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Updated: 2018 AUG 12, 17:53 UT
Event Rank : 23
(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.
On 2018 Sep 24 UT, the 12.6 km diameter asteroid (2337) Boubin will occult a 8.9 mag star in the constellation Taurus for observers along a very narrow path across Australia from Coffin Bay across central South Australia and central Queensland to Ingham.
In the case of an occultation, the combined light of the asteroid and the star will drop by 6.96 mag to 15.86 mag (the magnitude of the asteroid) for at most 1.6 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, 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 :Important Note regarding Accuracy:
The uncertainty interval in path widths given above (and shown as a 1-sigma uncertainty ellipse on the plot) refers to RMS deviation and is applied as a +/- range. In other words, a path uncertainty of 1.0 path widths means that the actual center of the asteroid's shadow path should fall within plus or minus 1 path width of the plotted path center. However path errors larger than 1 sigma have been observed so observers should be alert for primary occultations within plus or minus 3 sigma of the updated path.
Further, almost all asteroidal satellites discovered so far have been found within 10 diameters of the asteroid (since this distance is deep enough within the gravitational well to be stable over long timescales). Therefore, if monitoring for secondary events, observing out to about 10 path-widths either side of the predicted track remains worthwhile.
We therefore recommend that you monitor for events if your observing location is up to +/- 10 path-widths from the predicted track. If not monitoring for occultations by secondary bodies you should observe from locations within 3 sigma of the nominal path.
In terms of time, the predictions are now usually accurate to about +/- 0.3 minute so you should be most attentive during the predicted minute of the event. However if intending to catch a potential satellite occultation you should start observing at least 10 times the predicted central duration before the predicted closest approach time for your location, and continue for a similar period afterwards.
Centre Star Star Sun Path Limits Error Limits Alt
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Longitude Longitude Longitude Longitude
132 50 54 -37 0 0 16 34 22 21 37 -47 132 56 15 132 45 32 133 41 40 131 59 47 0.01
133 47 31 -36 0 0 16 34 28 23 37 -47 133 52 46 133 42 16 134 37 17 132 57 27 0.01
134 42 18 -35 0 0 16 34 35 24 36 -47 134 47 27 134 37 9 135 31 7 133 53 12 0.01
135 35 23 -34 0 0 16 34 42 25 36 -48 135 40 26 135 30 20 136 23 19 134 47 12 0.01
136 26 54 -33 0 0 16 34 50 26 35 -48 136 31 51 136 21 56 137 13 59 135 39 33 0.01
137 16 56 -32 0 0 16 34 57 28 35 -48 137 21 48 137 12 3 138 3 15 136 30 23 0.01
138 5 36 -31 0 0 16 35 5 29 34 -48 138 10 24 138 0 47 138 51 11 137 19 47 0.01
138 52 59 -30 0 0 16 35 14 30 34 -48 138 57 43 138 48 15 139 37 54 138 7 53 0.01
139 39 12 -29 0 0 16 35 22 31 33 -48 139 43 51 139 34 32 140 23 28 138 54 44 0.01
140 24 18 -28 0 0 16 35 31 32 33 -49 140 28 53 140 19 41 141 7 58 139 40 27 0.01
141 8 21 -27 0 0 16 35 40 34 32 -49 141 12 54 141 3 49 141 51 28 140 25 5 0.01
141 51 27 -26 0 0 16 35 49 35 32 -49 141 55 56 141 46 58 142 34 2 141 8 44 0.01
142 33 39 -25 0 0 16 35 59 36 32 -49 142 38 5 142 29 13 143 15 44 141 51 26 0.01
143 15 0 -24 0 0 16 36 9 37 31 -49 143 19 23 143 10 37 143 56 37 142 33 15 0.01
143 55 34 -23 0 0 16 36 19 38 31 -49 143 59 54 143 51 14 144 36 45 143 14 16 0.01
144 35 24 -22 0 0 16 36 29 40 31 -49 144 39 42 144 31 7 145 16 11 143 54 32 0.01
145 14 34 -21 0 0 16 36 40 41 31 -48 145 18 49 145 10 19 145 54 57 144 34 4 0.01
145 53 5 -20 0 0 16 36 50 42 30 -48 145 57 18 145 48 52 146 33 7 145 12 57 0.01
146 31 0 -19 0 0 16 37 1 43 30 -48 146 35 11 146 26 50 147 10 43 145 51 13 0.01
147 8 23 -18 0 0 16 37 13 44 30 -48 147 12 32 147 4 15 147 47 47 146 28 55 0.01
147 45 16 -17 0 0 16 37 24 46 29 -48 147 49 22 147 41 9 148 24 22 147 6 5 0.01
148 21 40 -16 0 0 16 37 36 47 29 -47 148 25 45 148 17 35 149 0 30 147 42 46 0.02
148 57 38 -15 0 0 16 37 48 48 29 -47 149 1 42 148 53 34 149 36 13 148 18 59 0.02
149 33 12 -14 0 0 16 38 0 49 29 -47 149 37 15 149 29 10 150 11 34 148 54 48 0.02
150 8 25 -13 0 0 16 38 12 50 28 -46 150 12 26 150 4 24 150 46 34 149 30 13 0.02
150 43 18 -12 0 0 16 38 25 51 28 -46 150 47 18 150 39 19 151 21 16 150 5 18 0.02
151 17 54 -11 0 0 16 38 37 53 28 -46 151 21 52 151 13 55 151 55 41 150 40 4 0.02
151 52 13 -10 0 0 16 38 50 54 28 -45 151 56 10 151 48 15 152 29 51 151 14 33 0.02
152 26 18 - 9 0 0 16 39 3 55 28 -45 152 30 15 152 22 22 153 3 48 151 48 47 0.02
153 0 11 - 8 0 0 16 39 16 56 27 -44 153 4 7 152 56 15 153 37 34 152 22 47 0.02
153 33 54 - 7 0 0 16 39 30 57 27 -44 153 37 49 153 29 58 154 11 10 152 56 36 0.02
154 7 27 - 6 0 0 16 39 44 58 27 -44 154 11 22 154 3 33 154 44 38 153 30 16 0.02
154 40 54 - 5 0 0 16 39 57 60 27 -43 154 44 48 154 37 0 155 18 0 154 3 47 0.02
155 14 15 - 4 0 0 16 40 11 61 26 -43 155 18 9 155 10 21 155 51 18 154 37 11 0.02
Uncertainty in time = +/- 12 secs
Prediction of 2018 Aug 12.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
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