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Updated: 2016 AUG 09, 01:08 UT
Event Rank : 83
(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 2016 Sep 23 UT, the 89 km diameter asteroid (326) Tamara will occult a 8.8 mag star in the constellation Indus for observers along a path across north-eastern Australia, from northern Brisbane along but a little inland from the Queensland coast, to Weipa.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.98 mag to 12.70 mag (the magnitude of the asteroid) for at most 6.5 seconds.
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.
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
137 22 34 - 2 0 0 15 48 37 22 216 -73 138 9 29 136 36 38 138 57 28 135 51 38 -1.61
137 30 15 - 3 0 0 15 48 31 23 216 -73 138 17 21 136 44 10 139 5 31 135 59 0 -1.61
137 39 42 - 4 0 0 15 48 25 24 216 -73 138 27 2 136 53 23 139 15 27 136 8 2 -1.61
137 50 56 - 5 0 0 15 48 19 24 216 -72 138 38 33 137 4 22 139 27 17 136 18 45 -1.61
138 4 1 - 6 0 0 15 48 12 25 217 -72 138 51 58 137 17 6 139 41 5 136 31 11 -1.61
138 18 57 - 7 0 0 15 48 6 26 217 -71 139 7 20 137 31 40 139 56 53 136 45 23 -1.61
138 35 50 - 8 0 0 15 47 59 26 217 -71 139 24 41 137 48 6 140 14 45 137 1 24 -1.61
138 54 42 - 9 0 0 15 47 52 27 218 -70 139 44 6 138 6 27 140 34 46 137 19 16 -1.61
139 15 39 -10 0 0 15 47 44 28 218 -69 140 5 41 138 26 48 140 57 1 137 39 5 -1.61
139 38 45 -11 0 0 15 47 37 28 219 -68 140 29 30 138 49 15 141 21 37 138 0 54 -1.61
140 4 7 -12 0 0 15 47 29 29 219 -68 140 55 40 139 13 51 141 48 40 138 24 48 -1.61
140 31 51 -13 0 0 15 47 21 29 220 -67 141 24 20 139 40 45 142 18 20 138 50 55 -1.61
141 2 7 -14 0 0 15 47 13 30 220 -66 141 55 39 140 10 4 142 50 47 139 19 20 -1.61
Latitude Latitude Latitude Latitude
142 0 0 -15 42 16 15 46 58 30 221 -64 -14 7 57 -17 9 2 -12 23 34 -18 29 51 -1.60
143 0 0 -17 14 54 15 46 44 31 222 -62 -15 49 11 -18 34 50 -14 16 8 -19 50 3 -1.60
144 0 0 -18 37 0 15 46 31 31 222 -61 -17 17 45 -19 51 38 -15 52 48 -21 2 23 -1.60
145 0 0 -19 50 38 15 46 19 32 223 -59 -18 36 25 -21 1 0 -17 17 36 -22 8 5 -1.60
146 0 0 -20 57 11 15 46 8 32 223 -58 -19 47 4 -22 4 3 -18 33 5 -23 8 5 -1.60
147 0 0 -21 57 44 15 45 57 32 224 -57 -20 50 59 -23 1 39 -19 40 56 -24 3 6 -1.60
148 0 0 -22 53 3 15 45 46 32 224 -55 -21 49 8 -23 54 28 -20 42 20 -24 53 41 -1.60
149 0 0 -23 43 45 15 45 36 32 225 -54 -22 42 15 -24 43 1 -21 38 12 -25 40 17 -1.60
150 0 0 -24 30 20 15 45 27 32 225 -53 -23 30 55 -25 27 44 -22 29 13 -26 23 18 -1.60
151 0 0 -25 13 12 15 45 18 32 225 -52 -24 15 35 -26 8 57 -23 15 54 -27 3 2 -1.60
152 0 0 -25 52 39 15 45 9 32 226 -51 -24 56 38 -26 46 58 -23 58 43 -27 39 44 -1.60
153 0 0 -26 29 0 15 45 1 31 226 -50 -25 34 23 -27 22 2 -24 38 0 -28 13 37 -1.60
154 0 0 -27 2 27 15 44 52 31 226 -49 -26 9 4 -27 54 21 -25 14 3 -28 44 54 -1.60
155 0 0 -27 33 13 15 44 44 31 226 -48 -26 40 56 -28 24 7 -25 47 6 -29 13 43 -1.60
156 0 0 -28 1 28 15 44 37 31 226 -47 -27 10 9 -28 51 27 -26 17 23 -29 40 14 -1.60
157 0 0 -28 27 20 15 44 29 30 226 -46 -27 36 53 -29 16 31 -26 45 3 -30 4 33 -1.60
158 0 0 -28 50 57 15 44 22 30 226 -45 -28 1 16 -29 39 26 -27 10 15 -30 26 48 -1.60
159 0 0 -29 12 25 15 44 15 30 226 -44 -28 23 25 -30 0 16 -27 33 9 -30 47 3 -1.60
-163 0 0 .. .. .. .. .. .. .. .. .. .. .. .. -19 46 2 .. .. .. .. .. .. ....
Uncertainty in time = +/- 3 secs
Prediction of 2016 Aug 9.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
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[Asteroid Occultation Results]
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