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ASTROMETRIC UPDATE:
OCCULTATION BY (99) DIKE - 2003 OCT 20

UPDATE: 2003 SEP 20, 23:11 UT

THE UPDATED PATH

(Note: The time given in the line below is for the midpoint of the path as it crosses the Earth - please see the minute markers on the map to determine the approximate the time for your location)

Dike Update Map


On 2003 Oct 20 UT, the 71 km diameter asteroid (99) Dike will occult a 10.3 mag star in the constellation Sagittarius for observers along a path across SE Australia travelling NE passing just east of Melbourne, cutting through the SE corner of Canberra and passing just South of Sydney.

In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 14.3 mag (the magnitude of the asteroid) for at most 2.1 seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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
    125  0  0   -50 39 56   11 36 29    47   268   -12  -51  6 59  -50 13  1  -51  6 59  -50 13  1
    126  0  0   -50 11 20   11 36 31    46   267   -12  -50 38 31  -49 44 18  -50 38 31  -49 44 18
    127  0  0   -49 42  4   11 36 34    46   266   -13  -50  9 23  -49 14 54  -50  9 23  -49 14 54
    128  0  0   -49 12  9   11 36 36    45   264   -14  -49 39 35  -48 44 51  -49 39 35  -48 44 51
    129  0  0   -48 41 33   11 36 38    44   263   -15  -49  9  6  -48 14  7  -49  9  6  -48 14  7

    130  0  0   -48 10 16   11 36 40    44   262   -16  -48 37 57  -47 42 44  -48 37 57  -47 42 44
    131  0  0   -47 38 20   11 36 42    43   261   -17  -48  6  8  -47 10 41  -48  6  8  -47 10 41
    132  0  0   -47  5 44   11 36 45    42   260   -18  -47 33 39  -46 37 58  -47 33 39  -46 37 58
    133  0  0   -46 32 27   11 36 47    41   259   -18  -47  0 29  -46  4 35  -47  0 29  -46  4 35
    134  0  0   -45 58 31   11 36 49    40   258   -19  -46 26 39  -45 30 32  -46 26 39  -45 30 32

    135  0  0   -45 23 55   11 36 51    40   257   -20  -45 52  9  -44 55 50  -45 52  9  -44 55 50
    136  0  0   -44 48 40   11 36 54    39   256   -21  -45 17  0  -44 20 29  -45 17  0  -44 20 29
    137  0  0   -44 12 46   11 36 56    38   255   -22  -44 41 12  -43 44 30  -44 41 12  -43 44 30
    138  0  0   -43 36 14   11 36 58    37   254   -23  -44  4 45  -43  7 53  -44  4 45  -43  7 53
    139  0  0   -42 59  5   11 37  0    36   253   -24  -43 27 40  -42 30 38  -43 27 40  -42 30 38

    140  0  0   -42 21 18   11 37  2    35   252   -25  -42 49 58  -41 52 47  -42 49 58  -41 52 47
    141  0  0   -41 42 55   11 37  4    34   251   -26  -42 11 39  -41 14 19  -42 11 39  -41 14 19
    142  0  0   -41  3 56   11 37  6    33   250   -27  -41 32 45  -40 35 17  -41 32 45  -40 35 17
    143  0  0   -40 24 23   11 37  9    33   249   -28  -40 53 15  -39 55 40  -40 53 15  -39 55 40
    144  0  0   -39 44 16   11 37 11    32   248   -29  -40 13 12  -39 15 31  -40 13 12  -39 15 31

    145  0  0   -39  3 37   11 37 13    31   247   -30  -39 32 36  -38 34 49  -39 32 36  -38 34 49
    146  0  0   -38 22 27   11 37 15    30   246   -31  -38 51 28  -37 53 37  -38 51 28  -37 53 37
    147  0  0   -37 40 47   11 37 17    29   246   -32  -38  9 50  -37 11 55  -38  9 50  -37 11 55
    148  0  0   -36 58 39   11 37 18    28   245   -33  -37 27 43  -36 29 45  -37 27 43  -36 29 45
    149  0  0   -36 16  3   11 37 20    27   244   -34  -36 45  8  -35 47  8  -36 45  8  -35 47  8

    150  0  0   -35 33  2   11 37 22    25   243   -35  -36  2  7  -35  4  6  -36  2  7  -35  4  6
    151  0  0   -34 49 36   11 37 24    24   243   -36  -35 18 42  -34 20 40  -35 18 42  -34 20 40
    152  0  0   -34  5 49   11 37 26    23   242   -37  -34 34 54  -33 36 53  -34 34 54  -33 36 53
    153  0  0   -33 21 41   11 37 27    22   241   -39  -33 50 46  -32 52 46  -33 50 46  -32 52 46
    154  0  0   -32 37 14   11 37 29    21   241   -40  -33  6 18  -32  8 20  -33  6 18  -32  8 20

    155  0  0   -31 52 30   11 37 30    20   240   -41  -32 21 32  -31 23 37  -32 21 32  -31 23 37
    156  0  0   -31  7 31   11 37 32    19   239   -42  -31 36 32  -30 38 41  -31 36 32  -30 38 41
    157  0  0   -30 22 19   11 37 33    18   239   -43  -30 51 17  -29 53 31  -30 51 17  -29 53 31
    158  0  0   -29 36 56   11 37 34    17   238   -44  -30  5 51  -29  8 11  -30  5 51  -29  8 11
    159  0  0   -28 51 24   11 37 36    16   238   -45  -29 20 16  -28 22 41  -29 20 16  -28 22 41

    160  0  0   -28  5 45   11 37 37    14   237   -46  -28 34 33  -27 37  6  -28 34 33  -27 37  6
    161  0  0   -27 20  0   11 37 38    13   237   -47  -27 48 45  -26 51 25  -27 48 45  -26 51 25
    162  0  0   -26 34 13   11 37 39    12   236   -49  -27  2 53  -26  5 42  -27  2 53  -26  5 42
    163  0  0   -25 48 25   11 37 40    11   236   -50  -26 17  1  -25 19 58  -26 17  1  -25 19 58
    164  0  0   -25  2 37   11 37 40    10   235   -51  -25 31  8  -24 34 16  -25 31  8  -24 34 16

    165  0  0   -24 16 53   11 37 41     9   235   -52  -24 45 19  -23 48 37  -24 45 19  -23 48 37
    166  0  0   -23 31 14   11 37 42     7   235   -53  -23 59 35  -23  3  4  -23 59 35  -23  3  4
    167  0  0   -22 45 43   11 37 42     6   234   -54  -23 13 57  -22 17 38  -23 13 57  -22 17 38
    168  0  0   -22  0 20   11 37 43     5   234   -55  -22 28 28  -21 32 21  -22 28 28  -21 32 21
    169  0  0   -21 15  8   11 37 43     4   233   -56  -21 43 10  -20 47 15  -21 43 10  -20 47 15

    170  0  0   -20 30  9   11 37 43     3   233   -57  -20 58  5  -20  2 23  -20 58  5  -20  2 23
    171  0  0   -19 45 25   11 37 43     1   233   -58  -20 13 14  -19 17 45  -20 13 14  -19 17 45
    172  0  0   -19  0 57   11 37 44     0   232   -59  -19 28 39   .. .. ..  -19 28 39   .. .. ..


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