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ASTROMETRIC UPDATE:
OCCULTATION BY (1182) ILONA - 2013 Aug 12

[Detailed Finder Charts]


Updated:   2013 JUL 04, 00:39 UT

Event Rank : 27

(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.

Ilona Update Map


On 2013 Aug 12 UT, the 18 km diameter asteroid (1182) Ilona will occult a 10.1 mag star in the constellation Scorpius for observers along a somewhat uncertain path across New Zealand passing near Darfield and Nelson.

In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.2 mag (the magnitude of the asteroid) for at most 3.5 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
    173 26 54   -32  0  0    8 52  0    85   242   -37  173 32 39  173 21  9  174  1  3  172 52 45
    173 20 42   -33  0  0    8 51 39    85   253   -37  173 26 31  173 14 53  173 55 14  172 46 10
    173 14 20   -34  0  0    8 51 17    85   267   -37  173 20 13  173  8 27  173 49 16  172 39 24
    173  7 46   -35  0  0    8 50 55    85   283   -37  173 13 43  173  1 49  173 43  8  172 32 25
    173  0 59   -36  0  0    8 50 33    85   298   -36  173  7  1  172 54 58  173 36 47  172 25 11

    172 53 59   -37  0  0    8 50 12    85   311   -36  173  0  5  172 47 52  173 30 15  172 17 43
    172 46 43   -38  0  0    8 49 50    84   321   -36  172 52 54  172 40 32  173 23 28  172  9 57
    172 39 11   -39  0  0    8 49 28    84   329   -35  172 45 28  172 32 55  173 16 28  172  1 54
    172 31 22   -40  0  0    8 49  6    83   335   -35  172 37 44  172 25  0  173  9 11  171 53 32
    172 23 14   -41  0  0    8 48 45    82   340   -35  172 29 42  172 16 46  173  1 37  171 44 50

    172 14 45   -42  0  0    8 48 23    81   344   -34  172 21 19  172  8 11  172 53 45  171 35 45
    172  5 55   -43  0  0    8 48  1    80   347   -34  172 12 35  171 59 15  172 45 33  171 26 16
    171 56 41   -44  0  0    8 47 40    79   349   -34  172  3 28  171 49 54  172 36 59  171 16 22
    171 47  2   -45  0  0    8 47 18    79   351   -33  171 53 56  171 40  8  172 28  2  171  6  0
    171 36 55   -46  0  0    8 46 57    78   353   -33  171 43 57  171 29 53  172 18 40  170 55  9

    171 26 19   -47  0  0    8 46 35    77   354   -32  171 33 29  171 19  9  172  8 51  170 43 45
    171 15 11   -48  0  0    8 46 14    76   356   -32  171 22 29  171  7 53  171 58 33  170 31 47
    171  3 29   -49  0  0    8 45 53    75   357   -32  171 10 56  170 56  1  171 47 44  170 19 11
    170 51  9   -50  0  0    8 45 31    74   358   -31  170 58 45  170 43 32  171 36 20  170  5 55
    170 38  9   -51  0  0    8 45 10    73   359   -31  170 45 55  170 30 22  171 24 19  169 51 55

Uncertainty in time = +/- 8 secs

Prediction of 2013 Jul  4.0

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