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ASTROMETRIC UPDATE:
OCCULTATION BY (25) PHOCAEA - 2017 JUL 10

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2017 May 19, 18:47 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.

Phocaea Update Map


On 2017 Jul 10 UT, the 75 km diameter asteroid (25) Phocaea will occult a 12.3 mag star in the constellation Vulpecula for observers along a path across western South Australia and north-western West Australia.

In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.16 mag to 10.30 mag (the magnitude of the asteroid) for at most 13.3 seconds. This event will not be observable visually.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.

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 :
 Occultation of 2UCAC 41101818 by 25 Phocaea on 2017 Jul 10 
                  Centre              Star  Star   Sun      Path Limits           Error Limits       Alt
  E. Longitude   Latitude      U.T.    Alt    Az   Alt    Limit 1    Limit 2    Limit 3    Limit 4   Crn
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "
                                                        Longitude  Longitude  Longitude  Longitude
    142 40 35   -45  0  0   18 37 24    10   325   -36  143 15 46  142  5 34  143 35 32  141 46  2   0.02
    141 41 25   -44  0  0   18 37 29    12   326   -37  142 15 44  141  7 15  142 35  1  140 48 10   0.03
    140 44 30   -43  0  0   18 37 34    13   326   -37  141 18  1  140 11  7  141 36 51  139 52 29   0.03
    139 49 40   -42  0  0   18 37 39    14   327   -38  140 22 27  139 17  1  140 40 51  138 58 46   0.03
    138 56 44   -41  0  0   18 37 45    15   327   -39  139 28 49  138 24 45  139 46 50  138  6 54   0.03

    138  5 32   -40  0  0   18 37 52    16   328   -40  138 36 59  137 34 12  138 54 39  137 16 41   0.03
    137 15 58   -39  0  0   18 37 58    18   328   -40  137 46 49  136 45 13  138  4  8  136 28  2   0.04
    136 27 53   -38  0  0   18 38  5    19   329   -41  136 58 10  135 57 41  137 15 10  135 40 48   0.04
    135 41 10   -37  0  0   18 38 13    20   329   -41  136 10 56  135 11 29  136 27 38  134 54 54   0.04
    134 55 44   -36  0  0   18 38 21    21   330   -42  135 25  0  134 26 32  135 41 25  134 10 13   0.04

    134 11 28   -35  0  0   18 38 29    22   330   -43  134 40 17  133 42 44  134 56 26  133 26 41   0.04
    133 28 19   -34  0  0   18 38 38    23   331   -43  133 56 41  133  0  0  134 12 36  132 44 11   0.04
    132 46 10   -33  0  0   18 38 47    25   331   -44  133 14  7  132 18 16  133 29 48  132  2 40   0.04
    132  4 57   -32  0  0   18 38 57    26   331   -44  132 32 32  131 37 26  132 48  0  131 22  3   0.04
    131 24 38   -31  0  0   18 39  6    27   332   -45  131 51 51  130 57 28  132  7  6  130 42 17   0.04

    130 45  7   -30  0  0   18 39 17    28   332   -45  131 11 59  130 18 18  131 27  4  130  3 18   0.04
    130  6 22   -29  0  0   18 39 27    29   332   -46  130 32 55  129 39 52  130 47 48  129 25  2   0.04
    129 28 19   -28  0  0   18 39 38    30   332   -46  129 54 34  129  2  7  130  9 17  128 47 27   0.04
    128 50 56   -27  0  0   18 39 49    31   333   -47  129 16 54  128 25  1  129 31 27  128 10 30   0.04
    128 14  9   -26  0  0   18 40  1    32   333   -47  128 39 51  127 48 30  128 54 15  127 34  9   0.04

    127 37 57   -25  0  0   18 40 13    34   333   -48  128  3 23  127 12 32  128 17 39  126 58 19   0.04
    127  2 16   -24  0  0   18 40 25    35   333   -48  127 27 28  126 37  6  127 41 36  126 23  0   0.04
    126 27  4   -23  0  0   18 40 38    36   334   -48  126 52  3  126  2  7  127  6  3  125 48 10   0.04
    125 52 20   -22  0  0   18 40 51    37   334   -49  126 17  7  125 27 36  126 30 59  125 13 45   0.04
    125 18  1   -21  0  0   18 41  4    38   334   -49  125 42 36  124 53 28  125 56 22  124 39 44   0.04

    124 44  6   -20  0  0   18 41 17    39   334   -49  125  8 29  124 19 44  125 22  9  124  6  6   0.04
    124 10 32   -19  0  0   18 41 31    40   334   -50  124 34 45  123 46 20  124 48 19  123 32 48   0.04
    123 37 18   -18  0  0   18 41 45    41   335   -50  124  1 22  123 13 16  124 14 50  122 59 49   0.04
    123  4 23   -17  0  0   18 42  0    42   335   -50  123 28 17  122 40 29  123 41 41  122 27  7   0.04
    122 31 44   -16  0  0   18 42 15    43   335   -50  122 55 30  122  7 59  123  8 49  121 54 41   0.04

    121 59 20   -15  0  0   18 42 30    45   335   -50  122 22 59  121 35 43  122 36 13  121 22 30   0.04
    121 27 11   -14  0  0   18 42 45    46   335   -50  121 50 42  121  3 41  122  3 53  120 50 31   0.04
    120 55 14   -13  0  0   18 43  0    47   335   -51  121 18 39  120 31 50  121 31 46  120 18 44   0.04
    120 23 28   -12  0  0   18 43 16    48   335   -51  120 46 47  120  0 10  120 59 51  119 47  8   0.04
    119 51 53   -11  0  0   18 43 32    49   335   -51  120 15  6  119 28 40  120 28  6  119 15 40   0.04

Uncertainty in time = +/- 4 secs

Prediction of 2017 May 19.0


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