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Updated: 2006 MAY 23, 00:47 UT
Event Rank : 99
(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 2006 Jun 29 UT, the 326 km diameter asteroid (511) Davida will occult a 9.9 mag star in the constellation Capricornus for observers along a path beginning near Brisbane shortly before local sunrise, then running down the New South Wales coast. including over Sydney area, with gradually darker background sky conditions as the shadow makes its way south, ending over Tasmania before local twilight.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 11.8 mag (the magnitude of the asteroid) for as long as 29.5 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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
152 54 35 -35 30 14 20 37 3 35 266 -5 156 4 18 -35 38 46 149 57 11 -35 16 21 157 8 0 -35 40 10 149 2 41 -35 10 56
152 27 5 -36 26 23 20 37 12 35 266 -5 155 37 38 -36 35 38 149 28 44 -36 11 49 156 41 35 -36 37 18 148 33 57 -36 6 11
152 0 46 -37 22 20 20 37 22 36 267 -6 155 12 24 -37 32 17 149 1 19 -37 7 7 156 16 39 -37 34 11 148 6 10 -37 1 18
151 35 38 -38 18 8 20 37 31 36 268 -7 154 48 33 -38 28 44 148 34 54 -38 2 19 155 53 12 -38 30 51 147 39 20 -37 56 18
151 11 40 -39 13 50 20 37 40 36 269 -7 154 26 4 -39 25 2 148 9 27 -38 57 26 155 31 12 -39 27 21 147 13 26 -38 51 14
150 48 51 -40 9 26 20 37 50 37 270 -8 154 4 58 -40 21 12 147 44 58 -39 52 29 155 10 38 -40 23 42 146 48 26 -39 46 6
150 27 10 -41 4 58 20 37 59 37 271 -9 153 45 13 -41 17 15 147 21 27 -40 47 30 154 51 32 -41 19 55 146 24 21 -40 40 57
150 6 39 -42 0 28 20 38 9 37 272 -9 153 26 52 -42 13 15 146 58 54 -41 42 30 154 33 53 -42 16 4 146 1 11 -41 35 48
149 47 18 -42 55 58 20 38 18 37 273 -10 153 9 54 -43 9 11 146 37 19 -42 37 31 154 17 43 -43 12 9 145 38 54 -42 30 39
149 29 8 -43 51 28 20 38 28 37 274 -10 152 54 22 -44 5 7 146 16 42 -43 32 34 154 3 3 -44 8 12 145 17 33 -43 25 33
149 12 11 -44 47 0 20 38 37 37 274 -11 152 40 17 -45 1 2 145 57 5 -44 27 41 153 49 57 -45 4 14 144 57 8 -44 20 31
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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