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ASTROMETRIC UPDATE:
OCCULTATION BY (811) NAUHEIMA - 2011 Feb 22

[Detailed Finder Charts]


Updated:   2011 JAN 07, 16:32 UT

Event Rank : 26

(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.

Nauheima Update Map


On 2011 Feb 22 UT, the 24 km diameter asteroid (811) Nauheima will occult a 8.2 mag star in the constellation Gemini for observers along a narrow but quite uncertain path beginning near Grafton and Byron Bay in NSW. The path then moves north-west through Queensland passing near Emerald and Charters Towers.

In the case of an occultation, the combined light of the asteroid and the star will drop by 7.8 mag to 16.0 mag (the magnitude of the asteroid) for at most 16.7 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 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
    166  3 51   -40  3 41   12 46  2    10   311   -40  165 46 29  -40  0 14  166 21 32  -40  7 18  164 19 55  -39 44 16  168  1  9  -40 29 20
    160 47 14   -35 57 58   12 47 48    16   313   -43  160 34 39  -35 56 37  160 59 56  -35 59 23  159 30  2  -35 50 16  162  8 34  -36  7 45
    157 13  5   -32 45 11   12 49 34    20   315   -45  157  2 16  -32 44 35  157 23 57  -32 45 50  156  6 18  -32 41 52  158 22 10  -32 49 46
    154 24 57   -29 58  6   12 51 20    24   316   -47  154 15  7  -29 57 53  154 34 49  -29 58 20  153 24  2  -29 57  8  155 27 25  -29 59 58
    152  3 58   -27 27 10   12 53  5    26   317   -49  151 54 46  -27 27 12  152 13 11  -27 27  9  151  6 55  -27 27 41  153  2 11  -27 27 23

    150  1  9   -25  7 40   12 54 51    29   317   -50  149 52 25  -25  7 53  150  9 54  -25  7 29  149  6 53  -25  9 13  150 56 22  -25  6 45
    148 11 26   -22 56 49   12 56 37    32   317   -51  148  3  3  -22 57  9  148 19 51  -22 56 31  147 19 16  -22 59  7  149  4 24  -22 55  4
    146 31 40   -20 52 49   12 58 22    34   317   -52  146 23 33  -20 53 14  146 39 48  -20 52 24  145 41  8  -20 55 40  147 22 53  -20 50 26
    144 59 42   -18 54 23   13  0  8    36   317   -53  144 51 48  -18 54 53  145  7 37  -18 53 54  144 10 30  -18 57 41  145 49 31  -18 51 31
    143 34  3   -17  0 37   13  1 54    38   317   -54  143 26 20  -17  1 11  143 41 48  -17  0  4  142 45 56  -17  4 17  144 22 44  -16 57 22

    142 13 37   -15 10 49   13  3 39    40   317   -54  142  6  2  -15 11 25  142 21 13  -15 10 13  141 26 23  -15 14 46  143  1 21  -15  7 14
    140 57 33   -13 24 25   13  5 25    42   317   -55  140 50  6  -13 25  4  141  5  1  -13 23 47  140 11  4  -13 28 38  141 44 30  -13 20 34
    139 45 13   -11 41  0   13  7 11    44   316   -56  139 37 52  -11 41 41  139 52 35  -11 40 20  138 59 22  -11 45 25  140 31 30  -11 36 55
    138 36  7   -10  0 12   13  8 57    45   316   -56  138 28 51  -10  0 54  138 43 23  - 9 59 29  137 50 47  -10  4 48  139 21 50  - 9 55 55
    137 29 48   - 8 21 42   13 10 42    47   315   -56  137 22 36  - 8 22 27  137 37  0  - 8 20 58  136 44 55  - 8 26 28  138 15  4  - 8 17 15

Uncertainty in time = +/- 44 secs

Prediction of 2011 Jan  8.0

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