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ASTROMETRIC UPDATE:
OCCULTATION BY (1803) ZWICKY - 2007 AUG 22

[Detailed Finder Charts]


Updated:   2007 JUL 21, 21:39 UT

Event Rank : 17

(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.

Zwicky Update Map


On 2007 Aug 22 UT, the 13 km diameter asteroid (1803) Zwicky will occult a 10.4 mag star in the constellation Ara for observers along a path beginning near Streaky Bay in South Australia. Moving north-easterly the path then moves into Queensland passing near Julia Creek and ending near Cooktown.

In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.5 mag (the magnitude of the asteroid) for at most 0.7 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
    163 22 10     9  0  0   13  3 44     1   223   -69  163 27 17  163 17  2  164  7 12  ... .. ..
    162 27 12     8  0  0   13  3 44     2   223   -70  162 32 15  162 22  8  163 11 41  ... .. ..
    161 33 31     7  0  0   13  3 43     4   223   -71  161 38 32  161 28 32  162 17 30  160 49 52
    160 41  4     6  0  0   13  3 43     5   223   -72  160 46  1  160 36  7  161 24 33  159 57 52
    159 49 43     5  0  0   13  3 42     6   223   -73  159 54 37  159 44 49  160 32 47  159  6 57

    158 59 26     4  0  0   13  3 41     7   222   -73  159  4 18  158 54 35  159 42  6  158 17  3
    158 10  9     3  0  0   13  3 40     9   222   -74  158 14 58  158  5 20  158 52 27  157 28  6
    157 21 47     2  0  0   13  3 38    10   222   -74  157 26 34  157 17  0  158  3 45  156 40  3
    156 34 17     1  0  0   13  3 37    11   222   -75  156 39  2  156 29 32  157 15 57  155 52 51
    155 47 36     0  0  0   13  3 35    13   222   -75  155 52 19  155 42 53  156 28 59  155  6 26

    155  1 40   - 1  0  0   13  3 34    14   222   -75  155  6 21  154 56 59  155 42 49  154 20 44

                                                         Latitude   Latitude   Latitude   Latitude
    154  0  0   - 2 22  4   13  3 31    16   223   -76  - 2 28 19  - 2 15 49  - 3 17  7  - 1 27 32
    153  0  0   - 3 43 30   13  3 28    17   223   -76  - 3 49 50  - 3 37 10  - 4 39 16  - 2 48 15
    152  0  0   - 5  6 27   13  3 24    19   223   -76  - 5 12 52  - 5  0  2  - 6  2 57  - 4 10 30
    151  0  0   - 6 30 50   13  3 21    21   223   -75  - 6 37 20  - 6 24 20  - 7 28  4  - 5 34 11
    150  0  0   - 7 56 35   13  3 17    22   223   -75  - 8  3 10  - 7 50  1  - 8 54 33  - 6 59 14

    149  0  0   - 9 23 37   13  3 12    24   223   -74  - 9 30 17  - 9 16 58  -10 22 17  - 8 25 34
    148  0  0   -10 51 49   13  3  7    26   224   -73  -10 58 33  -10 45  5  -11 51 11  - 9 53  5
    147  0  0   -12 21  4   13  3  2    28   224   -72  -12 27 53  -12 14 15  -13 21  6  -11 21 40
    146  0  0   -13 51 14   13  2 57    29   224   -71  -13 58  8  -13 44 21  -14 51 57  -12 51 13
    145  0  0   -15 22 12   13  2 51    31   225   -70  -15 29 10  -15 15 15  -16 23 32  -14 21 34

    144  0  0   -16 53 48   13  2 45    33   225   -69  -17  0 50  -16 46 47  -17 55 45  -15 52 35
    143  0  0   -18 25 54   13  2 39    35   226   -68  -18 32 59  -18 18 48  -19 28 24  -17 24  7
    142  0  0   -19 58 18   13  2 32    36   227   -66  -20  5 27  -19 51  9  -21  1 20  -18 56  0
    141  0  0   -21 30 50   13  2 25    38   227   -65  -21 38  3  -21 23 38  -22 34 22  -20 28  4
    140  0  0   -23  3 20   13  2 18    40   228   -64  -23 10 36  -22 56  5  -24  7 18  -22  0  9

    139  0  0   -24 35 37   13  2 10    42   229   -62  -24 42 55  -24 28 19  -25 39 58  -23 32  3
    138  0  0   -26  7 29   13  2  3    43   230   -61  -26 14 49  -26  0  9  -27 12  9  -25  3 36
    137  0  0   -27 38 45   13  1 55    45   231   -59  -27 46  8  -27 31 24  -28 43 42  -26 34 37
    136  0  0   -29  9 15   13  1 47    47   232   -58  -29 16 39  -29  1 52  -30 14 23  -28  4 54
    135  0  0   -30 38 47   13  1 39    48   233   -56  -30 46 12  -30 31 23  -31 44  4  -29 34 18

    134  0  0   -32  7 11   13  1 30    50   235   -55  -32 14 36  -31 59 47  -33 12 33  -31  2 38
    133  0  0   -33 34 18   13  1 22    51   236   -53  -33 41 43  -33 26 53  -34 39 40  -32 29 44
    132  0  0   -34 59 58   13  1 14    53   238   -52  -35  7 23  -34 52 34  -36  5 17  -33 55 27
    131  0  0   -36 24  3   13  1  5    54   239   -50  -36 31 27  -36 16 39  -37 29 14  -35 19 39
    130  0  0   -37 46 25   13  0 57    56   241   -49  -37 53 48  -37 39  3  -38 51 25  -36 42 12

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