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ASTROMETRIC UPDATE:
OCCULTATION BY (31) EUPHROSYNE - 2017 OCT 25

[Detailed Finder Charts]


Updated:   2017 Sep 14, 22:02 UT

Event Rank : 100

(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.

Euphrosyne Update Map


On 2017 Oct 25 UT, the 280 km diameter asteroid (31) Euphrosyne will occult a 12.2 mag star in the constellation Auriga for observers along a very wide path across Northern Territory.

In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.37 mag to 11.20 mag (the magnitude of the asteroid) for at most 17.5 seconds. This event will be very difficult to observe visually.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.

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 :
 Occultation of UCAC4-689-044786 by 31 Euphrosyne on 2017 Oct 25 
                   Centre              Star  Star   Sun     Path Limit1           Path Limit2           Error Limit1          Error Limit2       Alt
  E. Longitude    Latitude      U.T.    Alt   Az    Alt                                                                                          Crn
      o  '  "     o  '  "    h  m  s     o     o     o    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "    o  '  "
                                                         Longitude  Latitude   Longitude  Latitude   Longitude  Latitude   Longitude  Latitude
    131 12 24   -15 41 33   16 14 32    12    32   -56  128 40 53  -17 19 17  133 22 20  -14 32 18  128 13 18  -17 39 14  133 41 50  -14 22 58   ....
    133 28 19   -11  6 23   16 14 42    17    32   -59  131 29 21  -12  1 34  135 18 51  -10 22 47  131  9 19  -12 11 45  135 35 55  -10 16 41  -0.37
Uncertainty in time = +/- 2 secs

Prediction of 2017 Sep 14.0


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