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ASTROMETRIC UPDATE:
OCCULTATION BY (313) CHALDAEA - 2015 Aug 06

[Detailed Finder Charts]


Updated:   2015 JUL 17, 17:09 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.

Chaldaea Update Map


On 2015 Aug 06 UT, the 95 km diameter asteroid (313) Chaldaea will occult a 10.0 mag star in the constellation Aquila for observers along a path over South Australia near Ceduna and Woomera.

In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 13.0 mag (the magnitude of the asteroid) for at most 7.6 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: .

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 Limit1           Path Limit2           Error Limit1          Error Limit2
  E. Longitude    Latitude      U.T.    Alt   Az    Alt                                                                                       
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "
                                                         Longitude  Latitude   Longitude  Latitude   Longitude  Latitude   Longitude  Latitude
    154  1 41   -27 23 50   18 39 29     1   263   -23  ... .. ..   .. .. ..  147 43  3  -27 41 18  ... .. ..   .. .. ..  146  6 55  -27 39 21
    146 35 24   -28 41 26   18 39 37     7   267   -29  150 43 58  -28 39  8  143 53 23  -28 33 49  ... .. ..   .. .. ..  142 45 43  -28 28 30
    143  9 46   -29 31 22   18 39 44    10   268   -32  145 42 26  -29 40 18  141  4 36  -29 19 20  147 16 59  -29 42 41  140  8 43  -29 12 35
    140 31  3   -30 15 56   18 39 52    13   270   -35  142 33 24  -30 28 32  138 44 12  -30  1 37  143 42 51  -30 33 54  137 55  6  -29 53 59
    138 16 34   -30 57 44   18 39 59    15   271   -37  140  2 38  -31 12 23  136 41  6  -30 41 56  141  0 49  -31 19  9  135 56 32  -30 33 42

    136 17 32   -31 37 48   18 40  6    16   272   -38  137 53  7  -31 53 51  134 49 57  -31 20 55  138 44 35  -32  1 29  134  8 38  -31 12 14
    134 29 23   -32 16 40   18 40 14    18   273   -40  135 57 33  -32 33 45  133  7 38  -31 58 57  136 44 29  -32 42  0  132 28 49  -31 49 53
    132 49 25   -32 54 40   18 40 21    19   275   -41  134 12  2  -33 12 34  131 32 12  -32 36 14  134 55 40  -33 21 17  130 55 21  -32 26 52
    131 15 54   -33 31 58   18 40 29    20   276   -42  132 34 10  -33 50 34  130  2 18  -33 12 57  133 15 17  -33 59 40  129 27  3  -33  3 18
    129 47 36   -34  8 46   18 40 36    21   277   -43  131  2 22  -34 27 56  128 36 58  -33 49 13  131 41 29  -34 37 22  128  3  1  -33 39 20

    128 23 37   -34 45  7   18 40 44    22   278   -44  129 35 31  -35  4 49  127 15 27  -34 25  7  130 13  0  -35 14 32  126 42 37  -34 15  1
    127  3 17   -35 21  9   18 40 51    23   279   -45  128 12 47  -35 41 19  125 57 12  -35  0 43  128 48 56  -35 51 17  125 25 18  -34 50 25
    125 46  5   -35 56 55   18 40 59    24   280   -46  126 53 32  -36 17 30  124 41 46  -35 36  5  127 28 33  -36 27 42  124 10 41  -35 25 35
    124 31 34   -36 32 27   18 41  6    25   281   -47  125 37 17  -36 53 27  123 28 47  -36 11 15  126 11 21  -37  3 51  122 58 24  -36  0 35
    123 19 24   -37  7 49   18 41 13    26   282   -48  124 23 38  -37 29 12  122 17 57  -36 46 16  124 56 52  -37 39 48  121 48 11  -36 35 26

Uncertainty in time = +/- 2 secs

Prediction of 2015 Jul 18.0

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