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Updated: 2009 AUG 06, 13:36 UT
Event Rank : 59
(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 2009 Sep 16 UT, the 30 km diameter asteroid (572) Rebekka will occult a 11.4 mag star in the constellation Aquarius for observers along a vn path across Australia from Townsville in Queensland to Adelaide in South Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.5 mag (the magnitude of the asteroid) for at most 3.6 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 Limit1 Path Limit2 Error Limit1 Error Limit2
E. Longitude Latitude U.T. Alt Az Alt
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' "
Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude
150 12 55 -16 53 40 15 14 13 46 288 -66 150 23 20 -16 58 41 150 2 32 -16 48 38 150 45 21 -17 9 15 149 40 53 -16 38 5
149 31 28 -17 47 21 15 14 27 46 289 -66 149 41 54 -17 52 24 149 21 5 -17 42 17 150 3 57 -18 3 1 148 59 26 -17 31 41
148 50 48 -18 41 17 15 14 41 46 290 -65 149 1 15 -18 46 22 148 40 25 -18 36 12 149 23 19 -18 57 2 148 18 43 -18 25 33
148 10 53 -19 35 30 15 14 55 47 292 -65 148 21 21 -19 40 36 148 0 28 -19 30 24 148 43 28 -19 51 20 147 38 44 -19 19 41
147 31 40 -20 30 1 15 15 9 47 293 -65 147 42 9 -20 35 9 147 21 13 -20 24 53 148 4 19 -20 45 57 146 59 25 -20 14 7
146 53 7 -21 24 50 15 15 24 47 294 -65 147 3 38 -21 30 0 146 42 38 -21 19 40 147 25 53 -21 40 52 146 20 46 -21 8 50
146 15 12 -22 20 0 15 15 38 47 296 -65 146 25 46 -22 25 12 146 4 41 -22 14 48 146 48 6 -22 36 7 145 42 45 -22 3 54
145 37 55 -23 15 30 15 15 52 47 297 -64 145 48 31 -23 20 44 145 27 21 -23 10 16 146 10 57 -23 31 44 145 5 19 -22 59 18
145 1 13 -24 11 23 15 16 6 47 298 -64 145 11 53 -24 16 39 144 50 36 -24 6 7 145 34 25 -24 27 44 144 28 27 -23 55 4
144 25 5 -25 7 40 15 16 20 47 300 -63 144 35 49 -25 12 59 144 14 25 -25 2 22 144 58 29 -25 24 9 143 52 9 -24 51 14
143 49 31 -26 4 22 15 16 35 47 301 -63 144 0 18 -26 9 43 143 38 46 -25 59 1 144 23 7 -26 20 58 143 16 22 -25 47 48
143 14 28 -27 1 31 15 16 49 47 302 -62 143 25 19 -27 6 55 143 3 39 -26 56 8 143 48 18 -27 18 16 142 41 6 -26 44 49
142 39 56 -27 59 9 15 17 3 47 304 -62 142 50 52 -28 4 35 142 29 2 -27 53 42 143 14 1 -28 16 2 142 6 19 -27 42 18
142 5 53 -28 57 16 15 17 17 47 305 -61 142 16 55 -29 2 46 141 54 55 -28 51 47 142 40 16 -29 14 19 141 32 1 -28 40 16
141 32 20 -29 55 56 15 17 32 46 307 -60 141 43 28 -30 1 28 141 21 16 -29 50 23 142 7 1 -30 13 8 140 58 10 -29 38 46
140 59 16 -30 55 9 15 17 46 46 308 -59 141 10 30 -31 0 45 140 48 5 -30 49 33 141 34 16 -31 12 32 140 24 46 -30 37 50
140 26 39 -31 54 59 15 18 0 46 309 -59 140 38 0 -32 0 38 140 15 21 -31 49 19 141 2 2 -32 12 32 139 51 48 -31 37 28
139 54 30 -32 55 27 15 18 14 46 310 -58 140 5 58 -33 1 10 139 43 4 -32 49 44 140 30 16 -33 13 12 139 19 16 -32 37 45
139 22 48 -33 56 35 15 18 28 45 312 -57 139 34 24 -34 2 22 139 11 14 -33 50 48 139 59 0 -34 14 33 138 47 9 -33 38 41
138 51 32 -34 58 27 15 18 43 45 313 -56 139 3 18 -35 4 18 138 39 50 -34 52 36 139 28 13 -35 16 38 138 15 27 -34 40 20
138 20 44 -36 1 5 15 18 57 44 314 -55 138 32 40 -36 7 1 138 8 53 -35 55 9 138 57 55 -36 19 30 137 44 10 -35 42 44
137 50 23 -37 4 32 15 19 11 44 316 -54 138 2 29 -37 10 33 137 38 21 -36 58 32 138 28 7 -37 23 12 137 13 17 -36 45 56
137 20 30 -38 8 52 15 19 25 43 317 -54 137 32 48 -38 14 58 137 8 17 -38 2 47 137 58 50 -38 27 48 136 42 50 -37 50 0
136 51 5 -39 14 8 15 19 39 43 318 -53 137 3 35 -39 20 20 136 38 39 -39 7 57 137 30 4 -39 33 22 136 12 47 -38 55 0
136 22 9 -40 20 25 15 19 54 42 319 -52 136 34 53 -40 26 42 136 9 30 -40 14 8 137 1 51 -40 39 57 135 43 11 -40 0 58
135 53 44 -41 27 46 15 20 8 41 320 -51 136 6 42 -41 34 10 135 40 50 -41 21 23 136 34 13 -41 47 38 135 14 1 -41 8 0
Uncertainty in time = +/- 5 secs
Prediction of 2009 Aug 6.0
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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