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ASTROMETRIC UPDATE:
OCCULTATION BY (198) AMPELLA - 2011 Nov 03

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2011 OCT 13, 17:17 UT

Event Rank : 87

(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.

Ampella Update Map


On 2011 Nov 03 UT, the 61 km diameter asteroid (198) Ampella will occult a 12.2 mag star in the constellation Taurus for observers along a path across central Australia in morning twilight and passing near Eucla in Western Australia.

In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 11.7 mag (the magnitude of the asteroid) for at most 19.2 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 :
                   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
    122  3 26   -41  0  0   19 48  5    20   348    -9  121 20 15  122 47  5  120 31 33  123 37 26
    122 36 11   -40  0  0   19 47 43    21   348    -9  121 53 15  123 19 33  121  4 52  124  9 36
    123 10 38   -39  0  0   19 47 20    22   347    -9  122 27 56  123 53 47  121 39 49  124 43 34
    123 46 48   -38  0  0   19 46 56    22   346   -10  123  4 18  124 29 47  122 16 23  125 19 22
    124 24 43   -37  0  0   19 46 30    23   346   -10  123 42 21  125  7 33  122 54 36  125 56 59

    125  4 21   -36  0  0   19 46  4    24   345   -10  124 22  5  125 47  6  123 34 27  126 36 26
    125 45 46   -35  0  0   19 45 36    25   345   -10  125  3 33  126 28 28  124 16  0  127 17 45
    126 28 59   -34  0  0   19 45  7    26   344   -10  125 46 46  127 11 40  124 59 14  128  0 58
    127 14  1   -33  0  0   19 44 37    27   343   -10  126 31 47  127 56 46  125 44 13  128 46  8
    128  0 57   -32  0  0   19 44  5    27   342   -10  127 18 37  128 43 47  126 30 58  129 33 17

    128 49 48   -31  0  0   19 43 33    28   342   -10  128  7 21  129 32 47  127 19 33  130 22 28
    129 40 39   -30  0  0   19 42 59    29   341    -9  128 58  1  130 23 51  128 10  2  131 13 47
    130 33 35   -29  0  0   19 42 23    30   340    -9  129 50 42  131 17  2  129  2 28  132  7 18
    131 28 40   -28  0  0   19 41 47    30   339    -9  130 45 29  132 12 27  129 56 57  133  3  6
    132 26  1   -27  0  0   19 41  9    31   338    -9  131 42 28  133 10 11  130 53 32  134  1 19

    133 25 44   -26  0  0   19 40 30    32   337    -8  132 41 46  134 10 22  131 52 22  135  2  5
    134 27 58   -25  0  0   19 39 49    32   336    -8  133 43 29  135 13  9  132 53 33  136  5 32
    135 32 52   -24  0  0   19 39  7    33   335    -8  134 47 47  136 18 41  133 57 13  137 11 51
    136 40 37   -23  0  0   19 38 23    33   334    -7  135 54 50  137 27 11  135  3 31  138 21 15
    137 51 26   -22  0  0   19 37 37    34   332    -7  137  4 50  138 38 51  136 12 40  139 33 59

    139  5 33   -21  0  0   19 36 50    34   331    -6  138 18  1  139 53 58  137 24 52  140 50 20
    140 23 16   -20  0  0   19 36  1    35   330    -5  139 34 40  141 12 51  138 40 22  142 10 40
    141 44 58   -19  0  0   19 35 10    35   328    -5  140 55  6  142 35 54  139 59 28  143 35 24
    143 11  3   -18  0  0   19 34 17    35   327    -4  142 19 43  144  3 36  141 22 32  145  5  4
    144 42  5   -17  0  0   19 33 22    35   325    -3  143 49  0  145 36 31  142 50  1  146 40 21

Uncertainty in time = +/- 11 secs

Prediction of 2011 Oct 14.0

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