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ASTROMETRIC UPDATE:
OCCULTATION BY (262) VALDA - 2010 APR 18

[Detailed Finder Charts]


Updated:   2010 APR 15, 17:08 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.

Valda Update Map


On 2010 Apr 18 UT, the 15 km diameter asteroid (262) Valda will occult a 9.7 mag star in the constellation Leo for observers along a path across the south island of New Zealand, passing over Timaru.

In the case of an occultation, the combined light of the asteroid and the star will drop by 6.5 mag to 16.2 mag (the magnitude of the asteroid) for at most 1.8 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
    172 36  7   -46  0  0   10  6 49    18   336   -44  172 29  2  172 43 12  171 54 19  173 18  0
    171 46 16   -45  0  0   10  6 44    19   336   -44  171 39 19  171 53 13  171  5 18  172 27 18
    170 57 44   -44  0  0   10  6 38    20   337   -44  170 50 55  171  4 32  170 17 33  171 37 58
    170 10 24   -43  0  0   10  6 32    21   337   -44  170  3 42  170 17  5  169 30 57  170 49 54
    169 24 11   -42  0  0   10  6 26    23   338   -44  169 17 36  169 30 45  168 45 26  170  2 59

    168 38 59   -41  0  0   10  6 20    24   339   -44  168 32 32  168 45 27  168  0 53  169 17  8
    167 54 45   -40  0  0   10  6 13    25   339   -44  167 48 23  168  1  6  167 17 15  168 32 16
    167 11 22   -39  0  0   10  6  6    26   340   -44  167  5  7  167 17 38  166 34 27  167 48 19
    166 28 48   -38  0  0   10  5 59    27   340   -44  166 22 38  166 34 58  165 52 25  167  5 11
    165 46 58   -37  0  0   10  5 51    28   341   -44  165 40 53  165 53  2  165 11  6  166 22 51

    165  5 48   -36  0  0   10  5 44    29   342   -44  164 59 48  165 11 48  164 30 25  165 41 12
    164 25 16   -35  0  0   10  5 36    30   342   -43  164 19 21  164 31 11  163 50 20  165  0 12
    163 45 18   -34  0  0   10  5 27    32   343   -43  163 39 27  163 51  9  163 10 47  164 19 49
    163  5 51   -33  0  0   10  5 18    33   343   -43  163  0  4  163 11 38  162 31 45  163 39 58
    162 26 53   -32  0  0   10  5 10    34   344   -43  162 21 10  162 32 36  161 53  9  163  0 37

    161 48 20   -31  0  0   10  5  0    35   344   -42  161 42 41  161 53 59  161 14 57  162 21 42
    161 10 10   -30  0  0   10  4 51    36   345   -42  161  4 34  161 15 46  160 37  7  161 43 13
    160 32 21   -29  0  0   10  4 41    37   345   -42  160 26 49  160 37 54  159 59 37  161  5  5
    159 54 51   -28  0  0   10  4 31    38   346   -41  159 49 21  160  0 21  159 22 23  160 27 17
    159 17 37   -27  0  0   10  4 21    39   347   -41  159 12  9  159 23  4  158 45 25  159 49 46

    158 40 36   -26  0  0   10  4 10    41   347   -40  158 35 12  158 46  1  158  8 40  159 12 31
    158  3 48   -25  0  0   10  4  0    42   348   -40  157 58 26  158  9 10  157 32  6  158 35 28
    157 27 10   -24  0  0   10  3 49    43   348   -39  157 21 49  157 32 30  156 55 40  157 58 37
    156 50 39   -23  0  0   10  3 37    44   349   -39  156 45 21  156 55 57  156 19 21  157 21 54
    156 14 15   -22  0  0   10  3 26    45   350   -38  156  8 58  156 19 31  155 43  8  156 45 19

    155 37 54   -21  0  0   10  3 14    46   350   -38  155 32 40  155 43  9  155  6 57  156  8 49
    155  1 36   -20  0  0   10  3  2    47   351   -37  154 56 23  155  6 49  154 30 48  155 32 21
    154 25 18   -19  0  0   10  2 50    48   352   -37  154 20  7  154 30 30  153 54 38  154 55 56
    153 48 59   -18  0  0   10  2 37    49   352   -36  153 43 49  153 54 10  153 18 26  154 19 29
Uncertainty in time = +/- 5 secs

Prediction of 2010 Apr 16.0

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