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ASTROMETRIC UPDATE:
OCCULTATION BY (895) HELIO - 2005 OCT 07

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2005 SEP 26, 15:52 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.

Helio Update Map


On 2005 Oct 07 UT, the 142 km diameter asteroid (895) Helio will occult a 11.7 mag star in the constellation Pegasus for observers along a path passing over the far north-western corner of Western Australia.

In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.6 mag (the magnitude of the asteroid) for at most 13.8 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  '  "
                                                        Longitude  Longitude  Longitude  Longitude
    110 58 50   -34  0  0   11 43 22    31    22   -13  110  8 54  111 48 38  109 38 52  112 18 26
    111 28  5   -33  0  0   11 43 16    32    21   -14  110 38 47  112 17 14  110  9  9  112 46 39
    111 56 41   -32  0  0   11 43 10    33    21   -14  111  8  1  112 45 14  110 38 45  113 14 18
    112 24 42   -31  0  0   11 43  4    35    21   -15  111 36 37  113 12 40  111  7 42  113 41 24
    112 52 10   -30  0  0   11 42 57    36    21   -16  112  4 38  113 39 35  111 36  3  114  8  0

    113 19  7   -29  0  0   11 42 50    37    20   -16  112 32  6  114  6  1  112  3 50  114 34  7
    113 45 34   -28  0  0   11 42 43    38    20   -17  112 59  3  114 32  0  112 31  5  114 59 48
    114 11 35   -27  0  0   11 42 36    39    20   -18  113 25 32  114 57 32  112 57 51  115 25  5
    114 37 10   -26  0  0   11 42 29    40    20   -18  113 51 33  115 22 41  113 24  8  115 49 58
    115  2 21   -25  0  0   11 42 22    41    20   -19  114 17 10  115 47 28  113 50  0  116 14 30

    115 27 10   -24  0  0   11 42 14    42    20   -19  114 42 22  116 11 54  114 15 27  116 38 42
    115 51 39   -23  0  0   11 42  6    43    19   -20  115  7 13  116 36  0  114 40 31  117  2 35
    116 15 48   -22  0  0   11 41 58    44    19   -21  115 31 43  116 59 48  115  5 14  117 26 11
    116 39 39   -21  0  0   11 41 51    45    19   -21  115 55 54  117 23 20  115 29 37  117 49 31
    117  3 13   -20  0  0   11 41 42    46    19   -22  116 19 47  117 46 35  115 53 41  118 12 36

    117 26 31   -19  0  0   11 41 34    47    19   -22  116 43 23  118  9 37  116 17 28  118 35 27
    117 49 35   -18  0  0   11 41 26    48    19   -23  117  6 43  118 32 25  116 40 58  118 58  5
    118 12 26   -17  0  0   11 41 17    49    19   -23  117 29 49  118 55  0  117  4 13  119 20 32
    118 35  4   -16  0  0   11 41  9    50    19   -24  117 52 41  119 17 24  117 27 14  119 42 47
    118 57 31   -15  0  0   11 41  0    51    19   -25  118 15 21  119 39 38  117 50  3  120  4 53

    119 19 47   -14  0  0   11 40 51    52    18   -25  118 37 50  120  1 42  118 12 39  120 26 50
    119 41 54   -13  0  0   11 40 42    54    18   -26  119  0  8  120 23 38  118 35  3  120 48 39
    120  3 52   -12  0  0   11 40 33    55    18   -26  119 22 16  120 45 25  118 57 18  121 10 21
    120 25 42   -11  0  0   11 40 23    56    18   -27  119 44 16  121  7  6  119 19 24  121 31 56
    120 47 25   -10  0  0   11 40 14    57    18   -27  120  6  7  121 28 41  119 41 20  121 53 26



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