19  143 25 36  146 15 40  141 31 28
    143 46 43   -20  0  0   18 55  2    29   354   -11  144 14 24  143 19  3  146  8  0  141 25 39
    143 40  3   -19  0  0   18 55  5    30   354   -12  144  7 34  143 12 33  146  0 27  141 19 51

    143 33 27   -18  0  0   18 55  9    31   354   -12  144  0 48  143  6  7  145 53  2  141 14  4
    143 26 56   -17  0  0   18 55 13    32   354   -13  143 54  7  142 59 44  145 45 44  141  8 17
    143 20 27   -16  0  0   18 55 17    33   354   -13  143 47 31  142 53 24  145 38 32  141  2 32
    143 14  2   -15  0  0   18 55 21    34   354   -14  143 40 58  142 47  7  145 31 27  140 56 47
    143  7 40   -14  0  0   18 55 25    35   354   -14  143 34 28  142 40 52  145 24 27  140 51  2

    143  1 21   -13  0  0   18 55 29    36   354   -15  143 28  3  142 34 40  145 17 34  140 45 16
    142 55  5   -12  0  0   18 55 34    37   354   -16  143 21 40  142 28 30  145 10 45  140 39 31
    142 48 51   -11  0  0   18 55 38    38   354   -16  143 15 20  142 22 21  145  4  2  140 33 46
    142 42 39   -10  0  0   18 55 43    39   354   -17  143  9  3  142 16 14  144 57 23  140 28  0
    142 36 29   - 9  0  0   18 55 47    40   354   -17  143  2 48  142 10  9  144 50 50  140 22 13

    142 30 20   - 8  0  0   18 55 52    41   354   -18  142 56 36  142  4  5  144 44 20  140 16 26
    142 24 14   - 7  0  0   18 55 57    42   354   -18  142 50 26  141 58  2  144 37 55  140 10 37
    142 18  8   - 6  0  0   18 56  2    43   354   -19  142 44 17  141 52  0  144 31 33  140  4 48
    142 12  4   - 5  0  0   18 56  7    44   354   -19  142 38 11  141 45 58  144 25 16  139 58 57
    142  6  1   - 4  0  0   18 56 12    45   354   -20  142 32  5  141 39 57  144 19  1  139 53  5

    141 59 59   - 3  0  0   18 56 18    46   354   -20  142 26  2  141 33 57  144 12 51  139 47 11
    141 53 58   - 2  0  0   18 56 23    47   354   -21  142 19 59  141 27 57  144  6 43  139 41 16
    141 47 57   - 1  0  0   18 56 28    48   354   -21  142 13 58  141 21 57  144  0 38  139 35 18
    141 41 57     0  0  0   18 56 34    49   354   -22  142  7 57  141 15 57  143 54 37  139 29 19
    141 35 57     1  0  0   18 56 39    50   354   -22  142  1 58  141  9 57  143 48 38  139 23 18

    141 29 58     2  0  0   18 56 45    51   354   -23  141 55 59  141  3 56  143 42 41  139 17 14

Uncertainty in time = +/- 13 secs

Prediction of 2012 Dec  3.0

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