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Updated: 2010 SEP 03, 23:07 UT
Event Rank : 72
(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 2010 Oct 21 UT, the 60 km diameter asteroid (1712) Angola will occult a 10.7 mag star in the constellation Andromeda for observers along a path across Queensland and South Australia, passing over Cardwell, Birdsville and Ceduna.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 14.8 mag (the magnitude of the asteroid) for at most 3.8 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 :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
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
131 2 57 -37 0 0 15 21 48 28 342 -42 130 26 52 131 39 20 129 29 4 132 39 0
131 37 47 -36 0 0 15 21 42 29 341 -43 131 1 52 132 14 1 130 4 19 133 13 25
132 13 53 -35 0 0 15 21 36 30 340 -44 131 38 5 132 49 59 130 40 46 133 49 12
132 51 16 -34 0 0 15 21 30 30 339 -45 132 15 34 133 27 17 131 18 24 134 26 23
133 29 58 -33 0 0 15 21 23 31 339 -46 132 54 20 134 5 56 131 57 16 135 4 57
134 10 2 -32 0 0 15 21 16 32 338 -47 133 34 25 134 45 59 132 37 24 135 44 59
134 51 28 -31 0 0 15 21 9 32 337 -47 134 15 51 135 27 26 133 18 50 136 26 30
135 34 21 -30 0 0 15 21 2 33 336 -48 134 58 40 136 10 22 134 1 36 137 9 33
136 18 42 -29 0 0 15 20 55 34 335 -49 135 42 56 136 54 50 134 45 45 137 54 11
137 4 36 -28 0 0 15 20 47 34 334 -50 136 28 43 137 40 52 135 31 20 138 40 29
137 52 7 -27 0 0 15 20 39 35 333 -51 137 16 3 138 28 34 136 18 26 139 28 30
138 41 18 -26 0 0 15 20 31 36 332 -51 138 5 2 139 17 59 137 7 5 140 18 20
139 32 16 -25 0 0 15 20 23 36 331 -52 138 55 44 140 9 14 137 57 23 141 10 6
140 25 6 -24 0 0 15 20 15 37 329 -53 139 48 15 141 2 25 138 49 26 142 3 52
141 19 55 -23 0 0 15 20 6 37 328 -53 140 42 41 141 57 38 139 43 18 142 59 47
142 16 51 -22 0 0 15 19 57 37 327 -54 141 39 10 142 55 2 140 39 8 143 58 1
143 16 2 -21 0 0 15 19 48 38 325 -54 142 37 51 143 54 46 141 37 2 144 58 42
144 17 39 -20 0 0 15 19 38 38 324 -55 143 38 52 144 57 1 142 37 10 146 2 3
145 21 54 -19 0 0 15 19 28 38 323 -55 144 42 26 146 1 59 143 39 42 147 8 19
146 29 1 -18 0 0 15 19 18 38 321 -55 145 48 45 147 9 56 144 44 50 148 17 45
147 39 15 -17 0 0 15 19 8 38 320 -55 146 58 4 148 21 9 145 52 47 149 30 42
Uncertainty in time = +/- 4 secs
Prediction of 2010 Sep 3.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
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