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ASTROMETRIC UPDATE:
OCCULTATION BY (61) DANAE - 2009 Sep 02

[Detailed Finder Charts]


Updated:   2009 AUG 20, 18:09 UT

Event Rank : 49

(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.

Danae Update Map


On 2009 Sep 02 UT, the 77 km diameter asteroid (61) Danae will occult a 13.3 mag star in the constellation Scorpius for observers along a path across Australia, from Princess Charlotte Bay across western Queensland and central South Australia Ceduna, and across New Guinea near Lae.

In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 12.5 mag (the magnitude of the asteroid) for at most 6.1 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
    152 21 30     3  0  0   11 30  7    35   216   -53  152 45 37  151 57 25  153 49 29  150 54  2
    151 48 49     2  0  0   11 30  1    36   216   -53  152 12 51  151 24 49  153 16 31  150 21 37

    151 16 28     1  0  0   11 29 55    37   216   -53  151 40 26  150 52 31  152 43 55  149 49 28
    150 44 24     0  0  0   11 29 49    38   216   -53  151  8 20  150 20 31  152 11 40  149 17 36
    150 12 38   - 1  0  0   11 29 42    40   216   -52  150 36 31  149 48 47  151 39 44  148 45 58
                                                         Latitude   Latitude   Latitude   Latitude
    149  0  0   - 3 18 53   11 29 27    42   217   -51  - 4  4 52  - 2 33  7  - 6  7 29  - 0 33 19
    148  0  0   - 5 15  9   11 29 13    44   217   -51  - 6  1 38  - 4 28 55  - 8  5 31  - 2 27 54

    147  0  0   - 7 12 32   11 28 59    46   218   -50  - 7 59 26  - 6 25 52  -10  4 27  - 4 23 45
    146  0  0   - 9 10 41   11 28 45    49   218   -49  - 9 57 57  - 8 23 39  -12  3 57  - 6 20 34
    145  0  0   -11  9 16   11 28 30    51   219   -48  -11 56 51  -10 21 56  -14  3 40  - 8 18  2
    144  0  0   -13  7 57   11 28 14    53   220   -47  -13 55 46  -12 20 22  -16  3 13  -10 15 49
    143  0  0   -15  6 20   11 27 58    55   220   -45  -15 54 19  -14 18 35  -18  2 13  -12 13 35

    142  0  0   -17  4  5   11 27 42    57   222   -44  -17 52 10  -16 16 15  -20  0 17  -14 10 57
    141  0  0   -19  0 50   11 27 25    59   223   -43  -19 48 56  -18 12 58  -21 57  5  -16  7 35
    140  0  0   -20 56 14   11 27  8    62   224   -42  -21 44 17  -20  8 24  -23 52 15  -18  3  8
    139  0  0   -22 49 57   11 26 51    64   226   -40  -23 37 52  -22  2 14  -25 45 27  -19 57 15
    138  0  0   -24 41 40   11 26 35    66   228   -39  -25 29 23  -23 54  9  -27 36 24  -21 49 39

    137  0  0   -26 31  7   11 26 18    67   230   -38  -27 18 33  -25 43 52  -29 24 50  -23 40  1
    136  0  0   -28 18  3   11 26  1    69   232   -37  -29  5  9  -27 31  8  -31 10 30  -25 28  7
    135  0  0   -30  2 16   11 25 45    71   235   -35  -30 48 58  -29 15 44  -32 53 14  -27 13 41
    134  0  0   -31 43 34   11 25 28    73   238   -34  -32 29 50  -30 57 29  -34 32 52  -28 56 34
    133  0  0   -33 21 51   11 25 12    74   242   -33  -34  7 37  -32 36 15  -36  9 17  -30 36 35

    132  0  0   -34 56 59   11 24 57    76   247   -32  -35 42 13  -34 11 55  -37 42 25  -32 13 36
    131  0  0   -36 28 55   11 24 42    77   252   -30  -37 13 34  -35 44 25  -39 12 13  -33 47 33
    130  0  0   -37 57 36   11 24 27    78   258   -29  -38 41 39  -37 13 41  -40 38 40  -35 18 22
    129  0  0   -39 23  1   11 24 12    79   266   -28  -40  6 27  -38 39 44  -42  1 47  -36 46  0
    128  0  0   -40 45 12   11 23 58    80   274   -27  -41 27 59  -40  2 32  -43 21 35  -38 10 27

Uncertainty in time = +/- 8 secs

Prediction of 2009 Aug 21.0

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