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ASTROMETRIC UPDATE:
OCCULTATION BY (568) CHERUSKIA - 2008 OCT 01

[Edwin Goffin's Prediction + Finder Charts]

[Detailed Finder Charts]


Updated:   2008 SEP 26, 02:18 UT

Event Rank : 97

(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.

Cheruskia Update Map


On 2008 Oct 01 UT, the 87 km diameter asteroid (568) Cheruskia will occult a 11.5 mag star in the constellation Pegasus for observers along a wide path across New Zealand, passing over Wellington and near Auckland and Christchurch.

In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.1 mag (the magnitude of the asteroid) for at most 8.1 seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, 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
    174 14 54   -44  0  0   11 43 12    22   338   -42  173 23 56  175  6 26  172 45 34  175 46  0
    174 26 42   -43  0  0   11 43  6    23   338   -43  173 36 26  175 17 31  172 58 35  175 56 32
    174 39 53   -42  0  0   11 43  0    24   338   -44  173 50 16  175 30  3  173 12 54  176  8 34
    174 54 26   -41  0  0   11 42 53    25   337   -45  174  5 25  175 44  0  173 28 30  176 22  2
    175 10 18   -40  0  0   11 42 46    26   337   -46  174 21 50  175 59 19  173 45 20  176 36 55

    175 27 27   -39  0  0   11 42 39    27   336   -47  174 39 29  176 15 57  174  3 22  176 53 10
    175 45 52   -38  0  0   11 42 32    27   336   -48  174 58 22  176 33 53  174 22 35  177 10 45
    176  5 30   -37  0  0   11 42 24    28   335   -49  175 18 25  176 53  6  174 42 58  177 29 38
    176 26 22   -36  0  0   11 42 16    29   335   -50  175 39 39  177 13 35  175  4 29  177 49 49
    176 48 25   -35  0  0   11 42  8    30   334   -51  176  2  3  177 35 18  175 27  9  178 11 16

    177 11 40   -34  0  0   11 42  0    31   334   -52  176 25 36  177 58 14  175 50 55  178 33 59
Uncertainty in time = +/- 3 secs

[Prediction of 2008 Sep 26.0]

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