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ASTROMETRIC UPDATE:
OCCULTATION BY (24) THEMIS - 2009 APR 20

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2009 APR 15, 19:18 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.

Themis Update Map


On 2009 Apr 20 UT, the 161 km diameter asteroid (24) Themis will occult a 12.6 mag star in the constellation Libra for observers along a wide path across New Zealand, passing over Invercargill and Dunedin, then at low elevation across eastern Victoria.

In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.3 mag to 11.5 mag (the magnitude of the asteroid) for at most 14.9 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  '  "
                                                         Latitude   Latitude   Latitude   Latitude
    141  0  0   -34 19 47    9 13 52     3   110   -14  -33  8 31  -35 32 59   .. .. ..  -36 19 24
    142  0  0   -34 41  0    9 13 51     4   109   -15  -33 29 30  -35 54 26   .. .. ..  -36 41  2
    143  0  0   -35  2 36    9 13 50     5   108   -16  -33 50 51  -36 16 17  -33  7 16  -37  3  3
    144  0  0   -35 24 34    9 13 49     5   108   -17  -34 12 35  -36 38 31  -33 28 52  -37 25 27
    145  0  0   -35 46 53    9 13 47     6   107   -18  -34 34 40  -37  1  6  -33 50 49  -37 48 13

    146  0  0   -36  9 34    9 13 46     7   107   -19  -34 57  6  -37 24  3  -34 13  6  -38 11 20
    147  0  0   -36 32 35    9 13 44     8   106   -19  -35 19 53  -37 47 20  -34 35 44  -38 34 48
    148  0  0   -36 55 56    9 13 42     9   105   -20  -35 42 59  -38 10 57  -34 58 42  -38 58 36
    149  0  0   -37 19 36    9 13 39    10   105   -21  -36  6 24  -38 34 54  -35 21 58  -39 22 43
    150  0  0   -37 43 34    9 13 37    11   104   -22  -36 30  7  -38 59  8  -35 45 32  -39 47  9

    151  0  0   -38  7 50    9 13 34    12   104   -23  -36 54  8  -39 23 41  -36  9 24  -40 11 53
    152  0  0   -38 32 23    9 13 31    12   103   -23  -37 18 25  -39 48 31  -36 33 33  -40 36 54
    153  0  0   -38 57 12    9 13 28    13   102   -24  -37 42 59  -40 13 36  -36 57 58  -41  2 11
    154  0  0   -39 22 17    9 13 25    14   102   -25  -38  7 48  -40 38 58  -37 22 38  -41 27 43
    155  0  0   -39 47 36    9 13 21    15   101   -25  -38 32 51  -41  4 34  -37 47 33  -41 53 31

    156  0  0   -40 13  8    9 13 18    16   100   -26  -38 58  9  -41 30 23  -38 12 41  -42 19 32
    157  0  0   -40 38 54    9 13 14    17    99   -27  -39 23 39  -41 56 26  -38 38  3  -42 45 46
    158  0  0   -41  4 52    9 13 10    17    99   -28  -39 49 22  -42 22 41  -39  3 36  -43 12 12
    159  0  0   -41 31  2    9 13  6    18    98   -28  -40 15 16  -42 49  7  -39 29 22  -43 38 50
    160  0  0   -41 57 21    9 13  1    19    97   -29  -40 41 21  -43 15 44  -39 55 18  -44  5 38

    161  0  0   -42 23 51    9 12 57    20    96   -29  -41  7 35  -43 42 30  -40 21 23  -44 32 35
    162  0  0   -42 50 29    9 12 52    20    96   -30  -41 33 58  -44  9 25  -40 47 38  -44 59 41
    163  0  0   -43 17 16    9 12 48    21    95   -31  -42  0 30  -44 36 27  -41 14  1  -45 26 55
    164  0  0   -43 44  9    9 12 43    22    94   -31  -42 27  9  -45  3 37  -41 40 31  -45 54 15
    165  0  0   -44 11  9    9 12 38    23    93   -32  -42 53 54  -45 30 53  -42  7  8  -46 21 42

    166  0  0   -44 38 14    9 12 32    23    92   -32  -43 20 44  -45 58 13  -42 33 51  -46 49 13
    167  0  0   -45  5 23    9 12 27    24    91   -33  -43 47 40  -46 25 38  -43  0 38  -47 16 48
    168  0  0   -45 32 36    9 12 22    25    91   -33  -44 14 39  -46 53  6  -43 27 29  -47 44 27
    169  0  0   -45 59 51    9 12 16    25    90   -34  -44 41 41  -47 20 37  -43 54 24  -48 12  7
    170  0  0   -46 27  9    9 12 10    26    89   -34  -45  8 45  -47 48  9  -44 21 20  -48 39 49

    171  0  0   -46 54 27    9 12  5    27    88   -35  -45 35 51  -48 15 41  -44 48 18  -49  7 31
    172  0  0   -47 21 45    9 11 59    27    87   -35  -46  2 56  -48 43 13  -45 15 17  -49 35 13
Uncertainty in time = +/- 5 secs

Prediction of 2009 Apr 16.0

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