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ASTROMETRIC UPDATE:
OCCULTATION BY (850) ALTONA - 2008 Mar 06

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2008 FEB 03, 23:30 UT

Event Rank : 69

(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.

Altona Update Map


On 2008 Mar 06 UT, the 81 km diameter asteroid (850) Altona will occult a 8.9 mag star in the constellation Taurus for observers along a path across the south coast of Western Australia, then across central South Australia and northern New South Wales at increasingly low altitude.

In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 15.8 mag (the magnitude of the asteroid) for at most 4.2 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 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
    117 17 35   -36  0  0   12 49 54    25   309   -25  119 21 14  115 23 20  123 22 23  112 25 24
    119 26 52   -35  0  0   12 50  5    24   307   -28  121 41 51  117 24  9  126 15 27  114 15 51
                                                         Latitude   Latitude   Latitude   Latitude
    120  0  0   -34 45 39   12 50  8    24   307   -28  -35 42 41  -33 50 41  -37 25 14  -32 21 23
    121  0  0   -34 20 43   12 50 13    23   306   -29  -35 17  4  -33 26 22  -36 58 13  -31 57 59
    122  0  0   -33 57  6   12 50 18    23   305   -30  -34 52 49  -33  3 20  -36 32 41  -31 35 48

    123  0  0   -33 34 48   12 50 22    22   304   -31  -34 29 55  -32 41 34  -36  8 37  -31 14 51
    124  0  0   -33 13 48   12 50 27    22   303   -32  -34  8 22  -32 21  3  -35 45 58  -30 55  5
    125  0  0   -32 54  5   12 50 31    21   302   -33  -33 48  8  -32  1 48  -35 24 44  -30 36 31
    126  0  0   -32 35 38   12 50 36    21   301   -34  -33 29 13  -31 43 46  -35  4 53  -30 19  8
    127  0  0   -32 18 26   12 50 40    20   300   -34  -33 11 35  -31 26 58  -34 46 25  -30  2 55

    128  0  0   -32  2 29   12 50 44    20   300   -35  -32 55 14  -31 11 22  -34 29 17  -29 47 52
    129  0  0   -31 47 45   12 50 48    19   299   -36  -32 40  9  -30 56 59  -34 13 29  -29 33 58
    130  0  0   -31 34 15   12 50 51    18   298   -37  -32 26 19  -30 43 46  -33 59  0  -29 21 13
    131  0  0   -31 21 57   12 50 55    18   297   -38  -32 13 43  -30 31 45  -33 45 49  -29  9 37
    132  0  0   -31 10 51   12 50 58    17   297   -39  -32  2 21  -30 20 54  -33 33 55  -28 59  8

    133  0  0   -31  0 57   12 51  2    16   296   -39  -31 52 12  -30 11 13  -33 23 18  -28 49 47
    134  0  0   -30 52 14   12 51  5    16   295   -40  -31 43 16  -30  2 42  -33 13 58  -28 41 34
    135  0  0   -30 44 41   12 51  8    15   295   -41  -31 35 33  -29 55 19  -33  5 52  -28 34 27
    136  0  0   -30 38 19   12 51 11    14   294   -42  -31 29  1  -29 49  6  -32 59  2  -28 28 27
    137  0  0   -30 33  7   12 51 14    13   294   -42  -31 23 41  -29 44  1  -32 53 26  -28 23 33

    138  0  0   -30 29  4   12 51 16    13   293   -43  -31 19 31  -29 40  4  -32 49  5  -28 19 45
    139  0  0   -30 26 11   12 51 18    12   292   -44  -31 16 33  -29 37 15  -32 45 57  -28 17  4
    140  0  0   -30 24 27   12 51 21    11   292   -44  -31 14 46  -29 35 34  -32 44  3  -28 15 27
    141  0  0   -30 23 52   12 51 23    10   291   -45  -31 14  9  -29 35  1  -32 43 22  -28 14 57
    142  0  0   -30 24 25   12 51 25     9   291   -45  -31 14 42  -29 35 35  -32 43 55  -28 15 31

    143  0  0   -30 26  7   12 51 26     9   290   -46  -31 16 25  -29 37 16  -32 45 40  -28 17 11
    144  0  0   -30 28 58   12 51 28     8   290   -46  -31 19 18  -29 40  5  -32 48 38  -28 19 57
    145  0  0   -30 32 58   12 51 29     7   289   -47  -31 23 22  -29 44  1  -32 52 49  -28 23 47
    146  0  0   -30 38  6   12 51 31     6   288   -47  -31 28 35  -29 49  4  -32 58 14   .. .. ..
    147  0  0   -30 44 22   12 51 32     5   288   -48  -31 34 59  -29 55 14  -33  4 51   .. .. ..

    148  0  0   -30 51 47   12 51 33     4   287   -48  -31 42 33  -30  2 31  -33 12 41   .. .. ..
    149  0  0   -31  0 21   12 51 34     3   287   -49  -31 51 16  -30 10 56  -33 21 45   .. .. ..
    150  0  0   -31 10  4   12 51 34     3   286   -49  -32  1 11  -30 20 28  -33 32  2   .. .. ..
    151  0  0   -31 20 56   12 51 35     2   286   -49  -32 12 16  -30 31  7  -33 43 33   .. .. ..
    152  0  0   -31 32 56   12 51 35     1   285   -49  -32 24 32  -30 42 55  -33 56 18   .. .. ..


Uncertainty in time = +/- 5 secs

[Prediction of 2008 Feb  3.0]

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