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ASTROMETRIC UPDATE:
OCCULTATION BY (702) ALAUDA - 2008 Nov 11

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2008 OCT 30, 14:31 UT

Event Rank : 99

(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.

Alauda Update Map


On 2008 Nov 11 UT, the 195 km diameter asteroid (702) Alauda will occult a 12.0 mag star in the constellation Andromeda for observers along a very broad path across Australia from Townsville (from Ingham to Bowen) in Queensland across western New South Wales to Portland in Victoria, including from Warnambool to Kingston SE in South Australia.

In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.2 mag (the magnitude of the asteroid) for at most 14.5 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 :
                   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
    142 10 13   -46  0  0   13 44  9     4   345   -26  139 55 48  144 30 49  139  8 45  145 23 10
    141 57 17   -45  0  0   13 44  8     5   345   -27  139 45 42  144 14 46  138 59 36  145  5 54

    141 47  3   -44  0  0   13 44  7     6   345   -28  139 38  2  144  1 42  138 52 48  144 51 43
    141 39 21   -43  0  0   13 44  5     7   345   -29  139 32 40  143 51 24  138 48 14  144 40 25
    141 34  0   -42  0  0   13 44  3     8   345   -30  139 29 29  143 43 42  138 45 47  144 31 50
    141 30 55   -41  0  0   13 44  1     9   345   -31  139 28 22  143 38 29  138 45 20  144 25 47
    141 29 59   -40  0  0   13 43 59    10   345   -32  139 29 13  143 35 36  138 46 48  144 22  9

    141 31  6   -39  0  0   13 43 56    11   345   -33  139 31 58  143 34 56  138 50  7  144 20 49
    141 34 10   -38  0  0   13 43 53    12   345   -34  139 36 32  143 36 24  138 55 11  144 21 41
    141 39  8   -37  0  0   13 43 50    13   345   -35  139 42 51  143 39 56  139  1 58  144 24 39
    141 45 56   -36  0  0   13 43 47    14   345   -36  139 50 51  143 45 26  139 10 24  144 29 40
    141 54 31   -35  0  0   13 43 43    15   345   -37  140  0 31  143 52 51  139 20 26  144 36 39

    142  4 49   -34  0  0   13 43 39    16   344   -38  140 11 47  144  2  8  139 32  3  144 45 33
    142 16 49   -33  0  0   13 43 35    17   344   -39  140 24 38  144 13 15  139 45 12  144 56 20
    142 30 28   -32  0  0   13 43 31    17   344   -40  140 39  2  144 26  8  139 59 51  145  8 56
    142 45 46   -31  0  0   13 43 26    18   344   -41  140 54 58  144 40 48  140 16  1  145 23 22
    143  2 42   -30  0  0   13 43 22    19   343   -42  141 12 25  144 57 12  140 33 38  145 39 34

    143 21 14   -29  0  0   13 43 17    20   343   -43  141 31 22  145 15 20  140 52 45  145 57 34
    143 41 23   -28  0  0   13 43 11    21   343   -44  141 51 49  145 35 11  141 13 19  146 17 20
    144  3  8   -27  0  0   13 43  6    22   342   -45  142 13 46  145 56 47  141 35 21  146 38 52
    144 26 30   -26  0  0   13 43  0    23   342   -46  142 37 14  146 20  6  141 58 52  147  2 11
    144 51 30   -25  0  0   13 42 54    24   341   -47  143  2 14  146 45 11  142 23 51  147 27 19

    145 18 10   -24  0  0   13 42 48    24   341   -48  143 28 46  147 12  3  142 50 22  147 54 17
    145 46 31   -23  0  0   13 42 41    25   340   -49  143 56 52  147 40 44  143 18 24  148 23  6
    146 16 34   -22  0  0   13 42 34    26   340   -50  144 26 34  148 11 16  143 47 59  148 53 51
    146 48 24   -21  0  0   13 42 27    27   339   -51  144 57 54  148 43 42  144 19 11  149 26 33
    147 22  2   -20  0  0   13 42 20    28   339   -52  145 30 56  149 18  7  144 52  0  150  1 17

    147 57 34   -19  0  0   13 42 12    28   338   -53  146  5 41  149 54 35  145 26 31  150 38  9
    148 35  2   -18  0  0   13 42  4    29   337   -54  146 42 14  150 33 11  146  2 47  151 17 12

Uncertainty in time = +/- 3 secs

[Prediction of 2008 Oct 30.0]

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