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ASTROMETRIC UPDATE:
OCCULTATION BY (141) LUMEN - 2008 JUL 30

[Detailed Finder Charts]


Updated:   2008 JUL 22, 18:29 UT

Event Rank : 99

(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.

Lumen Update Map


On 2008 Jul 30 UT, the 120 km diameter asteroid (141) Lumen will occult a 13.1 mag star in the constellation Pisces for observers along a path across western New Zealand.

In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.4 mag to 12.3 mag (the magnitude of the asteroid) for at most 6.8 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
    171 33 35   -47  0  0   17 33 57    22     1   -24  172 41 22  170 26 17  173 20 54  169 47 28
    172  8 32   -46  0  0   17 34  0    23     1   -24  173 15 19  171  2 14  173 54 17  170 23 59
    172 43 44   -45  0  0   17 34  4    24     0   -24  173 49 35  171 38 21  174 28  1  171  0 38
    173 19 11   -44  0  0   17 34  8    25   359   -23  174 24 11  172 14 41  175  2  7  171 37 28
    173 54 56   -43  0  0   17 34 12    26   359   -23  174 59  8  172 51 14  175 36 35  172 14 30

    174 31  0   -42  0  0   17 34 16    27   358   -22  175 34 26  173 28  3  176 11 28  172 51 45
    175  7 23   -41  0  0   17 34 20    28   357   -21  176 10  8  174  5  8  176 46 46  173 29 14
    175 44  8   -40  0  0   17 34 25    29   357   -21  176 46 15  174 42 31  177 22 31  174  7  0
    176 21 16   -39  0  0   17 34 29    30   356   -20  177 22 47  175 20 14  177 58 43  174 45  4
    176 58 47   -38  0  0   17 34 34    31   355   -20  177 59 47  175 58 18  178 35 24  175 23 27

    177 36 45   -37  0  0   17 34 39    32   355   -19  178 37 15  176 36 45  179 12 35  176  2 11
Uncertainty in time = +/- 2 secs

[Prediction of 2008 Jul 22.0]

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