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ASTROMETRIC UPDATE:
OCCULTATION BY (678) FREDEGUNDIS - 2012 JAN 24

[Detailed Finder Charts]


Updated:   2011 Dec 15, 18:19 UT

Event Rank : 74

(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.

Fredegundis Update Map


On 2012 Jan 24 UT, the 42 km diameter asteroid (678) Fredegundis will occult a 11.9 mag star in the constellation Taurus for observers along a path across south-eastern Queensland, beginning near Harvey Bay, running across northern and central New South Wales and western Victoria, leaving near Mount Gambier.

In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.3 mag (the magnitude of the asteroid) for at most 12.0 seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, 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 TYC 1861-01228-1 by 678 Fredegundis on 2012 Jan 24 
                  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
    137  5 46   -45  0  0   13 20 59    20   345   -22  136 35  8  137 36 37  135 48 21  138 24 33
    137 35 57   -44  0  0   13 20 39    21   345   -23  137  5 37  138  6 30  136 19 17  138 53 58
    138  7 47   -43  0  0   13 20 18    22   344   -24  137 37 43  138 38  4  136 51 48  139 25  8
    138 41 16   -42  0  0   13 19 56    23   343   -25  138 11 25  139 11 19  137 25 52  139 58  1
    139 16 22   -41  0  0   13 19 33    24   343   -26  138 46 43  139 46 13  138  1 28  140 32 36

    139 53  5   -40  0  0   13 19  9    25   342   -27  139 23 37  140 22 46  138 38 38  141  8 54
    140 31 26   -39  0  0   13 18 44    26   342   -28  140  2  7  141  0 59  139 17 21  141 46 54
    141 11 26   -38  0  0   13 18 19    26   341   -29  140 42 13  141 40 52  139 57 38  142 26 37
    141 53  5   -37  0  0   13 17 52    27   340   -30  141 23 57  142 22 26  140 39 30  143  8  4
    142 36 25   -36  0  0   13 17 24    28   339   -31  142  7 20  143  5 43  141 22 58  143 51 18

    143 21 28   -35  0  0   13 16 55    29   338   -33  142 52 24  143 50 45  142  8  4  144 36 19
    144  8 16   -34  0  0   13 16 25    29   338   -34  143 39 11  144 37 34  142 54 51  145 23 10
    144 56 52   -33  0  0   13 15 55    30   337   -35  144 27 45  145 26 13  143 43 21  146 11 54
    145 47 19   -32  0  0   13 15 23    31   336   -36  145 18  7  146 16 45  144 33 37  147  2 35
    146 39 41   -31  0  0   13 14 50    31   335   -37  146 10 23  147  9 15  145 25 42  147 55 17

    147 34  3   -30  0  0   13 14 16    32   334   -38  147  4 35  148  3 46  146 19 42  148 50  4
    148 30 29   -29  0  0   13 13 41    33   333   -39  148  0 50  149  0 25  147 15 40  149 47  3
    149 29  7   -28  0  0   13 13  5    33   332   -41  148 59 13  149 59 17  148 13 43  150 46 20
    150 30  2   -27  0  0   13 12 27    34   330   -42  149 59 51  151  0 30  149 13 56  151 48  2
    151 33 22   -26  0  0   13 11 49    34   329   -43  151  2 51  152  4 12  150 16 26  152 52 19

    152 39 17   -25  0  0   13 11  9    35   328   -44  152  8 22  153 10 32  151 21 23  153 59 20
    153 47 58   -24  0  0   13 10 28    35   327   -45  153 16 36  154 19 42  152 28 56  155  9 17
    154 59 37   -23  0  0   13  9 45    35   325   -47  154 27 42  155 31 55  153 39 16  156 22 26
    156 14 29   -22  0  0   13  9  1    35   324   -48  155 41 57  156 47 26  154 52 36  157 39  2
Uncertainty in time = +/- 10 secs

Prediction of 2011 Dec 16.0


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